重庆大学学报Issue(2)：25-32,8.
铬铁矿的还原焙烧与磁选分离
Reduction roasting and magnetic separation of chromite ore
摘要
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 (Cr2 O3 )/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.关键词
铬铁矿/焙烧/尖晶石结构/磁选/铬铁比Key words
chromite ore/roasting/spinel structure/magnetic separation/w (Cr2 O3 )/w (FeO)分类
矿业与冶金引用本文复制引用
亓捷,刘承军,张波,姜茂发..铬铁矿的还原焙烧与磁选分离[J].重庆大学学报,2015,(2):25-32,8.基金项目
国家重点基础研究发展计划项目（2012CB626812）；教育部新世纪人才计划项目（NCET-11-0077）；辽宁省自然科学基金项目（201102062）；辽宁省科技攻关项目（2012221013）。Supported by National 犓ey 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 犓ey Science and Technology Program of Liaoning Province of China （2012221013）． （）
