chromite silica carbon flux
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chromite silica carbon flux

The reduction of chromite in the presence of silica flux ...

01/03/2006  The mechanism and kinetics of the carbothermic reduction of a natural chromite was studied at 1300–1500 °C in the presence of silica. Thermogravimetry, X-ray diffraction (XRD) analysis, energy dispersive X-ray analysis (EDAX) and metallography were the experimental techniques used. Silica affected the reduction at and above 1400 °C. A two stage reduction mechanism was

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(PDF) Reduction mechanism of chromite spinel with carbon

Experimental studies were conducted on the effect of a combination of lime and silica fluxes on the carbothermic reduction of chromite. It was found that silica had a negligible effect on the ...

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Effect of silica on the carbothermic reduction of chromite

This was due to the diluent effect of SiO 2 on the contact between graphite and chromite. Increase in the carbon content of the charge resulted in higher critical silica contents. Two mechanisms ...

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Chromite - an overview ScienceDirect Topics

Chromite is a widely used aggregate valued for its relatively low thermal expansion and good chilling power, particularly for steel castings. However, the general problem with chromite is only found in steel casting operations where it is commonly employed as a facing sand for silica molds. Here the surface of the casting can become coated in so-called ‘chromite glaze’, the result of chromite being

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Chromite Silica Carbon Flux - arbeitsvertrag-stuttgart

Chromite Silica Carbon Flux. of chromite and determine if North Carolina chromite could meet any of the present industrial .. production of high-carbon ferrochrome medium carbon ferrochrome and . cause they tend to react and flux each other at operating temperatures if laid in . with silica moderate thermal expansion stability of crystalline form. Read more . Send Email: [email protected] Send ...

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Smelting of high-carbon ferrochrome from chromium ...

28/04/2017  Kaliakparov, A.G., Suslov, A.V., Nurmaganbetova, B.N. et al. Smelting of high-carbon ferrochrome from chromium agglomerate produced with alumina-silica flux. Steel Transl. 47, 65–69 (2017). https://doi/10.3103/S0967091217010077. Download citation. Received: 16 January 2017. Published: 28 April 2017. Issue Date: January 2017

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PROCESS FOR EFFECTIVE UTILIZATION OF LOW GRADE

The dried green pellets prepared with stoichiometric carbon (18.4g) and silica (3.0g) and 4.7g CaO (lime flux) are subjected to various temperatures in the range of 1000 0C to 1400 0C for different duration. The % Fe-metallization is estimated as the ratio of metallic Fe to total Fe content in the reduced pellets obtained after reduction experiment. The variation of percentage Fe metallization at

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Process for effective utilization of low grade chromite ...

Effect of carbon (coal) additionAnthracite coal is used as carbon source for reduction process of low grade chromite overburden. The carbon content in the charge was varied from 20% less than stiochiometry (14.7g) to 20% excess (22g) in order to understand the effect of carbon addition on the total metal recoveries at 1400 0 C. The theoretical requirement of carbon for reduction of Fe, Cr and ...

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(PDF) Reduction mechanism of chromite spinel with

Experimental studies were conducted on the effect of a combination of lime and silica fluxes on the carbothermic reduction of chromite. It was found that silica had a negligible effect on the ...

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Effect of silica on the carbothermic reduction of chromite

This was due to the diluent effect of SiO 2 on the contact between graphite and chromite. Increase in the carbon content of the charge resulted in higher critical silica contents. Two mechanisms ...

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Smelting of high-carbon ferrochrome from chromium ...

28/04/2017  Kaliakparov, A.G., Suslov, A.V., Nurmaganbetova, B.N. et al. Smelting of high-carbon ferrochrome from chromium agglomerate produced with alumina-silica flux. Steel Transl. 47, 65–69 (2017). https://doi/10.3103/S0967091217010077. Download citation. Received: 16 January 2017. Published: 28 April 2017. Issue Date: January 2017

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PROCESS FOR EFFECTIVE UTILIZATION OF LOW GRADE CHROMITE ...

The dried green pellets prepared with stoichiometric carbon (18.4g) and silica (3.0g) and 4.7g CaO (lime flux) are subjected to various temperatures in the range of 1000 0C to 1400 0C for different duration. The % Fe-metallization is estimated as the ratio of metallic Fe to total Fe content in the reduced pellets obtained after reduction experiment. The variation of percentage Fe metallization at

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An Improved DC-Arc Process for Chromite Smelting

were assumed to be LG6 chromite fines, duff anthracite and coal, limestone, silica, electrodes, and air. Slag, metal, gas, dust, and solids form the basis of the furnace product streams. The solid stream has been incorporated in order to provide for excess carbon fed to the unit and is assumed to leave the furnace with the slag. Slag is assumed ...

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CHROMITE. PROCESSING AND APPLICATIONS

Chromite is an oxide of iron and chromium with the chemical composition FeO.Cr 2 O 3 and belonging to the spinel group. Theoretically it contains 46.5%Cr and 25.8%Fe and their oxides. The technology of obtaining chromite is based on the principle of gravity separation and agglomeration. Among the applications we mentioned: - Ferrochrome; - Stainless steel; - Nickel chromium alloys ...

