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reduction of chromite ore

reduction of chromite ore

  • Reduction and immobilization of chromate in chromite ore

    May 15, 20120183;32;Chromite ore processing residue (COPR) poses a great environmental and health risk with persistent Cr(VI) leaching. To reduce Cr(VI) and subsequently immobilize in the solid matrix, COPR was incubated with nanoscale zero valent iron (nZVI) and

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  • (PDF) Carbothermic Reduction of Chromite Ore Under

    The reduction of chromite ore with carbon has been studied extensively in many laboratories. Inert gases have been used in these investigations to control the experimental conditions.

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  • Studies on Carbothermic Reduction of Chromite in the

    reduction of chromite; the Cr yield from chromite ore increases when increased amounts of FeOx are added. Chromite ore + mill scale + carbonaceous materials can be potentially used to directly alloy steels with Cr; chromite ore + magnetite + carbonaceous materials can be potentially used to produce Cr pre alloyed iron powder

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  • REDUCTION OF CHROMITE FINES IN pyrometallurgy

    For the run, 12.5 pounds of chromite ore fines ground to below 75 microns were loaded into the unit. Nitrogen was used to fluidize the material at a linear velocity of 20ft/min. The reactor was lowered into the fluidized bed furnace at ambient temperature. The furnace was then heated to

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  • Reduction and immobilization of chromate in chromite ore

    May 15, 20120183;32;Reduction and immobilization of chromate in chromite ore processing residue with nanoscale zero valent iron Author links open overlay panel Jingjing Du a Jinsuo Lu b Qiong Wu a Chuanyong Jing a Show more

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  • Production Smelting Technologies for Ferrochromium

    As a result the high carbon ferrochromium has become the most widely produced and consumed grade of chromium containing ferroalloys. The produc tion of high carbon ferrrochromium is based on reduction smelting of chromite ore with coke in the presence of silica in a submerged arc furnace.

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  • Microwave reduction of Black Thor chromite ore

    reduction of Black Thor chromite ore from the Ring of Fire in Northern Ontario. A major objective of the research was to reduce the chromite ore in the solid state and therefore avoid the energy intensive melting process. While other pyrometallurgical methods have been used to process chromite ore

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  • Ferrochromium Alloys Manufacturing

    Ferrochromium Alloys Manufacturing. Foundry coke, anthracite, and carbon black were found to be superior to graphite as reductants. The reduction of chromite to metallics was found to proceed via the carbide intermediates (Fe,Cr)7C3 and (Fe,Cr)23C6. No evidence of

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  • v118n12a9 Influences of alkali fluxes on direct reduction

    reduction of a chromite ore with alkali fluxes at 1300176;C for 1 hour produced (Cr,Fe)7C3 type alloys with Cr/Fe mass ratios from 0.7 to 2.3. Among the alkali fluxes, reduction aided by NaOH resulted in a high degree (85%) of Cr metallization with the ferrochrome alloy being

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  • REACTION MECHANISM STUDY ON CARBOTHERMAL

    chromite particle during the reduction process can be proposed (Figure 2) (1) Reaction between chromite and carbon at the point of contact leading to formation of CO and chromium carbides. (2) Reduction of chromite by generating CO to form CO 2 with the transfer of CO from the carbon surface to proximate chromite via voids based

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  • Reduction of Kemi chromite with methane researchgate

    Kemi chromite ore from Finland was reduced in CH4 H2 gas mixtures at temperatures from 1100176; to 1350176;C. Experimental variables were time, temperature, and the CH4 content of the gas mixture.

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  • Reducing energy consumption by alternative processing

    Reducing energy consumption by alternative processing routes to produce ferrochromium alloys from chromite ore. A techno economic study on the new process identifies a reduction in overall energy consumption of 70% against conventional processing and approximately 40% lower than the

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  • Microwave reduction of Black Thor chromite ore Canadian

    Black Thor chromite ore from the Ring of Fire deposit in Northern Ontario was carbothermically reduced in a microwave system to produce a ferrochromium alloy. The as received ore contained 43.0% Cr 2 O 3 , 19.9% Fe 2 O 3 , 14.5% MgO, 13.4% Al 2 O 3, and 7.0% SiO 2 .

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  • EFFECTS OF OXIDATION ON THE MICROSTRUCTURE AND

    Oxidation at 1200 oC followed by reduction at 1200 oC results in the reduction of the M. 2O3 present in both the outer and inner grains of the pellet. There is some evidences of physical breakup or fissure formation of the chromite grains at the centre of the pellet prior to alloy formation (see Figure 19).

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  • REDUCTION OF CHROMITE ORE AT DIFFERENT FLOW

    Reduction of Chromite Ore at Different Flow Rates of Inert Gas 155 flow rate of inert gas on the segregat ion roasting of laterite ore has been in vestigated[3]. The efficiency of the segregation process depended on the flow rate of argon. Kanari and Gaballah[4] studied the kinetics of chlo

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  • Solid State Reduction of Preoxidized Chromite iron Ore

    iors of pre oxidized chromite iron ore pellets by coal. The effects of reduction parameters (temperature, time and dos age of reducing agent) on solid reduction of chromite bear ing pellets are researched and the reduction mechanism of chromite iron ore pellets was explained based on the discus sion of carbothermic reduction thermodynamics

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  • KWG Resources Inc. (KWG CSE) natural gas chromite

    KWG NATURAL GAS CHROMIUM IP DIRECT REDUCTION IN A SOLID STATE. The impact of KWG Resources new Canadian patented process on possible future direct reduction of chromite processing, has the potential for global energy reductions equivalent to the effect of completely eliminating energy demand from a country the size of Italy. KWG CEO Frank Smeenk

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  • The solid state reduction of chromite.

