Journal articles: 'Alkali metal silicate'

1

Krumrine, Paul H., Michael Lefenfeld, and Gregory A. Romney. "Alkali Metal Silicides: A New Material for Heavy-Oil Production Processes." SPE Journal 21, no. 01 (2016): 22–31. http://dx.doi.org/10.2118/169490-pa.

Full text

Abstract:

Summary Alkali-metal silicides are a new class of materials that provide thermal, chemical, and immiscible gas-drive benefits in one treatment. Not previously known in oilfield applications, these materials are energy-dense chemicals that generate heat, hydrogen, and an alkali silicate after reaction with reservoir water. The reaction is only limited by the availability of water in any form; in a closed environment, one can generate pressures &gt;10,000 psi (&gt;68.9 MPa). One can disperse alkali-metal silicides in various hydrocarbon fluids to facilitate placement deep in the reservoir, or one can coat them to allow a time-delayed reaction. One can mill the powders to submicron size for optimum injectivity in high-permeability reservoirs or zones. This combination of reaction-product properties makes silicides particularly applicable for the recovery of heavier crude oils. Because the chemical reaction occurs in situ, silicides are not subject to the thermal-inefficiency limitations of conventional thermal-enhanced-oil-recovery processes at depth. Further, the resulting hydrogen and silicate reaction products represent a “green” chemistry approach that may reduce the environmental impact of oil-recovery operations. This paper discusses the potential impacts of heat, hydrogen, and alkali generated from alkali-metal silicide and presents bench-scale high-permeability unconsolidated-sandpack linear-flood results demonstrating recovery efficiencies up to 93% of original oil in place (residual oil saturation = 0.058). Results also show that alkali-metal silicides can provide accelerated oil production, as much as 20% faster than comparable chemical technologies.

APA, Harvard, Vancouver, ISO, and other styles

2

Liang, Jian-Jie, Alexandra Navrotsky, Thomas Ludwig, Hans J. Seifert, and Fritz Aldinger. "Enthalpy of Formation of Rare-earth Silicates Y2SiO5 and Yb2SiO5 and N-containing Silicate Y10(SiO4)6N2." Journal of Materials Research 14, no. 4 (1999): 1181–85. http://dx.doi.org/10.1557/jmr.1999.0158.

Full text

Abstract:

The enthalpies of formation of two rare-earth silicates (Y2SiO5 and Yb2SiO5) and a N-containing rare-earth silicate Y10(SiO4)6N2 have been determined using high-temperature drop solution calorimetry. Alkali borate (52 wt% LiBO2·48 wt% NaBO2) solvent was used at 800 °C, and oxygen gas was bubbled through the melt. The nitrogen-containing silicate was oxidized during dissolution. The standard enthalpies of formation are for Y2SiO5, Yb2SiO5, and Y10(SiO4)6N2, respectively, –22868.54 ± 5.34, –22774.75 ± 8.21, and –14145.20 ± 16.48 kJ/mol from elements, and –52.53 ± 4.83, –49.45 6 ± 8.35, and –94.53 ± 11.66 kJ/mol from oxides (Y2O3 or Yb2O3, SiO2) and nitride (Si3N4). The silicates and N-containing silicate are energetically stable with respect to binary oxides and Si3N4, but the N-containing silicate may be metastable with respect to assemblages containing Y2SiO5, Si3N4, and SiO2. A linear relationship was found between the enthalpy of formation of a series of M2SiO5 silicates from binary oxides and the ionic potential (z/r) of the metal cation.

APA, Harvard, Vancouver, ISO, and other styles

3

Matos, Israel R. Montoya. "Influence of Alkali Metal Ions on the Structural and Spectroscopic Properties of Sm3+-Doped Silicate Glasses." Ceramics 6, no. 3 (2023): 1788–98. http://dx.doi.org/10.3390/ceramics6030109.

Full text

Abstract:

In the present work, the influence of alkali ions (Li, Na, K) on the structural and spectroscopic properties of silica glasses doped with Sm3+ was investigated. Infrared and Raman spectroscopy techniques were used to investigate the structural properties of the alkali silicate glasses. The optical absorption showed bands characteristic of Sm3+ ions in alkali silicate glasses, and this was investigated. The Judd–Ofelt theory was applied to evaluate the phenomenological intensity parameters (Ω2, Ω4, and Ω6) of the optical absorption measurements. The multi-channel visible and near infrared emission transitions originating from the 4G5/2-emitting state of the Sm3+ in alkali silicate glasses with a maximum phonon energy of ~1050 cm−1 were investigated. From the evaluated Judd–Ofelt parameters, radiative parameters such as spontaneous emission probabilities, radiative lifetimes, branching ratios, and stimulated emission cross-sections were calculated. The recorded luminescence spectra regions revealed intense green, orange, red, and near-infrared emission bands, providing new traces for developing tunable laser and optoelectronic devices.

APA, Harvard, Vancouver, ISO, and other styles

4

Salguero, Tina T., Darrah Johnson-McDaniel, Christopher A. Barrett, Asma Sharafi, Richard Weimar, and Terra Blevins. "Nanoscience of Metal Silicate-Based Pigments." MRS Proceedings 1618 (2014): 161–66. http://dx.doi.org/10.1557/opl.2014.465.

Full text

Abstract:

ABSTRACTThe colored component of several important ancient pigments, including Egyptian blue and Han blue, are based on alkali earth copper tetrasilicate materials. In recent work, we have found that these layered materials can be chemically exfoliated into their constituent monolayers to provide alkali earth copper tetrasilicate nanosheets—defined by nanometer thickness and lateral dimensions that are on the order of several microns. The facile exfoliation of these materials into nanosheets is especially surprising in view of their long history on artifacts under a variety of environmental conditions, and we have examined the issue of whether archaeological samples are affected by this exfoliation mechanism. We have characterized the properties of these nanosheets by an array of analytical techniques, including powder x-ray diffraction, photoluminescence measurements, and Raman spectroscopy. In all cases, we observe differences between nanosheet and bulk samples that originate from the loss of coupling between layers when going from three-dimensional to two- dimensional structures. Both CaCuSi4O10 nanosheets (derived from Egyptian blue) and BaCuSi4O10 nanosheets (derived from Han blue) have strong near-infrared luminescence properties like their bulk counterparts, yet they are amenable to modern solution processing methods. We have demonstrated ink jet printing with CaCuSi4O10 nanosheet inks, as well as the fabrication of nanosheet-based papers. Potential applications for these materials include NIR-based biomedical imaging and security inks.