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(PDF) COAL BASED DIRECT REDUCTION OF

Effect of coal additionAnthracite coal is used as carbon source for reduction process of pre-oxidized chromite ore. The charge composition used consists of 100g preoxidized chromite ore, 15.6g quartz, 5g lime and 1.5g bentonite as binder. The amount of quartz to be used in the reduction experiments is estimated based on the theoretical requirement of silica in order to form the alumino ...

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Aspects of SAF Smelting of Ferrochrom

factor determining reaction rate. The ionic flux to the gas/solid interface is inversely proportional to the distance, so that reduction rate is enhanced with decreasing particle and grain size. Even cracks and sub-grain boundaries within the grains enhance the rates of reduction of individual chromite grains. The

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Process for effective utilization of low grade chromite ...

Effect of carbon (coal) additionAnthracite coal is used as carbon source for reduction process of low grade chromite overburden. The carbon content in the charge was varied from 20% less than stiochiometry (14.7g) to 20% excess (22g) in order to understand the effect of carbon addition on the total metal recoveries at 1400 0 C. The theoretical requirement of carbon for reduction of Fe, Cr and ...

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Chromite - Wikipedia

Chromite is a crystalline mineral composed primarily of iron oxide and chromium oxide compounds. It can be represented by the chemical formula of FeCr2O4. It is an oxide mineral belonging to the spinel group. The element magnesium can substitute for iron in variable amounts as it forms a solid solution with magnesiochromite. A substitution of the element aluminium can also occur, leading to hercynite. Chromite

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PROCESS FOR EFFECTIVE UTILIZATION OF LOW GRADE CHROMITE ...

The dried green pellets prepared with stoichiometric carbon (18.4g) and silica (3.0g) and 4.7g CaO (lime flux) are subjected to various temperatures in the range of 1000 0C to 1400 0C for different duration. The % Fe-metallization is estimated as the ratio of metallic Fe to total Fe content in the reduced pellets obtained after reduction experiment. The variation of percentage Fe metallization at

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An Improved DC-Arc Process for Chromite Smelting

were assumed to be LG6 chromite fines, duff anthracite and coal, limestone, silica, electrodes, and air. Slag, metal, gas, dust, and solids form the basis of the furnace product streams. The solid stream has been incorporated in order to provide for excess carbon fed to the unit and is assumed to leave the furnace with the slag. Slag is assumed ...

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SOME ASPECTS OF THE PRODUCTION OF ... - MINTEK MINTEK

the form of Cr-Fe-C-Si alloys, principally as high-carbon ferrochrome or charge chrome. The level of carbon and silicon in the above alloys is important especially when refining is carried out by blowing oxygen in the melt. High-carbon and charge chrome alloys are generally produced in the conventional smelting process

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CHROMITE. PROCESSING AND APPLICATIONS

Chromite is an oxide of iron and chromium with the chemical composition FeO.Cr 2 O 3 and belonging to the spinel group. Theoretically it contains 46.5%Cr and 25.8%Fe and their oxides. The technology of obtaining chromite is based on the principle of gravity separation and agglomeration. Among the applications we mentioned: - Ferrochrome; - Stainless steel; - Nickel chromium alloys ...

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Process for effective utilization of low grade chromite ...

Effect of carbon (coal) additionAnthracite coal is used as carbon source for reduction process of low grade chromite overburden. The carbon content in the charge was varied from 20% less than stiochiometry (14.7g) to 20% excess (22g) in order to understand the effect of carbon addition on the total metal recoveries at 1400 0 C. The theoretical requirement of carbon for reduction of Fe, Cr and ...

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Production Smelting Technologies for Ferrochromium

equal to moles of RO 12'. Indigenous chromite ores, mostly from Orissa's Sukinda Vally, fall into two broad categories : a) high silica hard lumps from ingneous rock, containing serpentine (MgO.Si02.nH,O) as the principal gangue with an overall Cr/Fe ratio of approx. 3. These siliceous ores are generally amenable to beneficiation by gravity methods.

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Carbothermic Reduction of Chromite Ore Under Different ...

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. However, little information is available in the literature on the influence of the gas flow rate on the rate of reduction. Experiments were carried out to study the influence of the flow rate of inert gas on the ...

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Chromite - Wikipedia

Chromite is a crystalline mineral composed primarily of iron(II) oxide and chromium(III) oxide compounds. It can be represented by the chemical formula of FeCr 2 O 4.It is an oxide mineral belonging to the spinel group.The element magnesium can substitute for iron in variable amounts as it forms a solid solution with magnesiochromite (MgCr 2 O 4). A substitution of the element aluminium can ...

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(PDF) COAL BASED DIRECT REDUCTION OF

Effect of coal additionAnthracite coal is used as carbon source for reduction process of pre-oxidized chromite ore. The charge composition used consists of 100g preoxidized chromite ore, 15.6g quartz, 5g lime and 1.5g bentonite as binder. The amount of quartz to be used in the reduction experiments is estimated based on the theoretical requirement of silica in order to form the alumino ...

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US20090071291A1 - Fire Assay Flux Composition for the ...

This invention relates to a novel fire assay flux composition including, inter alia, a dispersant in the form of a source of phosphate; a primary reductant in the form of iron powder comprising particles having a particle size of 60 mesh and finer, at least one basic flux and at least one acidic flux. The fire assay flux composition is useful for the fire assay analysis of Platinum Group Metals and gold in low and medium

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