某微细嵌布贫赤铁矿石直接还原—弱磁选试验  

Research of Superfine Low Grade Hematite by Coal-based Direct Reduction-low Intensity Magnetic Separation

作　　者：朱德庆[1] 邓秀兰[1] 春铁军[1] 潘建[1] 肖永忠[1] 阮志勇[1] 

机构地区：[1]中南大学资源加工与生物工程学院

出　　处：《金属矿山》2012年第2期60-62,66,共4页Metal Mine

基　　金：湖南省国土资源厅矿产资源保护项目(编号:2007K02);中南大学研究生学位论文创新基金项目(编号:1343-74335000021)

摘　　要：湖南某赤铁矿石铁品位约27%,大部分铁矿物嵌布粒度在5μm左右。对该矿石进行煤基直接还原—弱磁选试验研究,主要考察了还原温度、还原时间对还原效果的影响以及磨矿细度、磁场强度对弱磁选效果的影响。试验结果表明:将原矿压团后与烟煤(煤与矿的质量比为2∶1)在1 150℃下还原焙烧100 min,所得还原矿的金属化率为93.41%;还原矿磨至-0.043 mm占90.22%后在63.68 kA/m的磁场强度下经1次弱磁选,可获得铁品位为75.71%、金属化率为92.11%、铁回收率为91.12%的铁精矿。A hematite assay 27.2% Fe and most iron minerals occurr at 5 um. Effects of various factors inducling reduction temperature, reduction time and grinding fineness on direct reduction-low intensity magnetic separation were discussed. The results show that iron ore concentrate assaying 75.71% Fe, metallization degree at 92. 11% and iron recovery at 91.12% are obtained under the following conditions： the briquettes are reduced at 1 150 ℃ for 100 min （mass ratio of soft coal to briquettes is 2） and the reduced briquettes are separated at the grinding fineness of 90. 22% less than 0. 043 mm and field strength of 63.68 kA/m.

关 键 词：微细嵌布贫赤铁矿 煤基直接还原 弱磁选 

分 类 号：TD951.1[矿业工程—选矿]