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Prolonged development of ore deposits, ore beneficiation and metallurgical smelting of concentrates result in the accumulation of wastes, forming large-scale dumps and sludge ponds...
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Abstract: Prolonged development of ore deposits, ore beneficiation and metallurgical smelting of concentrates result in the accumulation of wastes, forming large-scale dumps and sludge …
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In the present study, the tailings generated from a chromite ore beneficiary plant in India were investigated through a pyro-metallurgical route. The initial characterization confirmed the presence of nickel (0.5–0.9% Ni) in the ore, which led to the interest in smelting the ore to obtain nickel in the metal.
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The average compressive strength of 3 wt% sodium silicate-3 wt% SiO2-1, 2, 4, 6 M KOH pellets cured at 75 °C. The reference (shown by a solid red line) represents 32-day air-dried pellets bonded ...
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alloy by smelting process of waste chromite ore fines using plasma smelting route. The subject of this work is to study the effect of plasma environment, charge chemistry, and plasma exposure time on the recovery of chromium and nickel from chromite ore and absorption of nitrogen from the plasma environment. 2 Experimental 2.1 Materials The ...
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Chromite ore processing residue (COPR) is a by-product generated after the leaching of sodium chromate by roasting chromite ore at 1200 °C. However, the residual 1130–8500 mg/kg of highly toxic Cr(VI) in COPR poses a severe threat to the ecosystems ( Du and Chrysochoou, 2018, Xia et al., 2020, Molinari et al., 2021, Guleria et al., 2022 ).
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The experimental conditions and final plasma smelting products of Ghutrigaon chromite ore are mentioned in Tables 1 and 2. Cr and Fe contents in the ferrochrome globules and different elements present in the slag were determined through in situ electron microprobe analysis. ... The results reveal that the low-grade siliceous chromite ore from ...
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In this decade, various research activities have been devoted to the production of high carbon ferrochromium or crude stainless steel by the smelting reduction of chromite ore in an advanced oxygen converter. Likewise, various technologies have been developed for the reduction of chromite ore without the use of electrical energy as a heat source.
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There is no point smelting a chromite ore if breakeven cannot be achieved. During chromite smelting, energy requirement and its cost depend to a large extent on the technology used in smelting the ore. New process technologies have been developed to reduce energy required for smelting chromite to ferrochrome.
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Valorization From Waste: Combined Reduction of Chromite Ore Processing Tailing and Sub‑Grade Manganese Ore to Produce 200 ... In this study, the focus lies on smelting these ores together, aiming to create a precursor alloy for 200 series stainless steel scrap. Initial research indicated the potential for scrap formation, validated through ...
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about V. X wt.%. As a result, the common assumption that the chromite ores contain Cr only in chromite is misleading, because chromite in metamorphosed ores may be con-tained in significant amounts in gangue phases of the ore and especially in Cr-chlorite. The effect of such redistribution on the beneficiation of chromite ores has been experimen-
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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.
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Request PDF | On Jan 1, 2025, Xiaohong Chen and others published Copper slag-aided mechanochemical detoxification soda ash chromite ore processing residue and long-term stabilization: Efficient ...
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The smelting of chromite to produce ferrochrome (FeCr) and subsequently, stainless steel, is an energy-intensive carbothermic process. Various countries apply the Outotec FeCr process, which employs oxidative …
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The chromium recovery at 30-min exposure time under hydrogen plasma and by addition of carbon under hydrogen plasma is shown in Fig. 3a. It is observed that no significant recovery (14.73%) of chromium has occurred in the case of hydrogen plasma without carbon, whereas it improves significantly (60%) …
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The present study is possibly the first of its kind related to production of crude stainless steel melt by direct smelting of chromium and nickel ore without use of ferrochromium and ferronickel alloys.
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Lead–zinc smelting slag (LZSS) is regarded as a hazardous waste containing heavy metals that poses a significant threat to the environment. LZSS is rich in aluminosilicate, which has the ...
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The chromium (Cr) content of stainless steel originates from recycled scrap and/or ferrochrome (FeCr), which is mainly produced by the carbothermic reduction of chromite ore. Ever-increasing pressure on FeCr producers to curtail carbon emissions justifies migration from traditional FeCr production routes. The interaction between hydrogen and chromite only yields …
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Prolonged development of ore deposits, ore beneficiation and metallurgical smelting of concentrates result in the accumulation of wastes, forming large-scale dumps and sludge ponds negatively ...
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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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In current research work, authors have tried to smelt the mixture of low-grade chromite ore and sub-grade manganese ore, dumped as waste, with carbon. The process is …
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Smelting reduction of chromite ore was studied in systems and conditions related to ferrochromium production in submerged arc furnace. Dissolution of chromite pellets or lumpy ore as well as reduction of iron, chromium and silicon oxide were studied by immersing chromite samples in a slag melt in a graphite crucible.
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Lead–zinc smelting slag (LZSS) is regarded as a hazardous waste containing heavy metals that poses a significant threat to the environment. LZSS is rich in aluminosilicate, which has the potential to prepare alkali-activated materials and solidify hazardous waste, realizing hazardous waste cotreatment. In this study, the experiment included two parts; i.e., …
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Waste molasses was proved an efficient and low cost Cr (VI) reductants. Fe in COPR is recovery by magnetic separation in the form of magnesioferrite.
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Abstract The low-grade siliceous chromite ore from Ghutrigaon, Odisha, India, containing * 16% Cr 2O 3, with Cr/Fe ratio of 1.97 and * 55% of SiO 2, does not find any use in metallurgical industry and hence considered as waste. Mineralogical investigation indicates the presence of chromite and quartz as major minerals with minor fuchsite and ...
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Due to the fast development of the nonferrous metal industry, much higher levels of smelting residues were produced, and most smelting residues previously were dumped without safe disposal [1,2,3]. The long-term storage of massive smelting waste causes great damage to the ecosystem and threatens human health [4,5]. Therefore, the treatment and ...
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Ferrous waste by-products from the metallurgical industry have a high potential for valorization in the context of the circular economy, and can be converted to value-added products used in environmental remediation. ... 12, 534. [CrossRef] 142. Dishwar, R.K.; Agrawal, S.; Mandal, A.K.; Sinha, O. Smelting process of chromite ore fines to ...
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Chromite ore processing residue (COPR) is a kind of hazardous waste because of the existence of highly leachable and carcinogenic hexavalent chromium (Cr(vi)), which is generated during chromium salt production.While chromium salt is an important strategic resource which is widely used in electroplating, tanning, chemical reagents, wood preservatives, …
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The aim of this work is to develop a non-waste production technology for the complex processing of waste chrome ore gravity concentrations by chemical enrichment …
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Attempts to improve the recovery or chromium production have focused on the smelting process. In some cases, losses of chromium to the slag in the form of metal drops, small particles of …
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