|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||8th International Symposium on High Temperature Metallurgical Processing
||Evolution of Cr and Fe Species during Carbothermic Reduction of Chromite Ores
||Dogan Paktunc, Dawei Yu, Samira Sokhanvaran, Yves Thibault
|On-Site Speaker (Planned)
Reducibility of several different types of chromite ores from the Ring of Fire area of northern Ontario, Canada were studied at high temperatures by graphite with the addition of several catalysts/accelerants. The experiments were performed in both sealed tube furnaces and a thermogravimetric analyzer (TGA) under Ar atmosphere with continuous gas analysis. The products formed during carbothermic reduction were characterized by X-ray diffraction, optical microscopy, scanning electron microscopy, electron probe microanalysis and, at the molecular-scale, by synchrotron-based X-ray techniques. X-ray absorption near edge spectra (XANES) and extended X-ray absorption fine structure spectra (EXAFS) collected at Cr- and Fe-edges indicate various degrees of reduction and metallization with Fe reduction is always preceding that of Cr. The observations are supplemented by the thermodynamic simulations performed using FactSage. The quantitative distribution of the compounds, their nature and the phase transformations taking place during carbothermic direct reduction will be presented and discussed.
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