Academic literature on the topic 'MgO.Al2O3 .SiO2 system'

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Journal articles on the topic "MgO.Al2O3 .SiO2 system"

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Zhang, G. H., K. C. Chou, and X. Y. Lv. "Influences of different components on viscosities of CaO-MgO-Al2O3-SiO2 melts." Journal of Mining and Metallurgy, Section B: Metallurgy 50, no. 2 (2014): 157–64. http://dx.doi.org/10.2298/jmmb130819016z.

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The present study is aimed to distinguish the different influences of CaO and MgO, as well as Al2O3 and SiO2 on viscosity of CaO-MgO-Al2O3-SiO2 melts. It is found that for melt without Al2O3, viscosity increases monotonously as CaO is gradually replaced by MgO. The addition of Al2O3 leads to a complex variation of viscosity. In different composition ranges, viscosity may exhibit different variation tendencies as changing the relative contents of CaO and MgO while keeping contents of other components constant. It is also found that when replacing SiO2 by equivalent mole of Al2O3, (i) in CaOAl 2O3-SiO2 system, viscosity increases when Al2O3 content is small relative to CaO content (there are enough Ca2+ ions to charge compensate Al3+ ions), but decreases when CaO content is inadequate for charge compensation; (ii) in MgO-Al2O3-SiO2 system, viscosity always decreases as substituting Al2O3 for SiO2. The reason for this difference for two systems may be resulted from the weak charge compensation ability of Mg2+ ion for Al3+ ion relative to Ca2+ ion. All the viscosity variations can be interpreted well by our new proposed viscosity model.
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Mao, Huahai, Olga Fabrichnaya, Malin Selleby, and Bo Sundman. "Thermodynamic assessment of the MgO–Al2O3–SiO2 system." Journal of Materials Research 20, no. 4 (2005): 975–86. http://dx.doi.org/10.1557/jmr.2005.0123.

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Thermodynamic properties of the phases in the MgO–Al2O3–SiO2 system were assessed, resulting in a set of self-consistent thermodynamic data. The two ternary compounds, cordierite and sapphirine, were optimized from subsolidus reactions. The liquid phase was described by the ionic two-sublattice model with a new species AlO2−1, yielding the formula (Al+3,Mg+2)P(AlO2−1,O−2,SiO4−4,SiO20)Q. Projection of the liquidus surface was calculated. Various isothermal and isoplethal sections were compared with the experimental data.
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Liu, Li Xia, Gang Wang, Shi Jun Wang, Yun Chi Dong, and Yi Fan Chai. "Calculation of Phase Diagram of CaO-SiO2-Al2O3-MgO-B2O3 Refining Slag without CaF2." Advanced Materials Research 512-515 (May 2012): 1558–63. http://dx.doi.org/10.4028/www.scientific.net/amr.512-515.1558.

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CaF2 is used in large quantity during refining of steel, which is harmful to environment to be found. There is more and more study on use of B2O3 in metallurgical progress. This paper studied the effects of MgO on melting performance of CaO-SiO2-Al2O3 ternary system and B2O3 on that of CaO-SiO2-Al2O3-MgO quaternary system by calculation of phase diagram. The result shows that MgO can expand the range of liquid phase of CaO-SiO2-Al2O3 ternary system while the effect on melting performance is little. B2O3 can also reduce the melting point of CaO-SiO2-Al2O3-MgO quaternary system in high CaO zone and in high Al2O3 zone. So the proper composition of MgO in refining slag are 5~8% and B2O3 below 8%.
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Li, Wen Ping, Jun Hong Chen, Christoph Wohrmeyer, Hong Yan Guan, and Jia Lin Sun. "Study on Melting Properties of CaO-Al2O3-SiO2-MgO System Calcium Aluminate Flux." Advanced Materials Research 683 (April 2013): 569–72. http://dx.doi.org/10.4028/www.scientific.net/amr.683.569.

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Melting properties of CaO-Al2O3-SiO2-MgO system calcium aluminate (CA) flux were investigated through orthogonal design on three levels of four factors (content of CaO, Al2O3, SiO2 and MgO, respectively) to explore a reasonable chemical composition of CA flux. Results show that the softening temperature (Ts), hemispherical temperature (Th) and flowing temperature (Tf) of CA flux are influenced by the flux components in the order of SiO2 > MgO > CaO > Al2O3. The optimal chemical composition of flux is 3 wt.% SiO2, 6~12 wt.% MgO, 45 wt.% CaO and 40 wt.% Al2O3. Additionally, mineralogy composition analysis of flux clinker shows that the CA flux is mainly composed of 12CaO•7Al2O3 (C12A7), 3CaO•Al2O3 (C3A) and 6CaO•4Al2O3•MgO•SiO2 (C6A4MS, Q phase).
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Liao, Jinfa, Gele Qing, and Baojun Zhao. "Phase Equilibria Studies in the CaO-MgO-Al2O3-SiO2 System with Al2O3/SiO2 Weight Ratio of 0.4." Metals 13, no. 2 (2023): 224. http://dx.doi.org/10.3390/met13020224.