APA, Harvard, Vancouver, ISO, and other styles

5

Kudina, Elena F., Natalia S. Vinidiktova, Vladeta Jevremović, and Radovan Nikolić. "Development of Coatings Based on Modified Epoxide Binder for Metal Surface Protection." Applied Mechanics and Materials 806 (November 2015): 135–40. http://dx.doi.org/10.4028/www.scientific.net/amm.806.135.

Full text

Abstract:

Epoxy-silicate modifiers were obtained by a sol-gel procedure from the alkali-silicate solutions and their effect on physico-mechanical properties of the coatings based on the binary epoxide binder were investigated. It is shown that pretreatment of the metal surface effects strength of adhesive bonding with the epoxide coating.

APA, Harvard, Vancouver, ISO, and other styles

6

Zheng, Jian, Le Huang, Panpeng Wei, et al. "Molecular Insights into Adsorption and Diffusion Mechanism of N-Hexane in MFI Zeolites with Different Si-to-Al Ratios and Counterions." Catalysts 12, no. 2 (2022): 144. http://dx.doi.org/10.3390/catal12020144.

Full text

Abstract:

The effect of the silicon to aluminum ratio (SAR) and alkali metal cations on adsorption and diffusion properties of ZSM-5 and silicate-1 zeolites was investigated using n-hexane as the model probe via giant canonical Monte Carlo (GCMC) and molecular dynamics (MD) simulations. A wide range of SAR was considered in this study to explore the possible adsorption sites in the zeolites. The findings show that, at 298 K and 423 K, adsorption and diffusion of n-hexane on/in low SAR (≤50) H-ZSM-5 models were promoted due to the preferable distribution of n-hexane in straight channels and enhanced interaction between protons and n-hexane molecules (about 24 kcal·mol−1). In alkali metal cation (i.e., Na+ and K+) exchanged ZSM-5, the alkali metal cations affected transport of molecules, which led to significant differences in their adsorption and diffusion properties compared to HZSM-5. In the Na+ and K+ systems, lower saturated adsorption capacities were predicted compared to that of silicate-1, which could be attributed to the decrease in effective void size posed by alkali–metal cations. In addition, simulation results also suggested that the T9 and T3 are the most likely sites for n-hexane adsorption, followed by T2, T5, and T10. Findings of the work can be beneficial to the rational design of high-performance zeolite catalysts for n-hexane conversion.

APA, Harvard, Vancouver, ISO, and other styles

7

Jiang, Xintai, Fenglin Lu, Jiantao Ju, Wenke Guo, and Jian Zu. "The Influence of Alkali Metals on the Sintering Mineralization Process of Iron Ore." Materials 18, no. 2 (2025): 227. https://doi.org/10.3390/ma18020227.

Full text

Abstract:

To investigate the influence of alkali metal compounds in different forms on the sintering mineralization process of iron ore, the basic sintering characteristics of iron ore with alkali metal contents ranging from 0 to 4% were measured using the micro-sintering method, and the influence mechanism was analyzed using thermodynamic analysis and first-principles calculations. The results showed that (1) the addition of KCl/NaCl increased the lowest assimilation temperature (LAT) and the index of liquid-phase fluidity (ILF), while that of K2CO3/Na2CO3 decreased the LAT but increased the ILF of iron ore. (2) The pores formed by the volatilization of KCl/NaCl suppressed the diffusion of Fe3+ and Ca2+, which inhibited the formation of silico-ferrite of calcium and aluminum (SFCA). The addition of K2CO3/Na2CO3 promoted the formation of a silicate liquid phase with better fluidity, intervening in the solid-phase reaction between iron ore and CaO. (3) The alkali metal compounds in different forms concentrated in silicate but showed lower levels of distribution in iron-bearing minerals in the form of a solid solution. Furthermore, the formation of an alkali metal-bearing solid solution decreased the microhardness of minerals. This decrease in microhardness and in the content of the SFCA bonding phase directly contributed to the decrease in the compressive strength of the sinter.

APA, Harvard, Vancouver, ISO, and other styles

8

Glenn, Michael, Jessica A. Allen, and Scott W. Donne. "Silicate Formation in a Ternary Alkali Metal Carbonate Melt." Energy & Fuels 33, no. 11 (2019): 12008–15. http://dx.doi.org/10.1021/acs.energyfuels.9b02356.

Full text

APA, Harvard, Vancouver, ISO, and other styles

9

Brykov, A. S., and V. I. Korneev. "Production and usage of powdered alkali metal silicate hydrates." Metallurgist 52, no. 11-12 (2008): 648–52. http://dx.doi.org/10.1007/s11015-009-9108-5.

Full text

APA, Harvard, Vancouver, ISO, and other styles

10

P V, Gokul, Megha S Murali, Mekha M Sivan, Nijo J Zachariah, and Joshua Jathin Vaz. "An Experimental Study on Performance of Two-Part Geopolymer Concrete Using Natural Binders and Activators." E3S Web of Conferences 529 (2024): 01007. http://dx.doi.org/10.1051/e3sconf/202452901007.

Full text

Abstract:

The study investigates the characteristics of geopolymer concrete, employing sodium silicate and sodium hydroxide as activators instead of cement. In conventional construction practices, binders like fly ash, ground granulated blast furnace slag (GGBS) are commonly combined with alkali solutions. The manufacturing process of geopolymer relies on various alkaline activators. In this research, GGBS is replaced with sodium hydroxide and sodium silicate as activators. GGBS is recognized for its ability to enhance the workability and strength of geopolymer concrete, exhibiting favorable mechanical properties, resistance to chemicals, minimal shrinkage, environmental friendliness and exceptional durability. Furthermore, there are still certain drawbacks to geopolymer concrete, such as the fact that alkaline solutions are difficult to handle and apply because they are viscous, corrosive, difficult to transport, as well as challenging to store in huge quantities. A two part geopolymer concrete consists of two main components. An activator solution and a binder solution. The activator solution typically contains alkali metal hydroxides or silicates, while the binder solution contains aluminosilicate material such as fly ash or metakaolin. When mixed together, these solutions undergo a chemical reaction that forms a solid and durable geopolymer material.

APA, Harvard, Vancouver, ISO, and other styles

11

Tikhomirova, I. N., A. V. Belyakov, A. I. Zakharov, and A. V. Makarov. "Degree of Silicic Acid Polymerization in Alkali-Metal Silicate Solutions." Glass and Ceramics 74, no. 5-6 (2017): 220–23. http://dx.doi.org/10.1007/s10717-017-9966-4.

