煤基直接还原—磁选超微细贫赤铁矿新工艺  

Beneficiation of super microfine low-grade hematite ore by coal-based direct reduction-magnetic concentration process

作　　者：朱德庆[1] 翟勇[1] 潘建[1] 崔瑜[1] 唐艳云[1] 徐栋梁[1] 

机构地区：[1]中南大学资源加工与生物工程学院,湖南长沙410083

出　　处：《中南大学学报（自然科学版）》2008年第6期1132-1138,共7页Journal of Central South University:Science and Technology

基　　金：国家教育部高等学校优秀青年教师教学科研奖励基金资助项目(教人司[2000]26)

摘　　要：针对某种超微细粒贫赤铁矿难选的特点,开发了煤基直接还原—磁选新工艺,制备出高品位铁精矿。采用预热团块煤基直接还原工艺制取高金属化率的直接还原团块,经磨矿—磁选,得到高品位高金属化率的铁精矿,从而为开发利用微细粒嵌布复杂低品位铁矿提供了理论依据。通过对还原温度、还原时间及C与Fe质量比等条件的优化,得到金属化率93.72%的还原矿,经三段磨矿—三段磁选得到Fetot为69.54%,金属化率为98.01%,且有害杂质含量少的铁精矿。该工艺所得的高金属化率的铁精矿可直接作为转炉炼钢的原料。Coal-based direct reduction-magnetic concentration, a new process on up-grading of super microfine refractory hematite was developed. With adoption of the coal-based direct reduction and milling-magnetic separation, the concentrate with high grade and metallization degree was produced. This work provides a theory basis for utilization of low grade iron ore. Under the optimize conditions of reduction temperatures, duration and C/Fe mass ratio, the reduced ore with 93.72% metallization degree is produced. After three stages grinding-magnetic separation, the concentrate with 69.54% Fetot, 98.01% metallization degree and low content of impurities are obtained. The iron concentrate with high metallization degree produced by this process is a superior burden for making steel in converters.

关 键 词：贫赤铁矿 煤基直接还原 磁选 

分 类 号：TF553[冶金工程—钢铁冶金]