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With the raw materials for ironmaking becoming increasingly complex, more accurate phase equilibrium information on the slag is needed to refine the blast furnace operation to reduce the energy cost and CO2 emissions. CaO–SiO2–Al2O3–MgO is a basic system of ironmaking slag in which CaO and MgO mainly come from the flux, SiO2 and Al2O3 are mainly from raw materials. The effect of flux additions on the phase equilibrium of the slag can be described by a pseudo-ternary system CaO–MgO–(Al2O3+SiO2) at a fixed Al2O3/SiO2 ratio of 0.4. Liquidus temperatures and solid solutions in the CaO–MgO–Al2O3–SiO2 system with Al2O3/SiO2 weight ratio of 0.4 have been experimentally determined using high temperature equilibration and quenching techniques followed by electron probe microanalysis. Dicalcium silicate (Ca2SiO4), cordierite (2MgO·2Al2O3·5SiO2), spinel (MgO·Al2O3), merwinite (3CaO·MgO·2SiO2), anorthite (CaO·Al2O3·2SiO2), mullite (Al2O3·SiO2), periclase (MgO), melilite (2CaO·MgO·2SiO2-2CaO·Al2O3·SiO2) and forsterite (Mg2SiO4) are the major primary phases in the composition range investigated. A series of pseudo-binary phase diagrams have been constructed to demonstrate the application of the phase diagrams on blast furnace operation. Composition of the solid solutions corresponding to the liquidus have been accurately measured and will be used for the development of the thermodynamic database.
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Yu, Huixiang, Dexin Yang, Muming Li, and Ming Pan. "Metallurgical characteristics of refining slag used for high manganese steel." Metallurgical Research & Technology 116, no. 6 (2019): 620. http://dx.doi.org/10.1051/metal/2019050.

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High manganese steel has excellent mechanical properties, which has garnered much attention. Whereas the research on the refining slag used for high Mn steel is very limited. In this study, the metallurgical characteristics of refining slag for high Mn steel were investigated based on thermodynamic calculation with FactSage 6.3 and slag-metal equilibrium reaction in MgO crucible. The calculated liquid zones of T ≤ 1873 K of CaO-SiO2-Al2O3-8%MgO-5%MnO system are located in the middle region of pseudo-ternary CaO-SiO2-Al2O3. For CaO-SiO2-Al2O3-8%MgO-MnO system, the apparent liquid zone at 1873 K enlarges with MnO content in slag increasing, and moves toward the direction of SiO2 and Al2O3 content increasing. For CaO-SiO2-Al2O3-MgO-MnO system, the liquidus zone shrinks with the basicity increasing, and moves toward the direction of Al2O3 content increasing. The measured MnO content in top slag reacted with high Mn steel was much higher than that reacted with conventional steels. In present experiments, the MnO content was around 5% when CaO-SiO2-Al2O3-MgO slag with basicity of 4 was in equilibrium with high Mn steel (Mn = 10, 20%) at 1873 K. The inclusions in master high Mn steel were mainly MnO type. After reaction with top slag, most inclusions transformed to MnO-SiO2 system and MnO-Al2O3-MgO system, in which the MnO content still shared the majority. Thermodynamic calculations show that SiO2 in top slag can be reduced by [Mn] in steel to supply [Si] under present experimental condition, which subsequently reacts with [O] in steel bath to form SiO2.
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Cao, Jianqi, Yao Li, Wanming Lin, et al. "Assessment of Inclusion Removal Ability in Refining Slags Containing Ce2O3." Crystals 13, no. 2 (2023): 202. http://dx.doi.org/10.3390/cryst13020202.

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The elimination of inclusions in steelmaking processes has been widely studied. The removal of inclusions by slags containing the rare earth oxide Ce2O3 are studied using an integrated numerical model. The integrated model involves the inclusion motion model, interfacial tension calculation model, surface tension calculation model of slag, and the mass action concentration model, based on ion and molecule coexistence theory. The motion behaviors of both solid Al2O3 inclusions and 50%wtAl2O3–50%wtCaO liquid inclusions of varied sizes at CaO-Ce2O3-SiO2-Al2O3(-MgO) slag systems are evaluated. The results show that it is more difficult to remove the inclusions with smaller sizes and in slag with a higher viscosity. Liquid inclusions are more difficult to remove than solid inclusions. It is found that the CaO-Ce2O3-SiO2-Al2O3-MgO refining slag shows a better ability to remove Al2O3 inclusions than that of the CaO-SiO2-Al2O3-MgO slag. The reason for this is that the addition of the rare earth oxide Ce2O3 can decrease the viscosity of slags, as well as improving the wetting effects of slags on Al2O3 inclusions. For two slags systems, the CaO-Ce2O3-SiO2-Al2O3-MgO slag system shows a better ability to remove Al2O3 inclusions than the CaO-Ce2O3-SiO2-Al2O3 slag system. The addition of 5% to 8% Ce2O3 in a CaO-SiO2-Al2O3-MgO slag is an optimized case for industrial applications.
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Wang, Nan, Zong Shu Zou, Zhan Zhang, Yan Ping Xiao, and Yong Xiang Yang. "Thermodynamics of Slag Formation in Multi-Component Oxide Systems in Thermal Processing of Incineration Bottom Ash - Equilibrium Phase Relation in CaO-SiO2-FeOx-MgO System." Advanced Materials Research 194-196 (February 2011): 2175–78. http://dx.doi.org/10.4028/www.scientific.net/amr.194-196.2175.