Full text

APA, Harvard, Vancouver, ISO, and other styles

12

Bochkareva, E. S., A. I. Sidorov, A. I. Ignat’ev, N. V. Nikonorov, and O. A. Podsvirov. "Formation of alkali-metal nanoparticles in alkali-silicate glasses under electron irradiation and thermal processing." Technical Physics 62, no. 2 (2017): 270–75. http://dx.doi.org/10.1134/s1063784217020037.

Full text

APA, Harvard, Vancouver, ISO, and other styles

13

Kinrade, Stephen D., Kirk Marat, and Christopher T. G. Knight. "Longitudinal29Si Nuclear Magnetic Relaxation in Aqueous Alkali-Metal Silicate Solutions Revisited." Journal of Physical Chemistry 100, no. 47 (1996): 18351–56. http://dx.doi.org/10.1021/jp9618845.

Full text

APA, Harvard, Vancouver, ISO, and other styles

14

Lang, Natacha, and Alain Tuel. "Alkali-containing mesoporous (alumino) silicate materials with very high metal loading." Microporous and Mesoporous Materials 77, no. 2-3 (2005): 147–57. http://dx.doi.org/10.1016/j.micromeso.2004.08.026.

Full text

APA, Harvard, Vancouver, ISO, and other styles

15

Knight, Christopher T. G., Raymond J. Balec, and Stephen D. Kinrade. "Aqueous Alkali-Metal Silicate Anions Containing Fully Condensed Four-Coordinate Sites." Angewandte Chemie 124, no. 39 (2012): 10038–41. http://dx.doi.org/10.1002/ange.201205606.

Full text

APA, Harvard, Vancouver, ISO, and other styles

16

Knight, Christopher T. G., Raymond J. Balec, and Stephen D. Kinrade. "Aqueous Alkali-Metal Silicate Anions Containing Fully Condensed Four-Coordinate Sites." Angewandte Chemie International Edition 51, no. 39 (2012): 9900–9903. http://dx.doi.org/10.1002/anie.201205606.

Full text

APA, Harvard, Vancouver, ISO, and other styles

17

Gamidov, R. G., E. A. Teymurova, Y. I. Jafarov, et al. "DEVELOPMENT OF AMMONIA-ALKALINE METHOD OF COMPLEX PROCESSING OF ALUNITE ORE." Azerbaijan Chemical Journal, no. 1 (March 28, 2023): 122–28. http://dx.doi.org/10.32737/0005-2531-2023-1-122-128.

Full text

Abstract:

The results of research in the field of development of complex processing of alunite ore from the Zaglig deposit of Azerbaijan are presented. An ammonia-alkaline ore processing method is proposed, which provides for the extraction of alkali metal sulfates (K2SO4, Na2SO4) at the beginning of the technological process during the leaching of alunite ore. To recover alkali metal sulfates from dehydrated ore to ammonia processing, the dehydration product is leached with a slightly alkaline (0.5% NaOH) solution. After extraction of alkali sulfates from the ore, the solid insoluble residue is subjected to ammonia leaching. In this case, only ammonium sulfate passes into the solution, which is used as a fertilizer. Thus, the separation of alkali metal sulfates from the ore at the beginning of processing improves the conditions for subsequent hydrochemical processes. the following average values of the degrees of extraction of alkali metals and aluminum into the solution from leaching were determined, (%): Na+ = 90.93; K+ = 96.42; Al+3 = 0.055. Aluminum oxide, which is part of alunite, remains in the sediment under optimal leaching conditions. Aluminum oxide, which is not part of the alum part of alunite, that is, associated with silicate in kaolinite, is also not extracted and remains in the undissolved precipitate

APA, Harvard, Vancouver, ISO, and other styles

18

Gao, Minglei, Xiangxin Xue, Lanjie Li, He Yang, and Donghui Chen. "Leaching behavior and kinetics of vanadium extraction from vanadium-bearing steel slag." Metallurgical Research & Technology 116, no. 4 (2019): 407. http://dx.doi.org/10.1051/metal/2018129.

Full text

Abstract:

The vanadium-bearing steel slag as solid waste is also one of valuable vanadium-containing resource. Recovering vanadium from the refractory steel slag is a great challenge in the world. A leaching process study using high concentration sodium hydroxide solution was proposed in this laboratory work. The effects of sodium hydroxide concentration, particle size, leaching temperature and the ratio of alkali to slag on the rate of vanadium leaching were determined and the leaching kinetics was presented. It indicates that the leaching rate is highly sensitive to the sodium hydroxide concentration and leaching temperature and increases with increasing temperature and sodium hydroxide concentration. By studying the reaction mechanisms, it was found that the dicalcium silicate, tricalcium silicate and calcium ferrited which co-exist with calcium vanadate in the vanadium-bearing steel slag were gradually exposed and reacted with NaOH media to form Na3VO4. The leaching kinetics was analyzed which indicated that the leaching rate is controlled by the chemical reaction with the apparent activation energy of 51.34 kJ/mol. On the basis of this process, the vanadium can be effectively extracted with a leaching rate of more than 80%. The leaching medium can be recycled. It is an effective and cleaner process for leaching vanadium.

APA, Harvard, Vancouver, ISO, and other styles

19

Kovalenko, A. S., N. A. Yaroshenko, V. V. Strelko, and V. G. Ilyin. "Self-assembly of Fibres in Alkylcarboxylate—Sodium Silicate Systems." Adsorption Science & Technology 20, no. 4 (2002): 433–40. http://dx.doi.org/10.1260/02636170260295597.

Full text

Abstract:

Fibres of macroscopic size (up to 5 cm in length) formed spontaneously in initially homogeneous systems containing alkali metal salts of saturated n-alkylcarboxylic acids and sodium silicate. After drying, these fibres resembled wool or down, with some being in the form of dense strands which laminated into single fibres with time. The minimal thickness of these single fibres was ca. 0.5 mm and, since a dense parallel cluster contained ca. 34 000 micellar strands, the thickness of each fibre plus associated silicate surface layer amounted to ca. 27 Å. It was suggested that the key feature of the self-assembly mechanism is the weak interaction between a surfactant molecule and a silicate leading to the continuous formation of microscopic sized fibres.

APA, Harvard, Vancouver, ISO, and other styles

20

Muis, Lince, Edwin Permana, and Hasrul Anwar. "Aplikasi Zeolite dari Cangkang Kelapa Sawit Pada Penyerapan Logam Kromium Heksavalen (Cr6+) Heksavalen Pada Industri Elektroplating." Jurnal Daur Lingkungan 2, no. 1 (2019): 1. http://dx.doi.org/10.33087/daurling.v2i1.16.

