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Journal articles on the topic 'Chromide'

Author: Grafiati

Published: 25 May 2024

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1

Scheer, M., та P. G. Jones. "Bis(triphenylphosphine-P)iminium Trichloro(η5-cyclopentadienyl)chromide(III)". Acta Crystallographica Section C Crystal Structure Communications 53, № 8 (1997): 1038–39. http://dx.doi.org/10.1107/s0108270197005234.

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2

Armstrong, RD, and HW Ferguson. "Systemic viral disease of the chromide cichlid Etroplus maculates." Diseases of Aquatic Organisms 7 (1989): 155–57. http://dx.doi.org/10.3354/dao007155.

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3

Jithendran, K. P., A. Navaneeth Krishnan, P. T. Aneesh, P. Ezhil Praveena, and T. Bhuvaneswari. "Susceptibility of orange chromide, Etroplus maculatus (Bloch, 1795) to experimental infection of Betanodavirus." Aquaculture International 29, no. 2 (2021): 697–710. http://dx.doi.org/10.1007/s10499-021-00648-y.

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4

Butvina, V. G., S. S. Vorobey, O. G. Safonov, D. A. Varlamov, G. V. Bondarenko, and Yu B. Shapovalov. "Experimental study of formation of chromian priderite and yimengite as products of modal mantle metasomatism." Доклады Академии наук 486, no. 6 (2019): 709–13. http://dx.doi.org/10.31857/s0869-56524866709-713.

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The article presents the data of a series of experiments on the synthesis of exotic titanates (priderite and yimengite) as a result of the reproduction of metasomatic conditions of transformation of mantle minerals (chromite, ilmenite). It was first synthesized chromian priderite not containing Ba. The experiments showed the possibility of crystallization of this mineral as a reaction product of high-chromium spinel and rutile with potassium aqueous carbonate fluid (melt) in the upper mantle. In particular, the obtained experimental data allow us to interpret the relationship between K-Cr-prid

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5

Ostrander, Gary K., and Jack A. Ward. "The function of the pelvic fins during courtship and spawning in the orange chromide, Etroplus maculatus." Environmental Biology of Fishes 13, no. 3 (1985): 203–10. http://dx.doi.org/10.1007/bf00000932.

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6

Escudero-Castejon, Lidia, Sergio Sanchez-Segado, Stephen Parirenyatwa, and Animesh Jha. "Formation of Chromium-Containing Molten Salt Phase during Roasting of Chromite Ore with Sodium and Potassium Hydroxides." Journal for Manufacturing Science and Production 16, no. 4 (2016): 215–25. http://dx.doi.org/10.1515/jmsp-2016-0023.

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AbstractChromium has a wide range of applications including metals and alloys manufacturing, pigments, corrosion resistance coatings and leather tanning. The production of chromium chemicals is based on the oxidative alkali roasting of chromite ores, which leads to the formation of water-soluble alkali chromates. Previous investigations reported that when chromite is roasted with soda-ash, a molten salt containing chromium, which is mainly composed of sodium carbonate and sodium chromate (Na2CO3-Na2CrO4 binary mixture), forms under typical roasting conditions. The physical properties of the li

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Lalomov, Alexander V., Ildar R. Rakhimov, and Antonina V. Grigor’eva. "Chromite placer occurrences of the Volga-Ural basin – genesis, sources and industrial potential." Georesursy 23, no. 3 (2021): 143–48. http://dx.doi.org/10.18599/grs.2021.3.17.

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Chromium is a strategic metal, but more than a half of Russia’s needs are met by imports, so new deposits of chromites, including unconventional placer deposits, are of industrial and scientific interest. Previous studies and current works of the authors of the article have established the chromite placer metal content of Permian-Jurassic deposits of the Volga-Ural basin, which has industrial and potential significance: within the Lukoyanovsky placer area (Nizhny Novgorod region), the industrial chromite content of Jurassic coastal-marine titanium-zirconium placers has been established; in the

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8

Bhat, Aadil, Anutosh Paria, A. Deepika, et al. "Molecular cloning, characterisation and expression analysis of melanoma differentiation associated gene 5 (MDA5) of green chromide, Etroplus suratensis." Gene 557, no. 2 (2015): 172–81. http://dx.doi.org/10.1016/j.gene.2014.12.028.

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9

Henry, Karen S., John C. Petura, Steven Brooks, Steven Dentico, Stephen A. Kessel, and Mark Harris. "Preventing surface deposition of chromium with asphalt caps at chromite ore processing residue sites: a case study." Canadian Geotechnical Journal 44, no. 7 (2007): 814–39. http://dx.doi.org/10.1139/t07-029.