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Vitrification is considered as an attractive procedure for municipal solid waste incineration ash, which can realize the volume reduction and innocent treatment of incineration ash, as well as reuse of bottom ash. The main oxide components of molten ash slag are CaO, Al2O3, SiO2, Fe2O3, MgO, and Na2O, accounting for more than 90% of the total mass. The phase relations and thermodynamic properties of the CaO-Al2O3-SiO2-FeOx-MgO-Na2O oxide system is highly required, and is of great significance for optimization of vitrification processing and sustainable resource utilization of melting slag. A study on the equilibria phase relations of CaO-SiO2-MgO-FeOx system was done by applying CALPHAD based on FactSage in this paper. The modeling parameters for the thermodynamic properties of liquid phase in CaO-SiO2-MgO-FeOx system were established and the equilibrium phase relations of MgO-SiO2-FeOx and CaO-SiO2-FeOx-MgO systems were calculated for different temperatures and oxygen partial pressures.
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Liao, Jinfa, Gele Qing, and Baojun Zhao. "Phase Equilibrium Studies in the CaO–SiO2–Al2O3–MgO System with MgO/CaO Ratio of 0.2." Metallurgical and Materials Transactions B 54, no. 2 (2023): 793–806. http://dx.doi.org/10.1007/s11663-023-02726-3.

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AbstractWith the raw materials for ironmaking are becoming increasingly complex, more accurate control of blast furnace operation is essential to reduce the energy cost and CO2 emission. CaO–SiO2–Al2O3–MgO is a basic system of ironmaking slag in which CaO and MgO are mainly come from the flux, SiO2 and Al2O3 are mainly from the raw materials. Effect of raw material composition on phase equilibrium of the slag can be described by a pseudo-ternary system (CaO + MgO)–SiO2–Al2O3 at a fixed MgO/CaO ratio of 0.2. High-temperature experiments have been carried out in this system, and the quenched samples were analyzed by an electron-probe microanalyzer. The results are presented in a pseudo-ternary phase diagram (CaO + MgO)–SiO2–Al2O3 with a fixed MgO/CaO weight ratio of 0.2. Dicalcium silicate (Ca2SiO4), Melilite (2CaO·MgO·2SiO2–2CaO·Al2O3·SiO2), spinel (MgO·Al2O3), merwinite (3CaO·MgO·2SiO2), and anorthite (CaO·Al2O3·2SiO2) are the major primary phases in the composition range investigated. A series of pseudo-binary phase diagrams have been constructed to demonstrate the applications of phase diagram on blast furnace operation. CaO-rich cordierite solid solution has been first time reported with the accurate compositions and microstructure. The liquidus temperatures and solid solution compositions are compared between the experimental data and FactSage predictions to provide useful information for optimization of the thermodynamic database.
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Lin, Yue, Yuanrong Yi, Minghang Fang, Wenqing Ma, and Wei Liu. "Prediction Model for SiO2 Activity in the CaO-Al2O3-SiO2-MgO Quaternary Slag System." Minerals 13, no. 4 (2023): 509. http://dx.doi.org/10.3390/min13040509.

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Activity models based on the ion and molecule coexistence theory have been widely used in the refining of metallurgical slags, with the SiO2 content of slag playing a crucial role in improving the mechanical properties of refining slag-based cementitious materials. In order to improve the reactivity of SiO2 in slag, this study established a SiO2 activity prediction model for the CaO-Al2O3-SiO2-MgO quaternary slag system based on the ion and molecule coexistence theory, validating the prediction results using reference values from the literature. Following this, the effects of w(SiO2), w(CaO), w(CaO)/w(Al2O3), and R(w(CaO)/w(SiO2)) on SiO2 activity were explored (where w and R represent content and alkalinity, respectively). The results show that the model could accurately predict the SiO2 activity of refining slag at 1873k. When the SiO2 content was increased from 10% to 30%, with 60% w(CaO) and a w(MgO)/w(Al2O3) ratio of 0.25, the SiO2 activity exhibited a trend of initially increasing and then decreasing, with a maximum activity value of 0.1359 reached at 17.5% w(SiO2). When slag contained 15% w(SiO2) and a w(MgO)/w(Al2O3) ratio of 0.25, the SiO2 activity decreased with increasing CaO content, reaching a maximum activity value of 0.1268 when 55% w(CaO) was present. Therefore, by controlling the ratio of w(CaO)/w(Al2O3) and w(CaO)/w(SiO2) in the slag to maintain a ratio of 3, the activity of SiO2 can be effectively increased.
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Dissertations / Theses on the topic "MgO.Al2O3 .SiO2 system"

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Gao, Zimin. "Phase Relationships in the System CaO-MgO-Al2O3-SiO2 in Plagioclase Lherzolite Field." FIU Digital Commons, 1991. http://digitalcommons.fiu.edu/etd/3615.

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Unreversed phase equilibrium studies were carried out in a model mantle composition CaO-MgO-Al2O3-SiO2 (CMAS) system at 5-9 kb and 12 7 0-13 3 CPC. The experiments provide a set of data which narrowly constraints the position of the solidus in the system CMAS in the plagioclase lherzolite field. All runs were conducted in a 2.54 cm core-diameter piston-cylinder apparatus with salt-cell pressure medium. The equilibrium compositions of the mineral phases and glass were analyzed with an electron microprobe. The A12O3 contents in orthopyroxene and clinopyroxene coexisting with olivine and plagioclase increase with pressure. The deduced alumina isopleths in orthopyroxene and clinopyroxene have higher slope in P-T space than those of theoretical calculations. An empirical pyroxene geobarometer has been developed and applied to the plagioclase lherzolite xenoliths in Hawaiian basalt.
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Ponton, Clive Brian. "The mechanical properties of glass-ceramics in the system CaO-MgO-Al2O3-SiO2." Thesis, Imperial College London, 1987. http://hdl.handle.net/10044/1/47692.

