Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报(英文版)

Transactions of Nonferrous Metals Society of China

Vol. 31    No. 6    June 2021

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Direct carbothermic reduction of ilmenite concentrates by adding high dosage of Na2CO3 in microwave field
Zhi-gang YU1,2,3, Jing-wu XIAO1,2,3, Hai-yan LENG1,2,3, Kuo-chih CHOU1,2,3

1. School of Materials Science and Engineering, Shanghai University, Shanghai 200072, China;
2. State Key Laboratory of Advanced Special Steels, Shanghai University, Shanghai 200072, China;
3. Shanghai Key Laboratory of Advanced Ferro-metallurgy, Shanghai University, Shanghai 200072, China

Abstract:A clean and efficient route for the utilization of ilmenite concentrates was proposed by direct carbothermic reduction in microwave field. High dosage of Na2CO3, which can be recycled, was added to accelerate the reduction reaction of ilmenite concentrates. After microwave heating in the temperature range of 1073-1123 K for 20 min, the main products were Na2TiO3 and metallic Fe with the metallization ratios being as high as 92.67%-93.21%. The reduction products were processed by water leaching, ball-milling in CO2 atmosphere and magnetic separation in turn. The final products after magnetic separation were Fe-rich materials and Ti-rich materials (90.04 wt.% TiO2), which can be used to produce iron and TiCl4 or TiO2. The optimized heating temperature was 1123 K in terms of metallization ratios, magnetic separation and caking property of the reduction products. Besides, the reduction mechanism of ilmenite concentrates with the addition of Na2CO3 in microwave field was also proposed.

 

Key words: ilmenite concentrates; microwave; Na2CO3; carbothermic reduction

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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