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Caps were constructed on chromite ore processing residue (COPR) sites in the Kearny, New Jersey, area between 1989 and 1994 to prevent human exposure to hexavalent chromium (Cr(VI)). The caps comprise geotextile overlain by 100 mm of dense graded aggregate (DGA) and 100 mm of hot mix asphalt (HMA). Prior to constructing these "composite asphalt caps" (CACs), Cr(VI) was sometimes deposited on surface soils as chromate (salts) during evaporative periods. We initially thought the geotextile and DGA acted as a capillary barrier, stopping capillary water rise, but site inspection revealed that the

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10

Dey, Satarupa, Baishali Pandit, and A. K. Paul. "Reduction of Hexavalent Chromium by Viable Cells of Chromium Resistant Bacteria Isolated from Chromite Mining Environment." Journal of Mining 2014 (August 10, 2014): 1–8. http://dx.doi.org/10.1155/2014/941341.

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Environmental contamination of hexavalent chromium [Cr(VI)] is of serious concern for its toxicity as well as mutagenic and carcinogenic effects. Bacterial chromate reduction is a cost-effective technology for detoxification as well as removal of Cr(VI) from polluted environment. Chromium resistant and reducing bacteria, belonging to Arthrobacter, Pseudomonas, and Corynebacterium isolated from chromite mine overburden and seepage samples of Orissa, India, were found to tolerate 12–18 mM Cr(VI) during growth. Viable cells of these isolates were also capable of growing and reducing 100 μM Cr(VI)

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11

Swaminathan, T. Raja, Wazir S. Lakra, A. Gopalakrishnan, V. S. Basheer, B. Khushwaha, and K. A. Sajeela. "Development and characterization of a new epithelial cell line PSF from caudal fin of Green chromide, Etroplus suratensis (Bloch, 1790)." In Vitro Cellular & Developmental Biology - Animal 46, no. 8 (2010): 647–56. http://dx.doi.org/10.1007/s11626-010-9326-y.

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12

Liu, Cheng Jun, Jie Qi, and Mao Fa Jiang. "Experimental Study on Sulfuric Acid Leaching Behavior of Chromite with Different Temperature." Advanced Materials Research 361-363 (October 2011): 628–31. http://dx.doi.org/10.4028/www.scientific.net/amr.361-363.628.

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Utilizing Pakistan chromite as raw material, the rapid leaching of chromium and iron could be realized by the sulfuric acid leaching process on the condition of atmospheric pressure and the addition of oxidant A. And the leaching rate of chromium and iron would be 98.5% and 71.9%, respectively. The sulfuric acid leaching processes with different temperature were systematically studied by chemical analysis and phase analysis. The results showed that, with the increase of reaction temperature, the leaching rate of chromium would increase gradually, but the leaching rate of iron increased at firs

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13

Chaumba, Jeff B., and Caston T. Musa. "Geochemistry of the chromitite stringer at the contact of the mafic sequence and the ultramafic sequence in the Unki Mine area, Shurugwi Subchamber of the Great Dyke, Zimbabwe." Canadian Mineralogist 58, no. 3 (2020): 313–33. http://dx.doi.org/10.3749/canmin.1900052.

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ABSTRACT Several models have been proposed to explain the origin of a chromitite stringer located at the contact between the Mafic and Ultramafic Sequences in the Unki Mine area of the Shurugwi Subchamber of the Great Dyke, Zimbabwe. A petrographic and geochemical study of this chromitite stringer was undertaken with the aim of constraining its origin. Forty-three chromite compositions were obtained from the studied chromitite stringer, which is characterized by a chromium number between 59.9 and 62.8 and a magnesium number which ranges from 37.8 to 46.4. The chromites at the contact zone in t

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14

Lee, Yong M., and Claudia L. Nassaralla. "Heat capacities of calcium chromate and calcium chromite." Thermochimica Acta 371, no. 1-2 (2001): 1–5. http://dx.doi.org/10.1016/s0040-6031(00)00755-3.

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15

Wang, Zhaolin, Jiayong Yan, Hejun Tang, et al. "Geochemistry and Mineralogy of Peridotites and Chromitites from Zhaheba Ophiolite Complex, Eastern Junggar, NW China: Implications for the Tectonic Environment and Genesis." Minerals 13, no. 8 (2023): 1074. http://dx.doi.org/10.3390/min13081074.