Full text

Abstract:

Zeolite is a hydrated alumino-silicate compound having a main element which consists of alkali and alkaline-earth cations, especially Ca, K and Na, with a general formula (LmAlx Sig O2nH2O) where L is a metal. Zeolite can be synthesized from a sample containing silica and alumina. The compounds contain alkali hydroxide or organic bases. Palm kernel shells are one of the industrial wastes containing many minerals such as SiO2 58.02%; Al2O3 8.7%. The source of silica and alumina in oil palm shells is used as a base for making zeolites using the hydrothermal method in a reactor. Fine samples of palm shells were melted with NaOH at 500 °nn C for 1 hour and diluted to produce sodium silicate reactants. Making sodium aluminate reactant is done by dissolving NaOH in distilled water and then heating and adding Al(OH)3 to NaOH solution with stirring. Making zeolite is done by mixing sodium silicate and sodium aluminate reactants and the zeolite crystallization process is carried out using a hydrothermal reactor heated in the oven by varying the hydroternal temperature of 1200C, 150 ° C and 1800C for 8 hours. The synthesized zeolite was characterized using XRF, FTIR and SEM EDX.

APA, Harvard, Vancouver, ISO, and other styles

21

Huang, Chengde, and A. N. Cormack. "Structure and energetics in mixed-alkali-metal silicate glasses from molecular dynamics." Journal of Materials Chemistry 2, no. 3 (1992): 281. http://dx.doi.org/10.1039/jm9920200281.

Full text

APA, Harvard, Vancouver, ISO, and other styles

22

Kinrade, Stephen D., and David L. Pole. "Effect of alkali-metal cations on the chemistry of aqueous silicate solutions." Inorganic Chemistry 31, no. 22 (1992): 4558–63. http://dx.doi.org/10.1021/ic00048a023.

Full text

APA, Harvard, Vancouver, ISO, and other styles

23

Sithole, Thandiwe, Nelson Tsotetsi, and Tebogo Mashifana. "Synthesis of Ambient Cured GGBFS Based Alkali Activated Binder Using a Sole Alkaline Activator: A Feasibility Study." Applied Sciences 11, no. 13 (2021): 5887. http://dx.doi.org/10.3390/app11135887.

Full text

Abstract:

Utilisation of industrial waste-based material to develop a novel binding material as an alternative to Ordinary Portland Cement (OPC) has attracted growing attention recently to reduce or eliminate the environmental footprint associated with OPC. This paper presents an experimental study on the synthesis and evaluation of alkali activated Ground granulated blast furnace slag (GGBFS) composite using a NaOH solution as an alkaline activator without addition of silicate solution. Different NaOH concentrations were used to produce varied GGBFS based alkali activated composites that were evaluated for Uncofined Compressive Strength (UCS), durability, leachability, and microstructural performance. Alkali activated GGBFS composite prepared with 15 M NaOH solution at 15% L/S ratio achieved a UCS of 61.43 MPa cured for 90 days at ambient temperatures. The microstructural results revealed the formation of zeolites, with dense and non-porous morphology. Alkali activated GGBFS based composites can be synthesized using a sole alkaline activator with potential to reduce CO2 emission. The metal leaching tests revealed that there are no potential environmental pollution threats posed by the synthesized alkali activated GGBFS composites for long-term use.

APA, Harvard, Vancouver, ISO, and other styles

24

Cirstea, Nicoleta Florentina, Alina Badanoiu, and Aurelian Cristian Boscornea. "Intumescent Silicate Coatings with the Addition of Alkali-Activated Materials." Polymers 14, no. 10 (2022): 1937. http://dx.doi.org/10.3390/polym14101937.

Full text

Abstract:

Fireproof inorganic coatings based on sodium silicate solution with intumescent additions were prepared and tested to assess their ability to limit the negative effect of a fire. The intumescent materials were obtained by the alkali activation of waste glass powder (obtained by the grinding of recycled soda-lime culet) and slag (waste resulting from the metallurgical industry). The replacement of talc (used as filler in paint formulation) with the intumescent materials obtained by the alkaline activation of waste glass powder (WGP), determined an increase in the intumescence coefficient (up to 65%) and decreased the activation temperature of this process. To evaluate these coatings’ abilities to prevent or delay the temperature increase in metal structures, the paints were applied on steel plates and tested in direct contact with the flame of a butane burner for 60 min. The coatings prevented the increase in the steel substrate temperature over one considered critical (500°C) for steel mechanical properties; the combination of two coatings, with different intumescence activation temperatures, correlated with the increase in the coating’s thickness, sensibly reduced the rate of temperature increase (up to 75%) in the steel substrate.

APA, Harvard, Vancouver, ISO, and other styles

25

EL-KORASHY, S. A. "Cation Exchange of Alkali Metal Hydroxides with Some Hydrothermally Synthesized Calcium Silicate Compounds." Journal of Ion Exchange 15, no. 1 (2004): 2–9. http://dx.doi.org/10.5182/jaie.15.2.

Full text

APA, Harvard, Vancouver, ISO, and other styles

26

Kamada, Kai, Shuichi Yamashita, and Yasumichi Matsumoto. "Electrochemical design of metal distribution in alkali silicate glass with ion-conducting microelectrodes." Journal of Materials Chemistry 13, no. 6 (2003): 1265. http://dx.doi.org/10.1039/b302215c.

Full text

APA, Harvard, Vancouver, ISO, and other styles

27

McCormick, A. V., A. T. Bell, and C. J. Radke. "Evidence from alkali-metal NMR spectroscopy for ion pairing in alkaline silicate solutions." Journal of Physical Chemistry 93, no. 5 (1989): 1733–37. http://dx.doi.org/10.1021/j100342a013.

Full text

APA, Harvard, Vancouver, ISO, and other styles

28

Hidayat, Kukuh, Agus Wahyudi, and Husaini Husaini. "Making a synthetic zeolite from a residue of bauxite washing." Indonesian Mining Journal 23, no. 2 (2020): 99–104. http://dx.doi.org/10.30556/imj.vol23.no2.2020.1112.