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Hota, Belma [Verfasser], and Joachim [Akademischer Betreuer] Deubener. "Einfluss der Gefügeentwicklung auf die Kratzempfindlichkeit von Glaskeramiken im System MgO-Al2O3-SiO2 und Li2O-SiO2 / Belma Hota ; Betreuer: Joachim Deubener." Clausthal-Zellerfeld : Technische Universität Clausthal, 2018. http://d-nb.info/1231363819/34.

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Ma, Haoyuan. "Study on preparation of high performance CaO-MgO-Al2O3-SiO2 system glass-ceramic with industrial by-products." Scholarly Commons, 2014. https://scholarlycommons.pacific.edu/uop_etds/221.

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Blast furnace slag (BFS), iron ore tailings (IOT), and coal fly ash (CFA) are common industrial by-products with huge annual yield and low reuse rate (< 30%). This research was intended to prepare high performance glass-ceramics from these three industrial by-products. What's more, two energy saving methods were put forward. One was application of single-stage heat treatment, another was mixing cold solid raw material (IOT, CFA) with melted BFS discharged at 1500 in iron making process instead of mixing all the raw material in room temperature and then heating them to melt. Different binary basicity (MCaO /MSiO2 ) and content of Al2O3 had been studied to determine the best formula for high performance glass-ceramic in terms of mechanical properties. Sample 04 (MCaO /MSiO2 =0.4, Al2O3 wt. %=9%) and Sample 05Al-2 (MCaO /MSiO2 =0.5, Al2O3 wt. %=12%) were found with the highest bending strength, 94 MPa and 89 MPa respectively. In addition, with augite and diopside as primary crystalline phase, they also had a Vickers micro-hardness of 6.2 GPa and 6.3 GPa. When applied single-stage heat treatment, sample H4 obtained a bending strength of 77.89MPa and Vickers micro-hardness of 6.5 GPa, very close to H0. Meanwhile, when applied hot liquid-cold solid mixing method, M3 obtained a bending strength of 80.51 MPa, also very close to M0. Which indicates that these two energy saving method are all feasible to be applied to prepare high performance glass-ceramic.
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Welch, Mark David. "Experimental studies of selected amphiboles in the system Na2O-CaO-MgO-Al2O3-SiO2-H2O-F2 and its subsystems." Thesis, University of Edinburgh, 1987. http://hdl.handle.net/1842/11947.

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Dittmer, Marc [Verfasser], Christian [Akademischer Betreuer] Rüssel, and Dörte [Akademischer Betreuer] Stachel. "Gläser und Glaskeramiken im System MgO-Al2O3-SiO2 mit ZrO2 als Keimbildner / Marc Dittmer. Gutachter: Christian Rüssel ; Dörte Stachel." Jena : Thüringer Universitäts- und Landesbibliothek Jena, 2012. http://d-nb.info/1018652973/34.

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Shin, Jin-Wook. "The experimantal and theoretical determination of the thermodynamic properties of melts and glasses from the system CaO-MgO-Al2O3-SiO2." [S.l.] : [s.n.], 2004. http://deposit.ddb.de/cgi-bin/dokserv?idn=975613715.

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Shin, Jin-Wook. "The experimental and theoretical determination of the thermodynamic properties of melts and glasses from the system CaO-MgO-Al2O3-SiO2 /." Aachen : Shaker, 2004. http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&doc_number=013110727&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA.

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Veit, Ulrike [Verfasser], Christian [Gutachter] Rüssel, and Dörte [Gutachter] Stachel. "Entwicklung hochfester Gläser aus dem CaO-(MgO-)Al2O3-SiO2-System für die Verstärkung von Kompositmaterialien / Ulrike Veit ; Gutachter: Christian Rüssel, Dörte Stachel." Jena : Friedrich-Schiller-Universität Jena, 2018. http://d-nb.info/117039678X/34.

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Shin, Jin-Wook [Verfasser]. "The experimental and theoretical determination of the thermodynamic properties of melts and glasses from the system CaO-MgO-Al2O3-SiO2 / Jin-Wook Shin." Aachen : Shaker, 2004. http://d-nb.info/1181602912/34.

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Books on the topic "MgO.Al2O3 .SiO2 system"

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Choi, Ellen Eun-Ha. Multicomponent diffusion in the system K2O-Na2O-FeO-MgO-TiO2-P2O5-Al2O3-SiO2. 2004.

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Физические свойства расплавов системы CaO-SiO2-Al2O3-MgO. 1987.

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Физические свойства расплавов системы CaO-SiO2-Al2O3-MgO. 1987.

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Krönert, Wolfgang. Untersuchung der Phasengleichgewichte und Reaktionen Im System MgO · Cr2O3 - 2MgO · SiO2 - 2CaO · SiO2. VS Verlag fur Sozialwissenschaften GmbH, 2013.

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Došler, Urban. Glass and Glass-Ceramic Based on the MgO-B2O3-SiO2 System: The Synthesis and Characterization of Glass-Ceramic Based on Ternary System MgO-B2O3-SiO2. LAP Lambert Academic Publishing, 2011.

