A new metallurgical process for the clean utilization of chromite ore …
The chromite ore samples exploited from Philippines were obtained from Bluestar Yima Chrome Chemical Materials Co. Ltd., PR China. The chemical analysis of a typical sample by ICP-OES was given in Table 1.Prior to the experiments, the sample was crushed and dry-sieved to four particle-size fractions (0.045–0.063, 0.063–0.075, …
(PDF) Fluxing of South African chromite ore with colemanite
South African chromite ores are smelted using SiO2- and CaO-containing fluxes, normally as quartz and limestone respectively. The purpose of SiO2 is to lower …
Mechanism of the Direct Reduction of Chromite Process as a …
In DRC, chromium (Cr) and iron (Fe) from chromite ore incongruently dissolve into a molten salt, which facilitates mass transfer to a carbon (C) reductant where in situ …
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 …
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, …
Chrome ore beneficiation challenges & opportunities – A …
Abstract. Supply of world chromite (chrome ore) has come under severe pressure over the past year driven by strong demand for ferrochrome used in ferroalloy production for making stainless steel. Many of the strategic minerals are inputs into products in fast-changing markets. This article reviews the major process flow sheets in practice …
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 …
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 the charge, as it descends…. Expand. 21. PDF. Semantic Scholar extracted view of "Effects of flux additions on the kinetics of chromite ore reduction with carbon" by D ...
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).
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 …
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 ...
Chromite Ore Processing Residue in Hudson County, New …
Abstract and Figures. 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 ...
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 …
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 …
Chromium steel from chromite ore processing residue
T1 - Chromium steel from chromite ore processing residue - A valuable construction material from a waste. AU - Meegoda, Jay N. AU - Kamolpornwijit, Wiwat. N1 - Funding Information: Acknowledgements The work described in this study was supported by a research contract from the New Jersey Department of Environmental Protection.
Solidification/stabilization of chromite ore processing …
In another study, alkali-activated optimized blends of 80 % blast furnace slag and 20 % fly ash were used to solidify 40 % of chromite ore processing residue with minimized leaching of 1.490 mg/L ...
Extraction of Chromium from Chromite Ore
The average grade of the metallurgical chromite ore was 43.4 pct Cr2O3, with 52 pct of the ore having a chromium-to-iron ratio of 3:1 or over, 17.6 pct having a ratio between 2:1 and 3:1, and 30.4 pct having a ratio less than 2:1. Chemical-grade chromite ore generally ranged from 40 to 46 pct Cr2O3 with a chromium-to-iron ratio of 1.5:1 to 2:1.
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 ...
Microstructural analyses of Cr(VI) speciation in chromite ore
1. Introduction. Chromite Ore Processing Residue (COPR) is a solid waste generated during the high temperature (∼1200 °C) roasting process that is used to extract chromium from chromite ore (Antony et al., 2006).Lime-based roasting has been the prevalent method to complex other metals in ore (Fe, Mg, Al) and isolate Cr.
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
Chromite Beneficiation Process
The Problem with Chromite Processing Experience indicates that chrome ores are concentrated to best advantage by gravity methods. Since recoveries are generally very poor in the fine sizes, the gravity flowsheet must be designed to remove the chrome as soon as liberated by crushing and grinding. For example, if the chrome is not entirely …
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 …
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 ...
KPMG commodity insights bulletin chromite
Chromite. Chromite is the commercial name of iron chromium oxide (FeCr2O4), a mineral comprised of chromium and iron oxide that is naturally found in the earth's mantle. When extracted, it is referred to as chrome ore. Chromite is crucial for the production of ferrochrome, an alloying agent in manufacturing stainless steel.
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 …
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 …
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
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 …
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 ...
An Overview of Currently Applied Ferrochrome …
>70% of the global viable chromite ore reserves [9,10,14,15]. More so, in 2012, chromite originating from South Africa accounted for 41% of globally mined ore. It is estimated that in the same year, 55% of the approximate 10 million tons of chromite mined in South Africa was exported, which suggests that 28% of globally smelted chromite ore ...