Reduction roasting and magnetic separation of chromite ore
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Abstract:
Reduction roasting and magnetic separation of chromite ore is investigated，using South African chromite ore as raw materials and Lu’an pulverized coal as reductant.The phase changes in the reduction and magnetic separation process is analyzed systematically by means of SEM-EDS and X ray diffraction.The results show that only iron oxides in the chromite ore are reduced when the temperature is below 1 200 ℃，and chromium oxides are reduced into chromium carbide when the temperature exceeds 1 300 ℃.The spinel structure is transformed and destroyed gradually with the proceeding of reduction reaction.Under the considering experimental conditions，the appropriate temperature for pretreatment is 1 200 ℃，with an iron removal rate of 46%，a chromium yield rate of 80%，and a higher w(Cr2O3)/w(FeO) value of 3.75，the magnetic separation product is mainly iron.This work has great theoretical significance for the development of chromite ore pretreatment process and the comprehensive utilization of low-grade chromite ore.
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Supported by National Key Basic Research Project of China (2012CB626812), Program for New Century Excellent Talents in University of Ministry of Education of China (NCET-11-0077), Natural Science Foundation of Liaoning Province of China (201102062), and Key Science and Technology Program of Liaoning Province of China (2012221013).