    The rate of iron reduction was found to be relatively rapid and to go to completion, compared to that of chromium where the formation of a relatively inert picrochromite spinel solid solution (MgO(Cr,AI)203) at the surface of the grain liinited the rate and extent of reduction to approximately 65% in the case of LG6 chromite.

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  • Microwave reduction of Black Thor chromite ore Canadian

    Second, microwave reduction experiments were performed on the chromite ore. The variables investigated were; the amount of carbon, processing time, input power, and type of atmosphere. A maximum chromium grade of 76.1% and a chromium metallisation of 82.7% were obtained for a processing time of 20 min, a power input of 800 W and a carbon

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  • REDUCTION OF CHROMITE ORE AT DIFFERENT FLOW

    Reduction of Chromite Ore at Different Flow Rates of Inert Gas 155 flow rate of inert gas on the segregat ion roasting of laterite ore has been in vestigated[3]. The efficiency of the segregation process depended on the flow rate of argon. Kanari and Gaballah[4] studied the kinetics of chlo

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  • Ferrochromium Alloys Manufacturing

    in the Reduction of Chromite. Tests were conducted to determine whether the reduction of chromite, like the reduction of chromia, proceeds via the carbide intermediates Cr3C2, Cr7C3 and Cr23C6 (reactions 1 through 4). Ten grams of pellets from minus 400 mesh graphite and minus 400 mesh concentrate were heated to 1,300176; C under 1 torr pressure.

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  • Production Smelting Technologies for Ferrochromium

    Studies on solid state reduction of chromite have shown that the iron oxides get reduced more readily than the chromite oxides 161. Under such conditions, iron forms only one carbide Fe1C, which can dissolve chromium to form a complex carbide (Cr,Fe)7C,. Thus, an ore rich in iron oxide will have high reducibility at relatively low temperatures 171.

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  • Solid State Reduction of Chromite with CO

    Reaction kinetics of solid state reduction of chromite pellets (laboratory made and industrial) and lumpy ore was investigated by the thermogravimetric analysis (TGA) technique. Carbon monoxide was used as the reducing agent, with the presence of graphite in proximity to chromite.

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  • Reduction of Kemi chromite with methane researchgate

    Kemi chromite ore from Finland was reduced in CH4 H2 gas mixtures at temperatures from 1100176; to 1350176;C. Experimental variables were time, temperature, and the CH4 content of the gas mixture.

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  • REACTION MECHANISM STUDY ON CARBOTHERMAL

    Numerous studies have been carried out on the reduction of chromite and chromium oxide3 7 either through direct interaction between solid carbon and chromite particles or through gas/solid reaction. The information dealing with the enhancement of chromite reduction

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  • The Selective Carbothermic Reduction ofChromite

    This trial demonstrated the industrial feasibility of the carbothermic selective reduction of Transvaal chromite in a DC. The Proceedings of INFACON8. arc furnace to yield a slag with 27 per cent Cr203 at a CrFe ratio of2.6 and a slag basicity of1.5.

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  • KINETIC STUDY ON SOLID STATE REDUCTION OF CHROMITE

    carbothermic reduction of the same chromite ore as Algie and Finn [3] at 1416176;C. They proposed the reduction mechanism involving the following three stages (1) reduction of iron cations (Fe3+ and Fe2+ ions) at the surface of the chromite to the metallic state during the

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  • v118n6a4 NaOH assisted direct reduction of Ring of Fire

    reduction at temperature compared to uncatalysed ores, as well as lower temperatures for the onset of reduction (Barnes, Muinonen, and Lavigne, 2015) Natural Resources Canada (NRCan) has been directed through Budget 2015 to provide significant support for the development of methods for direct reduction of chromite using various fluxes or catalysts.

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  • v118n6a3 Reduction of Kemi chromite with methane

    chromite (de Campos and Eric, 2006). In the present work, the aim was to investigate the characteristics of methane reduction for a specific chromite mined in Kemi, Finland. 47865402941.9 87+3.2 Chromite ore from Kemi has a relatively low Cr/Fe ratio, but due to the mines proximity to a

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  • Optimization of Process Parameter for Smelting and

    of Chromite ore pellets and 13 kg of the nut coke for reduction of the Chromite ore pellets and 1.4 kg of the lime stone and 2.7 kg of the quartzite to maintain the slag basicity of 1.

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  • Studies on Carbothermic Reduction of Chromite in the

    reduction of chromite; the Cr yield from chromite ore increases when increased amounts of FeOx are added. Chromite ore + mill scale + carbonaceous materials can be potentially used to directly alloy steels with Cr; chromite ore + magnetite + carbonaceous materials can be potentially used to produce Cr pre alloyed iron powder

    Live Chat
  • The Selective Carbothermic Reduction ofChromite

    This trial demonstrated the industrial feasibility of the carbothermic selective reduction of Transvaal chromite in a DC. The Proceedings of INFACON8. arc furnace to yield a slag with 27 per cent Cr203 at a CrFe ratio of2.6 and a slag basicity of1.5.

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  • Conversion of Chromium Ore Processing Residue to Chrome

    The kinetics of reduction of chromite ore plays an important role in controlling the productivity of the processes and quality of Ferro chromium. A considerable amount of research has been carried out on the carbothermic reduction of chromite ore to elucidate the kinetics and mechanism of the reduction process.

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  • Reduction/immobilization of chromite ore processing

    Chromite ore processing residue (COPR) is a hazardous waste due to the presence of highly mobile Cr(VI). In this paper, the reduction/immobilization of COPR using composite materials (fly ash, blast furnace slag and metakaolin) based geopolymer coupled with zero valent iron (ZVI) was investigated.

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