Journal ArticleDOI
The reduction of chromite in the presence of silica flux
Peter Weber,R. Hurman Eric +1 more
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TLDR
In this article, the mechanism and kinetics of the carbothermic reduction of a natural chromite was studied at 1300-1500°C in the presence of silica, and a two stage reduction mechanism was established.About:
This article is published in Minerals Engineering.The article was published on 2006-03-01. It has received 38 citations till now. The article focuses on the topics: Chromium & Arrhenius equation.read more
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Dissertation
Unique challenges of clay binders in a pelletised chromite pre–reduction process : a case study
TL;DR: In this paper, the unique process considerations of clay binders in this process are highlighted and demonstrated using two case study clays, and it is demonstrated that the clay binder has to impart high compressive and abrasion resistance strengths to the cured pellets in both oxidising and reducing environments (corresponding to the oxidised outer layer and pre-reduced core of industrially produced pellets).
Journal ArticleDOI
Why is CaCO3 not used as an additive in the pelletised chromite pre-reduction process?
TL;DR: In this paper, the effect of CaCO3 addition on pelletised chromite pre-reduction is presented, and it was shown that CaCO 3 addition caused severe decreases in both compressive and abrasion strengths of prereduced pellets, which is unlikely to be negated by mitigation measures.
Journal ArticleDOI
A cleaner method for preparation of chromium oxide from chromite
Qing Zhao,Qing Zhao,Qing Zhao,Chengjun Liu,Dapeng Yang,Peiyang Shi,Maofa Jiang,Baokuan Li,Henrik Saxén,Ron Zevenhoven +9 more
TL;DR: In this article, a new leaching process for preparing chromium oxide from chromite was studied, using Cr(VI) extracted from the remediation treatment of chromite ore processing residue (COPR) as an oxidant.
Journal ArticleDOI
Unique challenges of clay binders in a pelletised chromite pre-reduction process.
TL;DR: In this article, the unique process considerations of clay binders in this process are highlighted and demonstrated using two case study clays and demonstrated that the clay binder has to impart high compressive and abrasion resistance strengths to the cured pellets in both oxidising and reducing environments (corresponding to the oxidised outer layer and pre-reduced core of industrially produced pellets).
Journal ArticleDOI
The Effect of Carbonaceous Reductant Selection on Chromite Pre-reduction
TL;DR: In this paper, the effects of carbonaceous reductant selection on chromite pre-reduction and cured pellet strength were investigated, and the results indicated that hydrogen (H)- (24% and volatile content (45.8%) were the most significant contributors for predicting variance in prereduction, respectively.
References
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Journal ArticleDOI
The reduction mechanism of a natural chromite at 1416 °C
O. Soykan,R.H. Eric,R. P. King +2 more
TL;DR: In this paper, the behavior of a natural chromite from the Bushveld Complex, Transvaal, South Africa, during reduction at 1416 °C by graphite was studied by means of thermogravimetric analysis, X-ray diffraction (XRD) analysis, energy-dispersive Xray analysis (EDAX), and metallographic analysis.
Journal ArticleDOI
Kinetics of the reduction of bushveld complex chromite ore at 1416 °C
O. Soykan,R.H. Eric,R. P. King +2 more
TL;DR: In this article, a generalized rate model based on an ionic diffusion mechanism was developed to satisfactorily describe the solid-state carbothermic reduction of chromite, which included the contribution of the interfacial area between partially reduced and unreduced zones in chromite particles and diffusion.
Journal ArticleDOI
The reduction mechanism of chromite in the presence of a silica flux
TL;DR: The reduction behavior of a natural chromite from the Bushveld Complex of South Africa was studied at 1300 °C to 1500 °C in this paper, where graphite was reduced by graphite in the presence of silica.
Journal ArticleDOI
Rate of reduction of Cr2O3 by carbon and carbon dissolved in liquid iron alloys
TL;DR: In this article, the rate of reduction of dense Cr2O3 on the surface of Fe-Cr-C alloys was controlled by diffusion of carbon to surface of the melt, and the chemical diffusion coefficient derived from the results (8.5 × 10-5 cm2/s) is in agreement with previous work.
Journal ArticleDOI
An examination of the decrease of surface-activity method of measuring self-diffusion coefficients in wustite and cobaltous oxide
R. E. Carter,F. D. Richardson +1 more
TL;DR: In this paper, self-diffusion coefficients have been measured for iron in wustite (700° to 1000°C) and for cobalt in cobaltous oxide (800° to 1350°C).