Full text

Abstract:

A zeolite synthetic of NaA type is generally prepared by mixing the alumina and silicate-containing materials (alkali alumino hydro-silicates). The used raw materials include the amorphous solids such as metakaolin, siliceous earth, coal ash, kimberlite waste, alumina trihydrate [Al(OH)3], bauxite, and aluminum metal. Residue of bauxite washing retains a fine texture and contains significant alumina and silica content, namely 30-36% Al2O3 and 10-15% SiO2. Both components are required for making the zeolite NaA . In this research, the zeolite NaA was made by extracting the alumina from residue of bauxite washing with caustic soda, and followed by reacting it with a water glass after through the flushing and washing process. The composition of zeolite NaA is as follows: 33.87% SiO2, 27.63% Al2O3, 16.31% Na2O, and 22.18% H2O with Na96Al96Si96O384.216H2O or Na12(AlO2)12(SiO2)12.27H2O as its mineral composition.

APA, Harvard, Vancouver, ISO, and other styles

29

Puspasari, Vinda, Andrie Harmaji, Eva Febrina, Clara Alverina, and Bintoro Siswayanti. "Geopolymer for medical application: a review." Physics and Chemistry of Solid State 25, no. 3 (2024): 626–38. http://dx.doi.org/10.15330/pcss.25.3.626-638.

Full text

Abstract:

The materials for medical application are normally consisted of metal, ceramic, and polymer. Each material has its own limitations such as corrosion in metal, the brittleness of ceramic, and the high temperature problem of polymer. To eliminate their weakness, combining one or more respective materials are encouraged, which termed as composite. One of the emerging composite materials that can be utilized in medical application are geopolymer, which is an inorganic polymer material consisted of aluminosilicate sources such as metakaolin and sol-gel synthesized material and alkali activator consisted of strong alkali hydroxide and sodium silicate solution. This review paper elaborated the raw materials, alkali activators, and admixture for geopolymer, and the application of geopolymer-based material for medical purposes. We also discuss the prospective and challenges of geopolymer for the medical field. The adjustable strength and porosity make this material versatile for coating substrates to become bone scaffold material. However, the concern remains about the leaching and high alkalinity of geopolymers. This could be improved by reducing the molarity of sodium hydroxide and mixing geopolymer with compounds to trap the harmful leachate agent inside and studying different solutions for the activation of geopolymer.

APA, Harvard, Vancouver, ISO, and other styles

30

Shapovalov, Yu B., A. R. Kotelnikov, I. N. Suk, V. S. Korzhinskaya, and Z. A. Kotelnikova. "Liquid immiscibility and problems of ore genesis (according to experimental data)." Петрология 27, no. 5 (2019): 577–97. http://dx.doi.org/10.31857/s0869-5903275577-597.

Full text

Abstract:

The results of an experimental study of phase relations and distribution of elements in silicate melt–salt systems (carbonate, phosphate, fluoride, chloride) melt, silicate melt I–silicate melt II, and also in fluid – magmatic systems in the presence of alkali metal fluorides are presented. Salt extraction of a number of ore elements (Y, REE, Sr, Ba, Ti, Nb, Zr, Ta, W, Mo, Pb) was studied in liquid immiscibility processes in a wide temperature range of 800–1250°С and pressure of 1–5.5 kbar. It is shown that the partition coefficients are sufficient for the concentration of ore elements in the quantity necessary for the genesis of ore deposits. In the fluid-saturated melt of trachyrhyolite, the separation into two silicate liquids has been determined. The partition coefficients of a number of elements (Sr, La, Nb, Fe, Cr, Mo, K, Rb, Cs) between phases L1 and L2 has been obtained. The interaction processes of a heterophase fluid in the granite (quartz)–ore mineral–heterophase fluid (Li, Na, K-fluoride) system were studied at 650–850°C and P = 1 kbar. The formation of the phase of a highly alkaline fluid–saturated silicate melt – Ta and Nb concentrator is shown as a result of the reaction of the fluid with the rock and ore minerals.

APA, Harvard, Vancouver, ISO, and other styles

31

Jia, Jinsheng, Yang Zhang, Xian Zhang, et al. "Changes of Alkali Metal Ions and Alkaline Earth Metal Ions on The Surface of Lead Silicate Glasses." IOP Conference Series: Materials Science and Engineering 612 (October 19, 2019): 032109. http://dx.doi.org/10.1088/1757-899x/612/3/032109.

Full text

APA, Harvard, Vancouver, ISO, and other styles

32

Skorina, Taisiya, and Irina Tikhomirova. "Alkali silicate binders: effect of SiO2/Na2O ratio and alkali metal ion type on the structure and mechanical properties." Journal of Materials Science 47, no. 12 (2012): 5050–59. http://dx.doi.org/10.1007/s10853-012-6382-6.

Full text

APA, Harvard, Vancouver, ISO, and other styles

33

Kinrade, Stephen D., and Thomas W. Swaddle. "Mechanisms of longitudinal silicon-29 nuclear magnetic relaxation in aqueous alkali-metal silicate solutions." Journal of the American Chemical Society 108, no. 23 (1986): 7159–62. http://dx.doi.org/10.1021/ja00283a004.

Full text

APA, Harvard, Vancouver, ISO, and other styles

34

Clearfield, A., L. N. Bortun, and A. I. Bortun. "Alkali metal ion exchange by the framework titanium silicate M2Ti2O3SiO4·nH2O (M=H, Na)." Reactive and Functional Polymers 43, no. 1-2 (2000): 85–95. http://dx.doi.org/10.1016/s1381-5148(99)00005-x.

Full text

APA, Harvard, Vancouver, ISO, and other styles

35

KINRADE, S. D., and D. L. POLE. "ChemInform Abstract: Effect of Alkali-Metal Cations on the Chemistry of Aqueous Silicate Solutions." ChemInform 24, no. 4 (2010): no. http://dx.doi.org/10.1002/chin.199304010.

Full text

APA, Harvard, Vancouver, ISO, and other styles

36

Miao, Zhaohong, Yun Yang, Zhonglei Wei, Zhihua Yang, Tushagu Abudouwufu, and Shilie Pan. "A new barium-containing alkali metal silicate fluoride NaBa3Si2O7F with deep-UV optical property." Science China Materials 62, no. 10 (2019): 1454–62. http://dx.doi.org/10.1007/s40843-019-9448-y.

Full text

APA, Harvard, Vancouver, ISO, and other styles

37

Sreeja, R., P. V. Prabhakaran, Sushant K. Manwatkar, and S. Packirisamy. "Adhesive Joining of Metal to Metal and Metal to Ceramic by Ceramic Precursor Route." Materials Science Forum 710 (January 2012): 656–61. http://dx.doi.org/10.4028/www.scientific.net/msf.710.656.