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Krönert, Wolfgang. Untersuchungen Im System Al2O3-SiO2: Das Umwandlungsverhalten Von Kyanit, Andalusit und Sillimanit. VS Verlag fur Sozialwissenschaften GmbH, 2013.

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Mahoney, Francis Michael. Sinterverhalten und Phasenbeziehungen von Si3N4-Keramiken im System Si3N4-SiO2-MgO-Y2O3. 1992.

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Schwiete, Hans-Ernst. Untersuchungen über Festkörperreaktionen Im System BaO -- Al2O3 -- SiO2 Mit Hilfe der Infrarot-Spektroskopie. VS Verlag fur Sozialwissenschaften GmbH, 2013.

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Terhart, Ludger. Zustandsgleichung der Spinelle im System MgO-FeO-AlO-CrO-FeO MgO-FeO-Al2O3-Cr2O3-Fe2O3: Theorie, Auswertung u. Perspektiven für d. geolog. Anwendung. 1985.

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Fabrichnaya, Olga. Thermodynamic Study of the Fe0-Mg0-Al203-Si02 System: Data Assessment and Phase Diagram Calculation. Acta Universitatis Upsaliensis, 1998.

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Book chapters on the topic "MgO.Al2O3 .SiO2 system"

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Gasparik, Tibor. "System MgO–Al2O3–SiO2." In Phase Diagrams for Geoscientists. Springer New York, 2013. http://dx.doi.org/10.1007/978-1-4614-5776-3_3.

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Gasparik, Tibor. "System MgO-Al2O3-SiO2." In Phase Diagrams for Geoscientists. Springer Berlin Heidelberg, 2003. http://dx.doi.org/10.1007/978-3-540-38352-9_3.

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Gasparik, Tibor. "System Na2O–MgO–Al2O3–SiO2." In Phase Diagrams for Geoscientists. Springer New York, 2013. http://dx.doi.org/10.1007/978-1-4614-5776-3_8.

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Gasparik, Tibor. "System Na2O-MgO-Al2O3-SiO2." In Phase Diagrams for Geoscientists. Springer Berlin Heidelberg, 2003. http://dx.doi.org/10.1007/978-3-540-38352-9_8.

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Gasparik, Tibor. "System CaO–MgO–Al2O3–SiO2 Undersaturated with Silica." In Phase Diagrams for Geoscientists. Springer New York, 2013. http://dx.doi.org/10.1007/978-1-4614-5776-3_5.

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Gasparik, Tibor. "System CaO–MgO–Al2O3–SiO2 Saturated with Silica." In Phase Diagrams for Geoscientists. Springer New York, 2013. http://dx.doi.org/10.1007/978-1-4614-5776-3_6.

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Gasparik, Tibor. "System CaO-MgO-Al2O3-SiO2 Undersaturated with Silica." In Phase Diagrams for Geoscientists. Springer Berlin Heidelberg, 2003. http://dx.doi.org/10.1007/978-3-540-38352-9_5.

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Gasparik, Tibor. "System CaO-MgO-Al2O3-SiO2 Saturated with Silica." In Phase Diagrams for Geoscientists. Springer Berlin Heidelberg, 2003. http://dx.doi.org/10.1007/978-3-540-38352-9_6.

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An, Haifei, Jie Li, Aimin Yang, Weixing Liu, and Can Tian. "Kinetic Model of Silica Dissolution in CaO–SiO2–MgO–Al2O3 Slag System." In TMS 2019 148th Annual Meeting & Exhibition Supplemental Proceedings. Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-05861-6_102.

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Jiao, Mengjiao, Guishang Pei, Zhuoyang Li, and Xuewei Lv. "Phase Equilibria and Thermodynamic Modeling of CaO-SiO2-MgO-Al2O3-TiO2 System." In The Minerals, Metals & Materials Series. Springer Nature Switzerland, 2025. https://doi.org/10.1007/978-3-031-80664-3_2.

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Conference papers on the topic "MgO.Al2O3 .SiO2 system"

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Trommer, Rafael Mello, Álvaro Niedesberg Lima, Juliane Vicenzi, Saulo Roca Bragança, and Carlos Pérez Bergmann. "IDENTIFICAÇÃO E AVALIAÇÃO DOS MECANISMOS DE ATAQUE DA ESCÓRIA SiO2-CaO-Al2O3-MgO EM TIJOLOS REFRATÁRIOS DE MgO-C1." In 61º Congresso Anual da ABM. Editora Blucher, 2006. https://doi.org/10.5151/2594-5327-2005-14277-0080.

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Heck, Nestor Cezar, Jeferson Leandro Klug, and Antônio Cezar Faria Vilela. "THERMODYNAMIC EVALUATION OF THE SLAGS OF THE CaO-SiO2-CrOx-MgO SYSTEM AT 1873K." In 66º Congresso Anual da ABM. Editora Blucher, 2011. https://doi.org/10.5151/2594-5327-18009.

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Wang, Y., S. Sukenaga, W. Z. Mu, H. Zhang, H. W. Ni, and H. Shibata. "Crystallisation control of CaO-SiO2-Al2O3-MgO system inclusion." In 12th International Conference of Molten Slags, Fluxes and Salts (MOLTEN 2024) Proceedings. Australasian Institute of Mining and Metallurgy (AusIMM), 2024. http://dx.doi.org/10.62053/xqxm9056.