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The Zhaheba ophiolite is an ocean relic of the Zhaheba-Aermantai oceanic slab, a branch of the early Paleozoic Paleo-Asian Ocean. The peridotites consist mainly of harzburgite, lherzolite and minor dunite, chromitite. This study describes the whole-rock geochemistry and mineral chemistry of the Zhaheba peridotite and chromitite for the purpose of constraining their tectonic environment and genesis. The major oxides and the trace element concentrations of the peridotites are comparable with abyssal peridotite, but fall outside the field of SSZ (suprasubduction zone) peridotite and the fore-arc

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16

Rani, M., K. Tariq, A. Younus, et al. "Sol-gel Synthesis of Nanoscaled Spinels using 1, 2-ethanediol as a Gelation Agent." Journal of Optoelectronic and Biomedical Materials 13, no. 3 (2021): 89–94. http://dx.doi.org/10.15251/jobm.2021.133.89.

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In the present work sodium chromite (NaCr2O4) based pigment was synthesized using sol gel technique. From XRD analysis, it is clear that all samples manufactured by sol gel technique have spinel structure crystallization. Also chromites with a chromium concentration (max) shows black color and Na- substituted shows green color. The samples were annealed at different temperature from 600˚C to 700˚C. The obtained nano particles were characterized by other different techniques as well such as Scanning electron microscopy, Raman spectroscopy, Photoluminence and Energy dispersive spectroscopy. The

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17

Tripathy, Sunil, Y. Murthy, Veerendra Singh, Saeed Farrokhpay, and Lev Filippov. "Improving the Quality of Ferruginous Chromite Concentrates Via Physical Separation Methods." Minerals 9, no. 11 (2019): 667. http://dx.doi.org/10.3390/min9110667.

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The low chromium-to-iron ratio of chromite ores is an important issue in some chromite deposits. The value of the chromite ore is indeed dictated in the market by its iron, as well as its chromium content. In the present study, a chromite concentrate was reprocessed by gravity (spiral concentrator) and magnetic separation to enhance the chromium-to-iron ratio. Also, detailed characterization studies including automated mineralogy were carried out to better understand the nature of the samples. Enhancing the chromium-to-iron ratio was achieved by using advanced spiral separators which will be d

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18

Nasr, Ahmed Ibrahim. "Conversion of Chromium Shaving Waste from Leather Processing into Activated Carbon." Textile & Leather Review 6 (August 3, 2023): 343–59. http://dx.doi.org/10.31881/tlr.2023.079.

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This study aimed to convert chrome shaving waste (CSW) generated from leather processing into valuable materials, such as de-chromed activated carbon and basic chromium sulphate. CSW was de-chromed using three levels of leaching solution of potassium carbonate, hydrogen peroxide, and water (0.25:0.1:5, 0.5:0.2:5, and 0.75:0.3:5, respectively), and the resulting potassium chromate was converted into basic chromium sulphate using sugar reduction method. De-chromed shaving waste (DSW) was pyrolyzed at three temperatures levels (400, 500, and 600 °C) to obtain de-chroming shaving ash (DSA), which

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19

Kanari, Ndue, Eric Allain, Lev Filippov, Seit Shallari, Frédéric Diot, and Fabrice Patisson. "Reactivity of Low-Grade Chromite Concentrates towards Chlorinating Atmospheres." Materials 13, no. 20 (2020): 4470. http://dx.doi.org/10.3390/ma13204470.

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The most economically important iron-chromium bearing minerals is chromite. In natural deposits, iron(II) is frequently substituted by magnesium(II) while chromium(III) is replaced by aluminum(III) and/or iron(III) forming a complex chromium bearing material. The majority of mined chromite is intended for the production of ferrochrome which requires a chromite concentrate with high chromium-to-iron ratio. Found mostly in the spinel chromite structure, iron cannot be removed by physical mineral processing methods. In this frame, the present work deals with the reaction of chlorine and chlorine+

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20

Fedortchouk, Yana, and William LeBarge. "Sources of placer platinum in Yukon: provenance study from detrital minerals." Canadian Journal of Earth Sciences 45, no. 8 (2008): 879–96. http://dx.doi.org/10.1139/e08-032.

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Source rocks for the platinum group minerals (PGM), historically reported in a number of Yukon placers, remain either unknown or poorly understood. A study of heavy-mineral samples from five creeks draining bedrock in west and central Yukon was undertaken to confirm the presence of placer platinum, to determine which mafic–ultramafic rock is the source of PGM in Kluane area, southern Yukon, and to explain platinum occurrences in Canadian and Florence creeks, central Yukon, where no known mafic–ultramafic rocks are present. Diverse composition of chromian spinel and clinopyroxenes from three cr

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21

Hu, X., H. Wang, L. Teng, and S. Seetharaman. "Direct chromium alloying by chromite ore with the presence of metallic iron." Journal of Mining and Metallurgy, Section B: Metallurgy 49, no. 2 (2013): 207–15. http://dx.doi.org/10.2298/jmmb120815015h.

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Direct chromium alloying by chromite ore in EAF operation is a promising process in stainless steel production, which has the advantage of resource-saving, energy-saving, and environment-friendly. In the present investigation, iron, carbon, and chromite ore mixture (Fe+C+FeCr2O4) were chosen as the precursor for direct chromium alloying. Thermogravimetric Analysis (TGA) experiments were carried out to investigate the effect of iron content on the reduction kinetics, and the results show that the presence of metallic iron in the precursor will increase the reduction rate of chromite. Up-scaling

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22

Xiao, Y. Y., L. J. Wang, S. Y. Liu, X. B. He, and K. C. Chou. "Kinetic mechanism of FeCr2O4 reduction in carbon-containing iron melt." Journal of Mining and Metallurgy, Section B: Metallurgy, no. 00 (2023): 10. http://dx.doi.org/10.2298/jmmb230215010x.

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Direct alloying of chromium by chromite attracts a lot of interest for its superiority in energy-saving and process simplification. The knowledge of chromium alloying by reduction of FeCr2O4, the main component of chromite, is key to understanding the mechanism of chromium alloying from chromite. The effect of melt composition (carbon and chromium addition) and temperature on the reduction of FeCr2O4 by carbon-containing iron melt was studied. The higher the carbon content is in the melt, the higher chromium recovery is obtained. Similarly, the higher temperature is favourable for the reductio

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23

Starks, Courtney M., Russell B. Williams, Vanessa L. Norman, et al. "Antibacterial chromene and chromane stilbenoids from Hymenocardia acida." Phytochemistry 98 (February 2014): 216–22. http://dx.doi.org/10.1016/j.phytochem.2013.11.012.

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24

Liu, Yan, Mao Fa Jiang, and De Yong Wang. "Reduction Feature and Selection Principle of Chromium Ore for Stainless Steelmaking in a Smelting Reduction Converter." Applied Mechanics and Materials 142 (November 2011): 161–64. http://dx.doi.org/10.4028/www.scientific.net/amm.142.161.

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This paper starts with the mineral structure, reducing properties of chromium ore and the physical and chemical properties of chromium oxide and discusses the requirements of the chemical composition of chromite and confirms the selection principle of chromium ore and reducing agent of chromium ore smelting reduction. The chemical compositions of the available chromite request the relatively high contents of chromium and iron, the lower contents of Al2O3, MgO and P in gangue and the lower Cr/Fe ratio in keeping with the case of high chromium. Chromoium ore in South Africa is considered to be s

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25

Kokkaliari, Maria, Karen St Seymour, Stylianos F. Tombros, and Eleni Koutsopoulou. "Study of the chromite mineralization associated to ophiolites from Tinos Island, Attico-Cycladic Massif." Bulletin of the Geological Society of Greece 55, no. 1 (2019): 185. http://dx.doi.org/10.12681/bgsg.20777.

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This paper aims to study the chromitites, as well as their host rocks (meta-peridotites, meta-dunites and serpentinites) of the ophiolite complex of Mount Tsiknias, in Tinos Island. Recognition of their mineralogy and their textural features was carried out through detailed petrographic study. The mineral chemistry analysis contributed to the evaluation of the analyzed chromites, the chemical composition of which provides important information about the petrogenetic evolution of the chromitite ores. The chromites were in equilibrium with boninite melts derived from Supra-Subduction Zone, e.g.,

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Demir, Orhan, and Rauf Hurman Eric. "Rate and Mechanism of Reduction-Dissolution of Chromite in Liquid Slags." High Temperature Materials and Processes 32, no. 3 (2013): 255–63. http://dx.doi.org/10.1515/htmp-2012-0133.

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AbstractThe dissolution of chromite from the Bushveld Complex of South Africa in liquid slags was studied in the temperature range 1550° to 1665°C under argon gas. The slag compositions were similar to those of ferrochromium production and stainless steel making. Empirical relations between the slag composition and the dissolution of chromite were established through the use of a statistical model. The dissolution process was investigated by using the rotating cylinder technique and measured by the chemical analysis of the samples taken from the melt and the SEM-EDAX analysis of the reacted ch

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27

Song, Xie-Yan, Kai-Yuan Wang, Stephen J. Barnes, Jun-Nian Yi, Lie-Meng Chen, and Louise E. Schoneveld. "Petrogenetic insights from chromite in ultramafic cumulates of the Xiarihamu intrusion, northern Tibet Plateau, China." American Mineralogist 105, no. 4 (2020): 479–97. http://dx.doi.org/10.2138/am-2020-7222.

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Abstract Chromite is one of the earliest crystallized minerals from mafic melts and has been used as an important “petrogenetic indicator.” Its composition may be modified by interaction with intercumulate melt and adjacent minerals. Thus, chromite in mafic-ultramafic rocks contains clues to the geochemical affinity, evolution, and mantle source of its parent magmas. The Devonian Xiarihamu intrusion, located in the East Kunlun Orogenic Belt in the northern Tibet Plateau, China, hosts a very large disseminated Ni-Co sulfide deposit. This study focuses on geochemistry of the chromite enclosed in

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28

Rakhimov, Ildar R., Dmitri E. Saveliev, Mikhail A. Rassomakhin, and Aidar A. Samigullin. "Chromian Spinels from Kazanian-Stage Placers in the Southern Pre-Urals, Bashkiria, Russia: Morphological and Chemical Features and Evidence for Provenance." Minerals 12, no. 7 (2022): 849. http://dx.doi.org/10.3390/min12070849.

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Six minor alluvial chromite placers (Kolkhoznyi Prud, Verkhne-Yaushevo, Sukhoy Izyak, Bazilevo, Novomikhaylovka, Kiryushkino) and one major littoral placer (Sabantuy) were found in sandy sediments of the Kazanian stage of the Permian System (Late Roadian and Wordian Stages) in the Southern Pre-Urals. It is shown that the morphological features of chromian spinels are diverse, which is not evidence of the heterogeneity of the source. The bulk chemical composition of chromian spinels from all placers is similar and generally correlates with compositions of chromian spinels from the Kraka ophioli

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29

Ge, X., S. Jin, M. Zhang, X. Wang, and S. Seetharaman. "Synthesis of chromium and ferrochromium alloy in molten salts by the electro-reduction method." Journal of Mining and Metallurgy, Section B: Metallurgy 51, no. 2 (2015): 185–91. http://dx.doi.org/10.2298/jmmb141222022g.

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In this work, we successfully applied the Fray-Farthing-Chen Cambridge electro-reduction process on the preparation of chromium from chromium oxide, and for the first time, the synthesis of ferrochromium alloy from chromium oxide and iron oxide mixture and the chromite ore in molten calcium chloride. The present work systematically investigated the influences of sintered temperature of the solid precursor, electrochemical potential, electrolysis temperature and time on the products by using a set of advanced characterization techniques, including XRD and SEM/EDS analyses. In particular, our re

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30

Ye, Jin Ling, and Feng Ye. "Effects of Strong Carbide-Forming Elements on Low Temperature Salt-Bath Chromizing." Advanced Materials Research 214 (February 2011): 646–50. http://dx.doi.org/10.4028/www.scientific.net/amr.214.646.

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The microstructure, phase structure, white layer thickness and chromium concentration, microhardness of the chromized layer of T10 steel and 3Cr2W8V steel by low temperature salt-bath chromizing with plasma nitriding are contrasted. The chromizing process is investigated by means of optical microscopy (OM), scanning electron microscopy (SEM), X-ray diffraction (XRD). Results show that the strong carbide-forming elements (Cr, W, V) obstruct the diffusion of chromium and carbon, the white layer thickness and microhardness, surface chromium concentration of the chromized layer are reduced. A chro

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31

Barber, Kevin N., Cory K. Perkins, and Allen W. Apblett. "Reduction of chromate by molybdenum hydrogen bronze." Canadian Journal of Chemistry 94, no. 4 (2016): 401–5. http://dx.doi.org/10.1139/cjc-2015-0381.

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Molybdenum hydrogen bronze, H0.57MoO3, is capable of removing up to 80 mequiv./g chromate from aqueous solution. The redox process is accompanied by adsorption of the reduced chromium species so that the chromium is completely removed from solution. Chromate removal was only weakly dependent on pH, being slightly favored at acidic pH. The kinetics appear to involve the rapid adsorption of chromate in an equilibrium process that is followed by reduction of the chromium(VI). The rate constant was found to be first order in chromate and the amount of suspended H0.57MoO3 with a rate constant of 1.

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Atasoy, Ahmet, and F. R. Sale. "An Investigation on the Solid State Reduction of Chromite Concentrate." Solid State Phenomena 147-149 (January 2009): 752–57. http://dx.doi.org/10.4028/www.scientific.net/ssp.147-149.752.

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In this article, Turkish chromite concentrate was reduced with metallurgical coke at temperature between 1000-1500 °C with variables reducing times. The reduction mechanism and the microstructure of the reduced chromite were investigated. There were closer relationships between the reduction of chromite and the sample morphology, such as, the surface area and the porosities and cracks of the particle have positive effect on the metallization of iron and chromium oxides. The reduction of the iron chromite spinel started at 1000 °C, but picrochromite started to reduce at temperature around 1300

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Turakulov, Bakhriddin, Kurmanbek Zhantasov, Alexandr Kolesnikov, Bakyt Smailov, and Yury Liseitsev. "Research on the Production of Pigments Based on Composite Pellets in the Recycling of Industrial Waste." Journal of Composites Science 7, no. 7 (2023): 289. http://dx.doi.org/10.3390/jcs7070289.

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This article presents the complex processing of low-grade and substandard chromium ores, as well as sludge tailings, with the production of composite chromium-containing materials and pigments, while improving environmental performance in the Republic of Kazakhstan through the utilization and processing of technogenic raw materials. In this work, to study the physicochemical properties of the starting materials, modern analytical, thermodynamic, chemical, granulometric, as well as computational, mathematical, laboratory, and experimental methods were used. In particular, studies of a method fo

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34

Bjerg, Ernesto A., Milka K. De Brodtkorb, and Eugen F. Stumpfl. "Compositional zoning in Zn-chromites from the Cordillera Frontal Range, Argentina." Mineralogical Magazine 57, no. 386 (1993): 131–39. http://dx.doi.org/10.1180/minmag.1993.057.386.13.

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AbstractSerpentinised ultramafic bodies containing zoned chromite grains occur in the Cordillera Frontal Range, western Argentina. Chromites show Zn-rich Al-chromite cores (4.04 wt.% ZnO) surrounded by ferritchromite rims (1.3 wt.% ZnO) and outer Cr-magnetite rims. In intensely altered chromites which are spatially related to sulphide mineralisation, the primary chromite cores have been replaced by Zn-rich ferritchromit (7 wt.% ZnO) and they are rimmed by Cr-magnetite. In the Al-chromites the mean [Cr/(Cr + Al] ratio is 0.53 and the [Mg/(Mg + Fe)] ratio is 0.53; they plot in the field of Alpin

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35

Jacob, K. T., G. M. Kale, and K. P. Abraham. "Electrochemical Determination of Gibbs Energies of Formation of Calcium Chromite and Chromate." Journal of The Electrochemical Society 139, no. 2 (1992): 517–20. http://dx.doi.org/10.1149/1.2069248.

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36

Matern, K., and T. Mansfeldt. "Chromate adsorption from chromite ore processing residue eluates by three Indian soils." Environmental Chemistry 13, no. 4 (2016): 674. http://dx.doi.org/10.1071/en15147.

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Environmental context Chromate (CrO42–)-containing waste is illegally dumped in some places in the state of Uttar Pradesh, north India, although CrO42– is known to be toxic and carcinogenic. Because CrO42– is leached from the landfills, this study investigated the adsorption of CrO42– by soils. The results indicated that CrO42– is highly leachable and adsorption is inhibited, which leads to contamination of the groundwater and drinking water in this area. Abstract Chromite ore processing residue (COPR) is a harmful waste of the chromate (CrO42–) extraction roasting process. Nevertheless, depos

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37

Dyussenova, S., B. Kenzhaliyev, R. Abdulvaliyev, and S. Gladyshev. "The method of processing technogenic tailings of chromium." Journal of Mining and Metallurgy A: Mining 56, no. 1 (2020): 15–22. http://dx.doi.org/10.5937/jmma2001015d.

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Taking into account the existing demand for chromium concentrates, the extraction of chromium from technogenic formations of sludge storages of the tailings of chromium ore beneficiation is an important practical task. The comprehensive utilization of beneficiation sludge will increase the profitability of production and solve the environmental problems of the region. The importance of solving the problem of involving in processing tailings is connected not only with the environment but also with the need to increase the production of chromium. Modern gravity enrichment technologies make it po

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Iwata, Naoki, and Susumu Kitanaka. "New Cannabinoid-Like Chromane and Chromene Derivatives from Rhododendron anthopogonoides." CHEMICAL & PHARMACEUTICAL BULLETIN 59, no. 11 (2011): 1409–12. http://dx.doi.org/10.1248/cpb.59.1409.

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Christiansen, F. G., and N. Ø. Olesen. "Large skeletal chromites in the Vourinos ophiolite, Greece." Bulletin of the Geological Society of Denmark 38 (April 25, 1990): 33–42. http://dx.doi.org/10.37570/bgsd-1990-38-03.

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Exceptionally large skeletal chromites, up to several cm across, from harzburgite veins in the Vourinos ophiolite, Greece have been described in detail using microstructural and fabric methods of silicate minerals combined with S. E. M. studies of chromite. Inferred from olivine fabric data, the harzburgite veins with the skeletal chromites have suffered only minor deformation (both in the ductile and brittle regime) compared to the highly deformed dunite host rock. The S. E. M. observations (electron channeling patterns) demonstrate (1) the large grain size of the chromite and (2) that the nu

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40

Setthayanond, Jantip, Porntip Sae-Bae, Podjanalak Chaiyapongputti, and Phussadee Lim. "Chromium (VI) Adsorption Study Using Bio-Adsorbent Material Derived from Tamarind-Seed Testa." Key Engineering Materials 723 (December 2016): 534–39. http://dx.doi.org/10.4028/www.scientific.net/kem.723.534.

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In this research, the chromium (VI) adsorption in potassium chromate (K2CrO4) and potassium dichromate (K2Cr2O7) was studied with the low-cost adsorbent derived from sweet tamarind seeds obtained from the food processing industry in Thailand. The tamarind-seed testa was prepared by decoloring the tamarind-seed husks in boiling water and 1% NaOH solution followed by bleaching in H2O2 solution. The major components found in the tamarind-seed testa were alkali hydrolysable, low molecular-weight carbohydrates. The study found that the adsorbent material derived from tamarind–seed testa could well

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Memon, Shahabuddin, D. Max Roundhill, and Mustafa Yilmaz. "Remediation and Liquid-Liquid Phase Transfer Extraction of Chromium(VI). A Review." Collection of Czechoslovak Chemical Communications 69, no. 6 (2004): 1231–50. http://dx.doi.org/10.1135/cccc20041231.

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Chromium(VI) is a widely used industrial chemical, and is generally considered to pose a greatest human health risk because it is more toxic, more soluble, and more mobile than chromium(III). Workers in industries that use chromium, in particular stainless steel welding, chromate production, chromium plating, and chrome pigment industries, where exposure via inhalation of aerosols is primarily to hexavalent chromium, are at increased risk of chromium effects. In this article we demonstrate various studies regarding remediation methods in particular liquid-liquid extraction of chromate and dich

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Saeed, Muhammad, Malika Rani, Kiran Batool, et al. "Synthesis and Fabrication of Co1−xNixCr2O4 Chromate Nanoparticles and the Effect of Ni Concentration on Their Bandgap, Structure, and Optical Properties." Journal of Composites Science 5, no. 9 (2021): 247. http://dx.doi.org/10.3390/jcs5090247.

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In the present work, cobalt-chromite-based pigment Co1-xNixCr2O4 chromate powder and nanoparticles with various transition metal concentrations (x = 0.2, 0.4, 0.6, and 0.8) were manufactured by applying aqueous synthesis approaches and sol–gel synthesis routes. XRD analysis of the powder shows that all samples formulated by the sol–gel method were crystalline with a spinel structure. Chromites show green color with a higher nickel concentration, while Co-substituent shows blackish pigments. Samples were annealed at distinct temperatures ranging from 600 °C to 750 °C. The nanoparticles obtained

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V. H. Martirosyan, M. E. Sasuntsyan, and V. V. Savich. "OBTAINING OF FERROSILICOCHROMIUM POWDER ALLOY BY SILICOTHERMIC REDUCTION AND STUDY OF THE MECHANISM OF THIS PROCESS." International Academy Journal Web of Scholar 1, no. 1(31) (2019): 11–17. http://dx.doi.org/10.31435/rsglobal_wos/31012019/6307.

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    The process of obtaining a powder ferrosilicochromic alloy by the method of silicothermic reduction of local chromites and slags of copper smelters was investigated. The mechanism of this process has been studied. It is established that the best results are obtained in the case of slag / chromite ratio = 1: 1, when an alloy with microdispersed structure and high strength is obtained. The optimum composition of the resulting alloy is as follows: 35,1% Fe; 36,35% Si and 28,53% Cr, with a metal yield of 98,4%. The obtained alloy powder can be used as an acidified and a

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Fujie, Koichi, Tomohiko Tsuchida, Kohei Urano, and Hisao Ohtake. "DEVELOPMENT OF A BIOREACTOR SYSTEM FOR THE TREATMENT OF CHROMATE WASTEWATER USING ENTEROBACTER CLOACAE HO1." Water Science and Technology 30, no. 3 (1994): 235–43. http://dx.doi.org/10.2166/wst.1994.0110.