Full text

Abstract:

Inorganic ceramic adhesives (geopolymers) based on aluminosilicate matrix are versatile candidates for bonding metals to metals or metals to ceramics. On curing, they result in an amorphous, crosslinked, impervious, acid resistant 3D-structures. Alkali activated aluminosilicate based ceramic adhesive was developed for bonding metals to ceramics and metal to metal, for high temperature applications. The bonding is achieved at 175°C for 3 hrs, by solid state reaction of alkaline solution of allkalisilicate precursor with the refractory filler, contributing to the bulk aluminosilicate matrix. Lap shear strength of 2-4 MPa was obtained for bonding stainless steel. The XRD patterns show the amorphous nature of the aluminosilicate matrix, with mullite formation at higher temperatures. Thermogravimetric analysis shows that the weight loss is only due to the removal of water from the system by means of evaporation and polycondensation of Si-OH groups and Al-OH groups. This is followed by structural reorganisation in which aluminium ions are incorporated into the silicate chains forming the Si-O-Al network resulting in the bonding with the metallic surface. The system can withstand the maximum operational temperatures of the substrates and can be used for bonding different metallic or ceramic, joints/interfaces for RLV-TD/TSTO.

APA, Harvard, Vancouver, ISO, and other styles

38

Tadić, Milena, Miljan Bigović, Dijana Djurović, Martina Jakić, and Irena Nikolić. "Simultaneous Removal of Cu2+, Zn2+ and Cd2+ from Aqueous Solutions by Alkali Activated Slag." Periodica Polytechnica Chemical Engineering 65, no. 3 (2021): 389–99. http://dx.doi.org/10.3311/ppch.17619.

Full text

Abstract:

Electric Arc Furnace (EAF) slag containing larnite, gehlenite, wuestite, montcellite and calcite as the main crystal phases was alkali activated using the alkali activator prepared by the mixing of two solutions, sodium silicate and NaOH. Alkali Activated (AA) slag based on EAF slag is used as an adsorbent for Cu2+,Cd2+ and Zn2+ from aquatic solutions performing the batch adsorption test at the range temperature between 20 and 45 °C. AA slag sample is characterized by XRPD, FTIR and SEM/EDS analysis and the results indicate crystalline-amorphous structure of AA slag that contains Calcium Aluminate Silicate Hydrate (C-A-S-H) phase. Concentration of Cu2+, Cd2+ and Zn2+ in aqueous solution was determined using Inductively Coupled Plasma Optical Emission Spectrometry (ICP-OES). The results obtained indicate that, in a multicomponent system of three dissolved ions, AA slag shows highest affinity towards the Cu2+. The order of the metal ion adsorption onto AA slag was: Cu2+, Cd2+ and Zn2+. The highest adsorption of Cu2+ is attributed to the highest electronegativity and lowest hydrated ionic radii of cation in comparison to Cd2+ and Zn2+. Pseudo-first-order and pseudo-second-order kinetics models, Langmuir and Freundlich isotherm models were applied in order to investigate the adsorption process. The results have shown that data better fitted the pseudo-second kinetic and Langmuir isotherm models The investigation of mechanism of adsorption indicate that both film diffusion and intra-particle diffusion have occurred during the adsorption process. The thermodynamics parameters of adsorption process indicate the spontaneous and endothermic character of heavy metals adsorption on the AA slag.

APA, Harvard, Vancouver, ISO, and other styles

39

Bell, Anthony M. T., and Alex H. Stone. "Crystal structures and X-ray powder diffraction data for Cs₂NiSi₅O₁₂, RbGaSi₂O₆, and CsGaSi₂O₆ synthetic leucite analogues." Powder Diffraction 36, no. 4 (2021): 273–81. http://dx.doi.org/10.1017/s0885715621000580.

Full text

Abstract:

Leucites are tetrahedrally coordinated silicate framework structures with some of the silicon framework cations partially replaced by divalent or trivalent cations. These structures have general formulae A2BSi5O12 and ACSi2O6; where A is a monovalent alkali metal cation, B is a divalent cation, and C is a trivalent cation. In this paper, we report the Rietveld refinements of three more synthetic leucite analogues with stoichiometries of Cs2NiSi5O12, RbGaSi2O6, and CsGaSi2O6. Cs2NiSi5O12 is Ia$\bar{3}$d cubic and is isostructural with Cs2CuSi5O12. RbGaSi2O6 is I41/a tetragonal and is isostructural with KGaSi2O6. CsGaSi2O6 is $I\bar{4}3d$ cubic and is isostructural with RbBSi2O6.

APA, Harvard, Vancouver, ISO, and other styles

40

Wu, Hao, Yali Feng, Heng Zhang, and Haoran Li. "The process of vanadium migration and silicon extraction by alkaline leaching from high silicon stone coal under reduction conditions." Metallurgical Research & Technology 116, no. 3 (2019): 313. http://dx.doi.org/10.1051/metal/2018101.

Full text

Abstract:

It is difficult to utilize stone coal with a vanadium grade of below 0.7%. With the aim of effectively utilizing the silicon and vanadium in stone coal, the vanadium concentration and silicon extraction processes by alkaline leaching under reducing conditions were investigated. The effect of NaOH mass fraction, temperature and the amount of hydrazine hydrate on the leaching process was researched. Moreover, the laws of phase transformation and the migration process of vanadium were revealed. The results show that the dissolution of quartz resulted in the exposure of muscovite and goldmanite, but the phase of muscovite and goldmanite was not damaged. Under the optimal operation conditions (25% mass fraction of NaOH, liquid-solid ratio 2:1 at 200 °C for 4 hours), 90.14% of silicon was removed. At the same time, the modulus of sodium silicate product reached 1.88 and the content of V2O5 enriched from 0.5% to 2.51%. In addition, V(IV) was partially reduced to V(III) by adding hydrazine hydrate in an amount of 10% by mass. V(IV) migrated from the liquid phase to the alkali leaching slag, and the recovery of vanadium increased from 89.48% to 94.43%. All the obtained results suggest an efficient process for separation and extraction of vanadium and silicon.

APA, Harvard, Vancouver, ISO, and other styles

41

Sieber, John R., Elizabeth A. Mackey, Anthony F. Marlow, Rick Paul, and Ryan Martin. "Validation of an alkali reaction, borate fusion, X-ray fluorescence method for silicon metal." Powder Diffraction 22, no. 2 (2007): 146–51. http://dx.doi.org/10.1154/1.2737464.