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The crystallisation behaviour of low melting point CaO-SiO2-Al2O3-MgO inclusions greatly affect the deformability of inclusions during the rolling process. The crystallisation characteristics of CaO-SiO2-Al2O3-MgO melts representing the oxide inclusions in Si-Mn killed steel were systematically investigated. The effect of Al2O3 and MgO contents on the crystallisation change were analysed under a fixed CaO/SiO2 in the complex inclusions. The continuous-cooling-transformation (CCT) and time-temperature-transformation (TTT) experiments were conducted. The results showed that the increase of MgO content increases the crystallisation ability of CaO-SiO2-Al2O3-MgO inclusions, while the increase of Al2O3 content has the opposite effect. The viscosity, liquidus temperature of oxide melt and also the initial crystallisation potential might be the reasons for the change in crystallisation behaviour. Also, the crystallisation activation energy could semi-quantitatively characterise the crystal growth during the crystallisation of inclusions. To obtain low melting point plasticized CaO-SiO2-Al2O3-MgO (CaO/SiO2=1) system inclusions, the Al2O3 content of the system needs to be controlled larger than 15 wt per cent and the MgO content should be kept at a small amount.
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Laidens, B., W. Bielefeldt, and D. Souza. "Machine learning for predicting chemical system behaviour of CaO-MgO-SiO2-Al2O3 steelmaking slags case study." In 12th International Conference of Molten Slags, Fluxes and Salts (MOLTEN 2024) Proceedings. Australasian Institute of Mining and Metallurgy (AusIMM), 2024. http://dx.doi.org/10.62053/ekon9161.

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The CaO-MgO-SiO2-Al2O3 system, characterised by its intricate phases and thermodynamic properties, plays a pivotal role in steel secondary refining processes, encompassing desulfurisation, non-metallic inclusion capture, and refractory protection. Accurate predictions for diverse industrial applications, including metallurgy, ceramics, and materials science, are imperative. To address this challenge, a combination of machine learning techniques will be specifically applied to model the liquid fraction of the slag and the solid fraction of MgO. The development of an artificial intelligence (AI) system, leveraging various machine learning techniques, has gained momentum in this project. The focus of this work is on constructing an AI model, based on machine learning techniques, within the CaO-MgO-SiO2-Al2O3 system, utilising simulation results from FactSage™, version 8.1 (by GTT Technologies). The primary objective is to train the AI model using these simulation outputs to predict the percentage of liquid fraction and MgO saturation based on chemical composition parameters. The AI model will undergo training with a comprehensive data set of simulations within the CaO-MgO-SiO2-Al2O3 system, covering a diverse range of compositional at 1873 K. These simulations, conducted through FactSage™ 8.1 software, provide a robust foundation for AI model training, ensuring generalisability and precise predictions for the liquid fraction of the slag and the solid fraction of MgO, the solid fraction of MgO in this case is determined by the difference between the total MgO and the MgO in the liquid fraction, so it is not the objective of this study to determine which phase of MgO is in the solid state.. The predictive capabilities of this AI model hold significant implications for process optimisation, quality control, and decision-making in CaO-MgO-SiO2-Al2O3-dependent industries. Precise estimations of the liquid fraction and MgO saturation empower researchers and engineers to enhance operational efficiency and quality. This paper explores the methodologies employed for AI model creation and training, achieved results in terms of prediction accuracy, and potential applications in the field. The development of this AI system signifies a notable advancement in utilising machine learning for better comprehension and control of complex chemical systems. Furthermore, to align the study with real-world steel production, we introduce FeO and MnO at concentrations of 2 per cent and 1 per cent at 1873 K, respectively, following the validation of model results using the CaO-MgO-SiO2-Al2O3 system. This adjustment aims to bring the study closer to the observed reality in steel mills globally.
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SNIEGOŇ, Michal, Markéta TKADLEČKOVÁ, Tomáš HUCZALA, et al. "Thermodynamic Analysis of CaO - SiO2 - Al2O3 - MgO slag system." In METAL 2021. TANGER Ltd., 2021. http://dx.doi.org/10.37904/metal.2021.4084.

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Gyakwaa, F., S. Wang, H. Singh, et al. "Assessment of phase evolution in CaO–MgO–Al2O3–SiO2 system with varied Al2O3/SiO2 ratio using in situ high-temperature Raman spectroscopy and X-ray scattering." In 12th International Conference of Molten Slags, Fluxes and Salts (MOLTEN 2024) Proceedings. Australasian Institute of Mining and Metallurgy (AusIMM), 2024. http://dx.doi.org/10.62053/waha9886.

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Metallurgical slag, such as refining slag, is essential to enhance or promote steel cleanliness. The CaO–MgO–Al2O3–SiO2 system is the primary source of oxides-based inclusions. It plays a vital role in applications in various pyrometallurgical processes. Numerous thermodynamic databases and physicochemical properties of slag studies mainly focus on quenched samples and measurements at room temperature. Consequently, the present study explored the physicochemical, structural properties and crystallisation evolution for CaO–MgO–Al2O3–SiO2 glassy slags via in situ high-temperature Raman spectroscopy and synchrotron X-ray diffraction. The study was carried out by synthesising CaO–MgO–Al2O3–SiO2 slag with varying Al2O3/SiO2 ratios. The results from the in situ high-temperature measurement demonstrated a pattern showing a transformation of a broad peak from the glassy matrix to crystalline peaks. The study showed crystallisation of dominant phases such as Ca2SiO4, Ca2Al2SiO7 and CaAl2O4 that correspond and are attributable to changes of structural units during in situ high-temperature measurements. The results further showed a correlation between an increase and transformation in crystalline phases observed from the spectra obtained from non-isothermal heating of the samples.
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Upolovnikova, Alena, Anatoly Babenko, Ruslan Shartdinov, and Artem Smetannikov. "Physicochemical properties of the CaO-SiO2-B2O3-MgO-Al2O3 slags system." In PROCEEDINGS OF THE 16TH INTERNATIONAL CONFERENCE ON INDUSTRIAL MANUFACTURING AND METALLURGY (ICIMM 2021). AIP Publishing, 2022. http://dx.doi.org/10.1063/5.0074879.

