Carbothermic reduction of synthetic chromite with/without the addition of iron powder

Hu, XianfengRISE,MEFOS,Luleå University of Technology, Sweden,Process Metallurgy Department, Swerea MEFOS (författare)

QC 20170210
Validerad; 2017; Nivå 2; 2017-01-13 (andbra)
Carbothermic reduction of chromite is an important industrial process for extracting chromium from the chromite. To have a better understanding of the effect of iron on the carbothermic reduction of chromite, the reduction of synthetic chromite (FeCr2O4) by graphite with/without the addition of iron powder was investigated in this paper by Thermogravimetric Analysis (TGA) in argon atmosphere. The fractional reduced samples were examined by SEM/EDS and XRD analysis, and the reduction process was thermodynamically and kinetically evaluated. The experimental results show that the iron powder addition enhances the reduction of FeCr2O4 and this effect increases when increased amounts of iron powder are added. This phenomenon is attributed to the in situ dissolution of chromium into the iron and mixed carbide (Cr,Fe)7C3, which can decrease the activity of the nascent chromium formed by the reduction of the FeCr2O4. The experimental results indicate that the reduction of FeCr2O4 with up to 80 wt.% iron powder addition is likely to be a single-step process and the kinetic analysis suggests that the reduction reaction is likely to be either (a) chemical reaction at the surface of FeCr2O4 or (b) diffusional dissolution of the product (FeCr2) into the iron/alloy particles or the mixed control of (a) and (b).

TEKNIK OCH TEKNOLOGIER Materialteknik Metallurgi och metalliska material hsv//swe
ENGINEERING AND TECHNOLOGY Materials Engineering Metallurgy and Metallic Materials hsv//eng
Carbothermic reduction
Chromite
Kinetics
Thermogravimetric analysis
Carbides
Carbothermal reduction
Chemical analysis
Chromite deposits
Chromium
Dissolution
Enzyme kinetics
Iron
Iron powder
Reduction
Surface reactions
Argon atmospheres
Diffusional dissolution
Industrial processs
Kinetic analysis
Powder additions
Reduction process
Reduction reaction
Single-step process
Process Metallurgy

Teng, LidongKTH,Materialens processvetenskap,KTH Royal Institute of Technology, Sweden,Division of Materials Process Science, KTH-Royal Institute of Technology(Swepub:kth)u1cd4hn6 (författare)
Wang, HijuanUniversity of Science and Technology, China,State Key Laboratory of Advanced Metallurgy, University of Science and Technology (författare)
Sundqvist-Öqvist, LenaLuleå tekniska universitet,RISE,MEFOS,Luleå University of Technology, Sweden,Mineralteknik och metallurgi(Swepub:ltu)lensun (författare)
Yang, QixingLuleå tekniska universitet,Mineralteknik och metallurgi(Swepub:ltu)yang (författare)
Björkman, BoLuleå tekniska universitet,Mineralteknik och metallurgi(Swepub:ltu)bobj (författare)
Seetharaman, SeshadriKTH,Materialens processvetenskap,KTH Royal Institute of Technology, Sweden,Division of Materials Process Science, KTH-Royal Institute of Technology(Swepub:kth)u1dt6m1e (författare)
RISEMEFOS (creator_code:org_t)

Ingår i:ISIJ International: Iron and Steel Institute of Japan56:12, s. 2147-21550915-15591347-5460

Av författaren/redakt...: Hu, Xianfeng; Teng, Lidong; Wang, Hijuan; Sundqvist-Öqvist ...; Yang, Qixing; Björkman, Bo; visa fler...; Seetharaman, Ses ...; visa färre...

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