Full text

Abstract:

The value assignment of candidate Standard Reference Material (SRM®) 57b Silicon Metal provided an opportunity to develop an alkali reaction procedure as a precursor to borate fusion for the preparation of test specimens from the metal powder for X-ray fluorescence spectrometry (XRF). Suggested for this purpose by Blanchette in a 2002 Advances in X-ray Analysis article [45, 415–420 (2002)], the alkali reaction uses LiOH∙H2O to convert Si to Li2SiO3. Lithium silicate is fused with lithium borate flux without damage to platinum ware. Once specimens are fused and cast as beads, calibration standards are prepared to closely match the compositions of the specimens, allowing a linear calibration for each analyte. The XRF method yields results that are directly traceable to the mole through NIST SRM spectrometric solutions. The method was validated in two ways. First, the reaction was used on older SRMs for Si metal: SRM 57 and SRM 57a. Second, XRF results for candidate SRM 57b were compared to results obtained using prompt gamma-ray activation analysis (PGAA) and inductively coupled plasma optical emission spectrometry (ICPOES). Bias tests show the XRF results are accurate for the elements Al, S, Ca, Ti, Cr, Mn, Ni, Cu, and Zr. Levels of S, Ca, Cr, and Cu in candidate SRM 57b are near the limits of quantification of the borate fusion method. Iron results may be subject to a low bias. Phosphorus is not quantitatively retained during the alkali reaction and borate fusion. These elements, plus B, which cannot be determined after borate fusion, are listed in manufacturing specifications for Si metal.

APA, Harvard, Vancouver, ISO, and other styles

42

Derevenko, V. V., and K. K. Davydov. "Study of sorption processes for corn oil refining." IOP Conference Series: Earth and Environmental Science 1052, no. 1 (2022): 012086. http://dx.doi.org/10.1088/1755-1315/1052/1/012086.

Full text

Abstract:

Abstract Studies have summarized and analyzed the structure of an aqueous sodium silicate solution, which showed their dual nature. On the one hand, they exhibit the properties of electrolytes, and on the other hand, they contain monomeric alkali metal cations and polymeric silicon-oxygen anions. The use of an aqueous solution of sodium metasilicate with a silicate modulus equal to 1, in which polyanions predominate, is substantiated for the process of chemisorption purification of unrefined corn oil. A comparative analysis of the methods of purification of unrefined and hydrated vegetable oils pretreated in an electromagnetic field with solutions of organic acids and sodium silicate is carried out. Obviously, when purifying unrefined corn oil with an aqueous solution of sodium silicate, there is a complex mechanism of the sorption process with various groups of polar accompanying substances, complicated by chemical interactions. On the basis of planned experimental studies, adequate experimental-statistical models were obtained for calculating the soap content in the resulting corn oil and its yield, depending on the studied process parameters. It was found that in the studied range of temperatures and parameters of an aqueous solution of sodium silicate, corn oil is obtained according to the acid number corresponding to the Russian National Standard for refined corn oil. The optimal parameters of the chemisorption purification process in terms of temperature, concentration and dosage of sodium silicate with a silicate modulus equal to 1 are experimentally substantiated when the Reynolds criterion of the mixer is changed in the studied range from 4000 to 12000, ensuring the production of corn oil corresponding to the accepted quality parameters.

APA, Harvard, Vancouver, ISO, and other styles

43

Veiga, Fabiane Paschoal da, William Mateus Kubiaki Levandoski, Giovani Jordi Bruschi, et al. "Utilizing Iron Ore Tailings for the Development of a Sustainable Alkali-Activated Binder." Mining 5, no. 2 (2025): 26. https://doi.org/10.3390/mining5020026.

Full text

Abstract:

The increasing production of iron ore has led to the accumulation of iron ore tailings (IOTs), which pose significant environmental and safety risks when stored in tailings dams. This study investigates the potential of IOTs as a precursor in alkali-activated binder systems, aiming to provide a sustainable solution for mining waste management. Industrial calcium carbide lime and sodium silicate (Na2SiO3) were used as activators in varying concentrations (Na2SiO3: 10%, 15%, 20%, 25%, and 30%; carbide lime: 5%, 7.5%, and 10%), with curing conditions of 23 °C for 7 days. Techniques including unconfined compressive strength tests, X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), and metal leaching tests were employed to evaluate the mechanical performance and environmental safety of the alkali-activated binders. The results reveal that a mixture containing 20% Na2SiO3 and 10% carbide lime achieved the highest compressive strength of 0.33 MPa at 7 days. The binder also showed negligible metal leaching, meeting environmental safety standards. These findings confirm the viability of using IOTs in the development of durable, eco-friendly construction materials, offering a scalable and sustainable solution for the management of mining waste and promoting circular economy principles in the construction sector.

APA, Harvard, Vancouver, ISO, and other styles

44

Okabe, Kiyomi, Kenji Matsuzaki, and Hiroyuki Hagiwara. "Hydrothermal Synthesis of Calcium Silicate of ZSM-5 Structure in Alkali-Metal-Cation-Free Conditions." Bulletin of the Chemical Society of Japan 63, no. 5 (1990): 1552–54. http://dx.doi.org/10.1246/bcsj.63.1552.

Full text

APA, Harvard, Vancouver, ISO, and other styles

45

Dobosh, A. Yu, I. A. Sokolov, and N. N. Khimich. "Mixed-Alkali Effect in Glasses of Different Classes in the Framework of a Microinhomogeneous-Glass-Structure Model." Èlektrohimiâ 60, no. 6 (2024): 415–29. http://dx.doi.org/10.31857/s0424857024060044.

Full text

Abstract:

By example of the silicate glasses with the compositions (33.3 – x) Li2O · xNa2O · 66.7SiO2 and (33.3 – x) K2O · xNa2O · 66.7SiO2 with purely cationic conductance and chalcogenide glasses (Ag–Cu)0.33AsSe1.5 and (Ag–Cu)0.61AsSe1.5 with mixed ionic-electronic conductance, consideration has been given to the describing of the mixed-alkali effect in bimetallic glasses in the framework of a microinhomogeneous-glassstructure model using additive schemes involving concentration dependences of conductivity of monometallic glasses with the monovalent metal content equal to that in the mixed glass. A satisfactory agreement between experimental and calculated data is demonstrated. Herein, in the alkaline silicate glasses the nonlinear variation of the conductivity parameters is connected with the migration of two alkaline cations and sequential replacement of the conductance mainly involving an ion by that involving another ion. In the studied chalcogenide glasses, a similar varying of electrical parameters is connected with the replacement of the majority current carrier upon the equivalent substituting of copper for silver in the glass bulk: the mixed, predominantly ionic conductance is replaced by purely electronic one.