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Jun, Y. J., G. H. Park, and J. H. Park. "Carbon distribution behaviour between molten iron and CaO-Al2O3-FeO-SiO2-MgO slag at 1873 K." In 12th International Conference of Molten Slags, Fluxes and Salts (MOLTEN 2024) Proceedings. Australasian Institute of Mining and Metallurgy (AusIMM), 2024. http://dx.doi.org/10.62053/uqzr8470.

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The carbon solubility of the CaO-Al2O3-FeO-SiO2-MgO slag, the main system formed in the Ruhrstahl-Heraeus (RH) vacuum degasser, was measured at 1873 K to understand the effect of slag compositions on the carbon contamination in the ultra-low carbon (ULC) steels. The stable form of carbon was demonstrated to be carbonate by plotting the log [(wt%C)/aC] ratio against the log p(O2) which ranged -11 &lt; log p(O2,atm) &lt; -9. The carbon solubility of the CaO-Al2O3-FeO-SiO2-MgO slag can be estimated using thermodynamic model. The distribution ratio of carbon increased with increasing concentration of FeO due to the FeO reduction reaction and increased basicity of slag. The carbonate capacity of the CaO-Al2O3-FeO-SiO2-MgO slag can be expressed as a linear function of the activity of lime and the optical basicity.
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Sun, L., J. Shi, J. Qiu, B. Zhang, and M. Jiang. "Phase Equilibrium in the 30% Al2O3 Plane of the Quaternary CaO-SiO2-MgO-Al2O3 System." In MS&T17. MS&T17, 2017. http://dx.doi.org/10.7449/2017/mst_2017_1258_1265.

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Sun, L., J. Shi, J. Qiu, B. Zhang, and M. Jiang. "Phase Equilibrium in the 30% Al2O3 Plane of the Quaternary CaO-SiO2-MgO-Al2O3 System." In MS&T17. MS&T17, 2017. http://dx.doi.org/10.7449/2017mst/2017/mst_2017_1258_1265.

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Reports on the topic "MgO.Al2O3 .SiO2 system"

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Berman, R. G., L. Ya Aranovich, M. Genkin, and U. K. Mader. Phase equilibrium constraints on the stability of biotite. Part 1: Mg-Al biotite in the system K2O-MgO-Al2O3-SiO2-H2O-CO2. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1995. http://dx.doi.org/10.4095/205208.

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Ya Aranovich, L., and R. G. Berman. Solubility of Al2O3 in orthopyroxene equilibrated with almandine in the system FeO-Al2O3-SiO2. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1995. http://dx.doi.org/10.4095/205210.

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Berman, R. G., L. Ya Aranovich, and D. G. Rancourt. Phase equilibrium constraints on the stability of biotite. Part 2: Fe-Al biotite in the system K2O-FeO-Al2O3-SiO2-H2O. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1995. http://dx.doi.org/10.4095/205209.

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Kuster, K., C. M. Lesher, and M. G. Houlé. Geology and geochemistry of mafic and ultramafic bodies in the Shebandowan mine area, Wawa-Abitibi terrane: implications for Ni-Cu-(PGE) and Cr-(PGE) mineralization, Ontario and Quebec. Natural Resources Canada/CMSS/Information Management, 2022. http://dx.doi.org/10.4095/329394.

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The Shebandowan Ni-Cu-(PGE) deposit occurs in the Shebandowan greenstone belt in the Wawa-Abitibi terrane. This deposit is one of a few economic Ni-Cu-(PGE) deposits in the Superior Province and one of a very few deposits worldwide that contains both Ni-Cu-(PGE) and Cr-(PGE) mineralization. The mafic-ultramafic successions in the area comprise abundant flows and sills of tholeiitic basalt and lesser Al-undepleted komatiite (MgO &amp;amp;gt;18 wt%, Al2O3/TiO2 = 15-25), the latter indicating separation from mantle sources at shallow levels. Siliceous high-Mg basalts (MgO 8-12 wt%, SiO2 &amp;amp;gt; 53 wt%, TiO2 &amp;amp;lt; 1.2 wt%, La/Sm[MN] &amp;amp;lt; 1-2) are relatively abundant in the area and likely represent crustally contaminated komatiites. Ultramafic bodies in the Shebandowan mine area comprise at least three or four komatiitic sills (A-B, C, D) and at least two komatiitic flows (E, F), all of which are altered to serpentinites or talc-carbonate schists with relict igneous chromite and rare relict igneous orthopyroxene-clinopyroxene. Unit A-B contains pentlandite-pyrrhotite-chalcopyrite-pyrite-magnetite mineralization, occurring as massive sulfides, sulfide breccias, or stringers, and subeconomic chromite mineralization in contorted massive bands varying from a few millimetres up to 10 metres thick. The localization of massive and semi-massive Ni-Cu-(PGE) ores along the margins of Unit A and the paucity of disseminated and net-textured ores suggest tectonic mobilization. Chromite is typically zoned with Cr-Mg-Al-rich (chromite) cores and Fe-rich (ferrichromite/magnetite) rims due to alteration and/or metamorphism, but rarely contains amoeboid magnetite cores. The thickness of chromite in Unit B is too great to have crystallized in cotectic proportion from the komatiitic magma and a model involving dynamic upgrading of magnetite xenoliths derived from interflow oxide facies iron formations is being tested.
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Boily-Auclair, É., P. Mercier-Langevin, P. S. Ross, and D. Pitre. Alteration and ore assemblages of the LaRonde Zone 5 (LZ5) deposit and Ellison mineralized zones, Doyon-Bousquet-LaRonde mining camp, Abitibi, Quebec. Natural Resources Canada/CMSS/Information Management, 2022. http://dx.doi.org/10.4095/329637.

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The LaRonde Zone 5 (LZ5) mine is part of the Doyon-Bousquet-LaRonde mining camp and is located in the southern part of the Abitibi greenstone belt in northwestern Quebec. The LZ5 deposit consists of three stacked mineralized corridors: Zone 4, Zone 4.1, and Zone 5. Zones 4 and 4.1 are discontinuous satellite mineralized corridors, whereas Zone 5 represents the main mineralized body. The mineralized zones of the LZ5 deposit and adjacent Ellison property (Ellison A and B zones) are hosted in the strongly-deformed, 2699-2695 Ma transitional to calcalkaline, intermediate to felsic, volcanic and volcaniclastic rocks of the Bousquet Formation upper member, which is part of the Blake River Group (2704-2695 Ma). Zones 4, 4.1, and 5 at the LZ5 mine are hosted in intermediate volcanic and volcaniclastic rocks of the Westwood andesitic to rhyodacitic unit (unit 5.1a), which forms the base of the upper member of the Bousquet Formation. The Ellison Zone A is hosted higher up in the stratigraphic sequence within a newly described intermediate volcanic unit. The Ellison Zone B is hosted in felsic volcanic and volcaniclastic rocks of the Westwood feldsparphyric rhyolite dome (subunit 5.3a-(b)). Mineralization in all three zones of the LZ5 deposit consists of discordant networks of millimeter- to centimeter-thick pyrite ±chalcopyrite ±sphalerite ±pyrrhotite veins and veinlets (10-20 % of the volume of the rock) and, to a lesser extent, very finely disseminated pyrite and boudinaged veins (less than or equal to 5 vol. % each) in strongly altered host rocks. Gold commonly occurs as microscopic inclusions in granoblastic pyrite and at the triple junction between recrystallized grains. The veins, stockworks, and disseminations were intensely folded and transposed in the steeply south-dipping, east-west trending S2 foliation. The vein network is at least partly discordant to the stratigraphy. A distal alteration halo envelops the LZ5 mineralized corridors and consists of a sericite-carbonate-chlorite- feldspar ±biotite assemblage. A proximal sericite-carbonate-chlorite-pyrite-quartz- feldspar-biotite ±epidote alteration assemblage is present within the LZ5 mineralized zones. A local proximal alteration assemblage of sericite-quartz-pyrite is also locally developed within Zone 4 and Zone 5 of the LZ5 deposit. Mass gains in Fe2O3 (t) and K2O, and mass losses in CaO, MgO, Na2O, and locally SiO2, are characteristic of the LZ5 alteration zones. The Ellison zone A and B are similar to LZ5 in terms of style of mineralization, but thin (10-20 cm) veins or bands of semi-massive to massive, finely recrystallized disseminated pyrite (0.1-1 mm) are distinctive. Chalcopyrite and sphalerite are also slightly more abundant in the mineralized corridors of the Ellison property and are usually associated with elevated gold grades. The zones are also slightly richer than at LZ5 in terms of gold and silver content, but narrower and less continuous in general. The Ellison Zone A is characterized by gains in Fe2O3 (t) and K2O and losses in CaO, MgO, Na2O, and SiO2. Gains in Fe2O3 (t) and local gains in K2O, MgO, and MnO, and losses in CO2, Na2O, P2O5, and SiO2, characterize the felsic host rocks of the Zone B corridor. The style of mineralization at LZ5 (pyrite ±chalcopyrite veins and veinlets, ±disseminated pyrite with low base metal content), its setting (i.e. in rocks of intermediate composition at the base of the upper member of the Bousquet Formation), and the geometry of its ore zones (stacked lenses of sulfide veins and veinlets, without massive sulfide lenses) differ from the other major deposits of the Doyon-Bousquet-LaRonde mining camp. Despite these differences, this study indicates that the LZ5 and Ellison mineralized corridors are of synvolcanic hydrothermal origin and have most likely been formed by convective circulation of seawater below the seafloor. An influx of magmatic fluids from the Mooshla synvolcanic intrusive complex or its parent magma chamber could explain the Au enrichment at LZ5, as has been suggested for other deposits of the camp. Evidence for a pre-deformation synvolcanic mineralization at LZ5 includes ductile deformation and recrystallization of the sulfides, the stacked nature of its ore zones, subconcordant alteration halos that envelop the mineralized corridors, evidence that the mineralized system was already active when the LZ5 lenses were deposited and control on mineralization by primary volcanic features such as the permeability and porosity of the volcanic rocks.
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