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A novel bioreactor system was developed for tbe simultaneous treatment of toxic and mutagenic hexavalent chromium (chromate) and high strengtb organic pollutants by introducing chromate-resistant and chromatereducing bacteria Enterobacter cloacae strain HO1. Growth and chromate reducing characteristics of E. cloacae HO1 were extensively investigated to setup the bioreactor system and to clarify the optimal operating conditions of it. To enrich active E. cloacae HO1 in the bioreactor, the aerated cultivation with oxidation-reduction potential (ORP) control was successfully applied. Chromate and

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Fébel, Hedvig, B. Szegedi, and Szilvia Huszár. "Absorption of inorganic, trivalent and hexavalent chromium following oral and intrajejunal doses in rats." Acta Veterinaria Hungarica 49, no. 2 (2001): 203–9. http://dx.doi.org/10.1556/004.49.2001.2.10.

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The intestinal absorption of trivalent and hexavalent chromium (Cr) given orally (experiment I) or infused in the intestine (experiment II) was investigated in rats. The nonabsorbable form of chromium (51Cr2O3) and water-soluble and more absorbable Na251CrO4 (the hexavalent form of Cr) were compared. Total retention of chromium given orally ranged around 15 percent of the dose, regardless of the chromium compounds applied. The absorption rate of chromic oxide, which is considered a nonabsorbable compound, was 14.4 as a percentage of chromium intake. This result indicates that some loss of chro

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Salarzadeh, I., and SA Tariq. "The Reactions of 11 Compounds of Copper, Silver and Chromium With the Molten Lithium-Sodium-Potassium Carbonate Eutectic." Australian Journal of Chemistry 39, no. 7 (1986): 1119. http://dx.doi.org/10.1071/ch9861119.

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The reactions of Cu2Cl2, CuCl2, AgCl , AgNO3, CrCl2, CrCl3, Cr2O3, K2CrO4, K2Cr2O7, K2Cr3O10 and CrO3 with the molten lithium-sodium-potassium carbonate eutectic were investigated under argon as well as carbon dioxide atmospheres. Copper(I) and copper(II) chlorides reacted to produce CuO with the evolution of CO and CO2 respectively. The silver compounds reacted to produce silver metal and a mixture of O2 and CO2. Chromium(II) and chromium(III) chlorides and Cr2O3 were converted into alkali-metal chromate(III) species. Potassium chromate(VI) was found to be stable in the eutectic. Chromium(VI)

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Colás, Vanessa, Ignacio Subías, José María González-Jiménez, et al. "Metamorphic fingerprints of Fe-rich chromitites from the Eastern Pampean Ranges, Argentina." Boletín de la Sociedad Geológica Mexicana 72, no. 3 (2020): A080420. http://dx.doi.org/10.18268/bsgm2020v72n3a080420.

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Chromitites hosted in the serpentinized harzburgite bodies from Los Congos and Los Guanacos (Eastern Pampean Ranges, north Argentina) record a complex metamorphic evolution. The hydration of chromitites during the retrograde metamorphism, their subsequent dehydration during the prograde metamorphism and the later-stage cooling, have resulted in a threefold alteration of chromite: i) Type I is characterized by homogeneous Fe3+- and Cr-rich chromite; ii) Type II chromite contains exsolved textures that consist in blebs and fine lamellae of a magnetite-rich phase hosted in a spinel-rich phase; ii

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Prasad, Sanjay, Manoj Kumar, and N. S. Randhawa. "Processing of Chromite Overburden by Soda Roasting to Recover Chromium as Sodium Chromate." Transactions of the Indian Institute of Metals 74, no. 9 (2021): 2221–30. http://dx.doi.org/10.1007/s12666-021-02320-8.

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Yildiz, Kenan, and I. Ayhan Sengil. "Investigation of efficient conditions for chromate production from chromite concentrate by alkali fusion." Scandinavian Journal of Metallurgy 33, no. 4 (2004): 251–56. http://dx.doi.org/10.1111/j.1600-0692.2004.00694.x.

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Wang, Y., L. Wang, J. Yu, and K. C. Chou. "Kinetics of carbothermic reduction of synthetic chromite." Journal of Mining and Metallurgy, Section B: Metallurgy 50, no. 1 (2014): 15–21. http://dx.doi.org/10.2298/jmmb130125008w.

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In order to optimize the current reduction process of chromite, a good knowledge of reduction mechanism involved is required. The basic component in chromite ore is FeCr2O4, thus, kinetic investigation of synthetic FeCr2O4 with different amount of carbon were carried out in the temperature range of 1473K to 1673K under both isothermal and non-isothermal mode. The iron can be easily reduced compared with chromium. And higher reduction degree of chromite can be achieved by increasing temperature and carbon content. With the supporting of X-ray Diffraction and Scanning Electron Microscope methods

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