APA, Harvard, Vancouver, ISO, and other styles

46

Lavrov, R. V., N. V. Kuvardin, and S. Narmatov. "Physical and Chemical Activation of Quartz Raw Materials with Sodium Hydroxide in the Ratio of the Eutectic Composition in the Na2O – SiO2 System." Proceedings of the Southwest State University. Series: Engineering and Technology 13, no. 4 (2024): 152–62. http://dx.doi.org/10.21869/2223-1528-2023-13-4-152-162.

Full text

Abstract:

The purpose of this work was to continue research on the activation of quartz raw materials using alkali metal hydroxides. This paper presents a theoretical justification and practical confirmation of the physical and chemical activation of quartz raw materials by sodium hydroxide, taking into account the eutectic ratios in the Na2O–SiO2 system.Methods. Quartz glass sand VS-030-B was chosen as a source of quartz raw materials; as a sodium-containing raw material flake sodium hydroxide brand TR. For the scientific basis, the phase diagram of Na2O-SiO2 of Berezhny was used. To study the phase composition of activated quartz sand, X-ray phase analysis was used; to study a particle of the activation product of quartz sand and sodium hydroxide, scanning electron microscopy was used. To confirm the effectiveness of the developed method, comparative pulping of sodium vitreous silicate was carried out according to the proposed method and previously known ones.Results. A method has been developed for activating quartz raw materials with sodium hydroxide to obtain vitreous sodium silicates using a mixture of two activation products, to obtain one of which parts of quartz raw materials and sodium hydroxide are taken in an eutectic ratio, and to obtain another activation product, the remainder of quartz raw materials and the calculated minimum the amount of sodium hydroxide required to obtain a shell on a quartz grain.Conclusion. Based on the results of comparative experimental cooking of tableted mixtures for silicate lumps using the developed method for activating quartz raw materials and using a mixture of quartz sand and sodium carbonate, the efficiency of the developed method, expressed in reducing the cooking temperature, is experimentally affected. The results of the study were issued in the form of a patent of the Russian Federation No. 2714415 "Method of preparing a charge for alkaline silicate glass".

APA, Harvard, Vancouver, ISO, and other styles

47

Ulan, J., and R. Gronsky. "Effect of alkali cations on the microstructure and composition of iron silicate catalysts." Proceedings, annual meeting, Electron Microscopy Society of America 47 (August 6, 1989): 268–69. http://dx.doi.org/10.1017/s0424820100153312.

Full text

Abstract:

Zeolites are shape selective catalysts widely used in industry. Selectivity arises from the fact that zeolites possess channels several angstroms in diameter which limits the size of species that can easily diffuse through. Promoted iron oxide is a highly active catalyst for the synthesis of hydrocarbons from CO and H2 (Fischer-Tropsch reaction) but researchers would like to narrow product selectivity to the C7-C10 gasoline range. Selectivity is improved by dispersing iron on zeolites and efforts are now directed at maximizing the iron distribution in the zeolite channels. One approach is to first incorporate iron directly into the zeolite framework during synthesis and then remove the iron from the zeolite framework and ideally form catalytically active iron oxide particles within the channels while still maintaining the pore structure of the zeolite. Iron silicate analogs of the zeolite ZSM-5 (FeZSM-5) have been synthesized and thermal treatments have been employed to produce a catalytic active material. The complete characterization by SEM and TEM of a series of FeZSM-5 catalysts with various Si/Fe ratios and preparation conditions has been achieved. This presentation is a continuation of that work. Three series of FeZSM-5 catalysts were synthesized, two had Si/Fe ratios of 45 with different Si/Al ratios and one had a Si/Fe ratio of 25. In each series, the synthetic conditions were modified by adding alkali metal cations (Li+, Na+ and K+) to the reaction mixture. It has been shown with ZSM-5 that the addition of alkali cations during synthesis produces large single crystals. The effect of alkali cations on the growth of zeolite analogs is interesting for several independent reasons ranging from basic studies of the mechanism of zeolite growth to practical experimental considerations. Single crystals are very desirable for electron microscopy studies: results are unambiguous for a single crystallite in one orientation compared to a region with many overlapping small particles.

APA, Harvard, Vancouver, ISO, and other styles

48

Zozulynets, V., та O. Kovalchuk. "Ефективність використання червоного шламу при розробці кислотостійких гібридних лужних цементів". Ways to Improve Construction Efficiency 1, № 51 (2023): 283–89. http://dx.doi.org/10.32347/2707-501x.2023.51(1).283-289.

Full text

Abstract:

The use of secondary industrial products has long been an integral part of the construction industry. The most common man-made raw materials used in the production of building materials, in addition to slag, are fly ash and red mud. This work is devoted to the study of the effectiveness of using red mud as an additional source of an alumina silicate component of man-made origin in the production of alkali-activated cements with increased acid resistance. In conventional cement systems, the use of significant amounts of red mud is not possible due to the high content of alkali metal compounds and heavy elements, but this is not a problem for alkali-activated binders. Red mud obtained by processing bauxite ore using the Bayer process is highly alkaline, and its disposal and reusability are hampered by high sodium concentrations and high pH. That is why, according to the analysis of literature sources, research on the integrated use of red mud is mainly found in only a few areas, among which construction occupies a leading position. In the course of research, the parameters of dough of normal density, hardening terms and strength for the developed systems were determined. Direct determination of the acid resistance index was also carried out using two methods: accelerated and by long-term aging of samples. In this way, the main physical and mechanical characteristics of the developed compounds were determined and the results were analyzed. The obtained results of the study confirmed the possibility of partially replacing alumina silicate components with red mud to obtain acid-resistant alkaline cements. It was found that the introduction of up to 30% of red mud makes it possible to obtain material with an acid resistance coefficient (Ks) in the range of 0.8-0.95.

APA, Harvard, Vancouver, ISO, and other styles

49

Hendricks, W. M., Alexis T. Bell, and C. J. Radke. "Effects of organic and alkali metal cations on the distribution of silicate anions in aqueous solutions." Journal of Physical Chemistry 95, no. 23 (1991): 9513–18. http://dx.doi.org/10.1021/j100176a087.

Full text

APA, Harvard, Vancouver, ISO, and other styles

50

Bayliss, Ryan D., Stuart N. Cook, David O. Scanlon, et al. "Understanding the defect chemistry of alkali metal strontium silicate solid solutions: insights from experiment and theory." J. Mater. Chem. A 2, no. 42 (2014): 17919–24. http://dx.doi.org/10.1039/c4ta04299a.

Full text

APA, Harvard, Vancouver, ISO, and other styles

Journal articles on the topic 'Alkali metal silicate'

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles