Fusion of Chromite Ore Using Sodium Phosphate Salt as Flux …
In hydrometallurgy, fusion techniques are considered key in the processing of chromite ore. Salts containing easily ionized elements are often used as flux, which results in solutions with ...
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Fluxing of South African chromite ore with colemanite
Chromite ores in South Africa (SA) originate mainly from the Bushveld Complex. Broadly, the MG1, MG2, and LG6 seams in the complex are mined to produce feed for chromite smelting, while the UG2 seam is mined as a source of platinum group metals (PGMs). The 'discard' streams from UG2 ore processing have become a valuable raw
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Microwave and Conventional Carbothermic Reduction of Chromite Ore…
Materials. The chromite ore used in this study contained 40.98 wt% Cr 2 O 3, 19.04 wt% FeO, 13.05 wt%Al 2 O 3, and 3.35 wt% MgO with the mass ratio of Cr/Fe of 1.29, as shown in Table 1.The main phases of chromite ore were chromite ((Mg,Fe)(Cr,Al,Fe) 2 O 4), and enstatite (MgSiO 3), as shown in Fig. 1.Coke having 84.81 …
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Valorization From Waste: Combined Reduction of Chromite Ore Processing
Chromite ore processing tailings and low-grade manganese ores are typically considered waste due to their limited or negligible utility, leading to environmental and storage concerns. Researchers globally have explored various methods to utilize or upgrade these wastes, particularly because dumping chromite ore has been linked to …
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Chromium steel from chromite ore processing residue
As species we humans generate excessive amounts of waste and hence for sustainability we should explore innovative ways to recover them. The primary objective of this study is to demonstrate an efficient and optimum way to recover chromium and iron from chromite ore processing residues (COPR) for the production of chrome steel and …
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Physical Chemistry of Roasting and Leaching Reactions for …
This chapter contains sections titled: Introduction Crystal Structure of Chromite Minerals Thermal Decomposition of Chromites Alkali Roasting of Chromites Leaching of Chromite Minerals Ch...
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Chromite Ore Processing Residue Solidified Products …
1 Supplementary Material Research on Environmental Stability Performance of Chromite Ore Processing Residue Solidified Products Ming Xia a,b,c*, Pengyue Su a, Hao Wang a, Huicheng Lu a, Haiyu Chen a, Shujie Zhao d*, Dongwei Li e * a School of Environmental and Chemical Engineering, Jiangsu Ocean University, Lianyungang, 222005, China
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Smelting Process of Chromite Ore Fines to Produce Crude …
The smelting behavior of waste chromite ore fines containing Cr and Ni to produce crude Fe–Cr–Ni–N alloy was investigated in this study. In the experiments, for each heat, liquid steel melt (metal pool 1 kg) was prepared in a 3--capacity laboratory-scale electric arc furnace for the absorption of reduced metals like chromium, nickel, etc., …
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Fluxing of South African chromite ore with colemanite
South African chromite ores and concentrates are blended to obtain a Cr/Fe ratio that is high enough to produce 'charge chrome', a special grade of high-carbon ferrochromium …
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Remediation of Cr(VI)-contaminated soil mixed with chromite ore …
Chromite ore processing residue (COPR) is a major contaminant of Cr(VI)-contaminated soil. It is a by-product of chromium salt during the lime-based roasting process, which was estimated to be nearly 6 million tons in 2004 and has increased by 60,000 tons annually in China (Liu et al., 2020).
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Pilot Tests of Pre-Reduction in Chromium Raw Materials from Donskoy Ore
Experiments were conducted to pilot the initial reduction in chromium raw materials using the innovative Hoganas technology in a tunnel furnace. To simulate the process, a gas-fired bogie hearth furnace was employed. Technological containers made of silicon carbide crucibles were utilized. Sixteen different combinations of ore and coal …
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Effects of flux additions on the kinetics of chromite ore …
This paper provides a review of the chemical reactions occurring in the submerged arc processing of chromite ores. The excavations of industrial furnaces have shown that …
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(PDF) Fluxing of South African chromite ore with colemanite …
It consists of both SiO2 and CaO, and can be used in small quantities to flux chromite ore. Laboratory tests done in Mintek indicated that it is feasible to reduce processing temperatures in the ...
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Fluxing of South African chromite ore with colemanite
South African chromite ores are smelted using SiO 2 - and CaO-containing fluxes, normally as quartz and limestone respectively. The purpose of SiO 2 is to lower the melting point of the ore, while CaO is added to ensure that the slag that forms on smelting is fluid …
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Chromite Ore Processing Residue in Hudson County, …
Chromite ore processing residue occurs at over 130 sites in Hudson County, New Jersey. Many. of these sites are in urban residential areas. This waste is a result of 70 years of chromate and bichromate chemical manufacturing. At least 15% of the sites contain total chromium concen- trations greater than 10,000 mg/kg, with hexavalent content ...
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Beneficiation of South African chromite tailings using
In this project, chromite tailings from Western Limb of the South African Bushveld Igneous Complex (BIC) was characterised with the objective of recovering fine and ultrafine chromite using wet magnetic separation process. 2. Materials and Methods. Chromite tailings ore sample was obtained from a MG chromite processing plant in the Western …
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Chromium steel from chromite ore processing residue
Chromium steel from chromite ore processing residue — A valuable construction material from a waste June 2011 Frontiers of Environmental Science & Engineering in China 5(2):159-166
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Fusion of Chromite Ore Using Sodium Phosphate Salt as …
MATERIAL (SARM 131) Chromite Sample The metallurgical-grade chromite ore sample was obtained from a PGE processing plant in Rusten-burg South Africa, situated on the Western limb of the Bushveld complex. The ore (particle size< 75 lm) was processed through physical and chemical steps (not supplied) designated for ferrochrome smelters.
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Smelting of High-Carbon Ferrochrome from Prereduced Chromite …
Experimental smelting of three batches of prereduced chromite raw materials with different degrees of metallization of chromium was conducted in the 0.2 MVA ore-smelting furnace of the Chemical ...
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Long-Term Leaching Behavior of Chromite Ore Processing …
Leaching characteristics of chromium ore processing residue (COPR) for the long term (simulating a 20-year leaching scenario) were investigated using laboratory flow-through column testing with ...
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A Decarbonization Approach for FeCr Production
In this study, the reducing smelting of chromite concentrates by EAF-assisted metallothermic method was investigated. The effect of AlPowder and AlDross addition amount, time, and the ratio of flux addition on the produced metal and slag compositions and metal recovery were investigated. It was seen that ferrochrome can be …
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Detoxification and immobilization of chromite ore processing …
Reduction/immobilization of chromite ore processing residue using composite materials based geopolymer coupled with zero-valent iron Ceram. Int., 44 ( 2018 ), pp. 3454 - 3463, 10.1016/j.ceramint.2017.11.148
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Prereduction of Chromite Raw Materials by the Höganäs …
Pilot industrial tests of the prereduction of chromium raw materials using the Höganäs technology in a tunnel furnace were carried out. A bogie-hearth chamber furnace fired with natural gas was used to simulate the process. Silicon-carbide crucibles were used as process containers. For prereduction, 16 ore–coal mixtures with a total mass of more …
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Fusion of Chromite Ore Using Sodium Phosphate Salt as Flux …
In hydrometallurgy, fusion techniques are considered key in the processing of chromite ore. Salts containing easily ionized elements are often used as flux, which results in …
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Smelting of High-Carbon Ferrochrome from Prereduced …
To assess the performance indicators of the remelting of prereduced chromite raw materials in industrial direct-current furnaces, a batch of base charge …
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Melting Ferrochrome Using Chrome-Ore Briquettes
Test-industrial experience has demonstrated that solution of the problem of processing high-magnesia chromite raw material should be aimed at finding the …
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Electric Resistivity of Fine Chromite Ore
Electric Resistivity of Fine Chromite Ore. Cheng Pan, Cheng Pan [email protected] College of Materials Science & Engineering, Chongqing University, Chongqing 400044, China. Search for more papers by this author. Xuewei Lv, Xuewei Lv [email protected] College of Materials Science & Engineering, Chongqing University, …
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Minerals | Free Full-Text | An Overview of Currently Applied
Depending on the furnace type and raw material prerequisites, undersized materials may be screened out from raw material streams. The furnace feed materials …
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Chromite
Ferrochrome is made by smelting chromite ore in an electric arc furnace with flux materials (quartz, dolomite, limestone, and aluminosilicates) and a carbonaceous reductant (wood chips, coke, or charcoal) ... the use of chromite ore-processing residue (COPR) as a fill material has been banned owing to its classification as a hazardous …
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Leaching of hexavalent chromium from young chromite ore processing
Chromite ore processing residue (COPR) is a waste derived from the chromate extraction from roasted ores and is deposited in some countries in landfills. The objective of this study was to investigate the leaching characteristics of hexavalent Cr [Cr(VI)] from two COPR samples obtained from unlined landfills in the Kanpur area of …
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