超微细贫赤铁矿直接还原-磁选试验研究  

Test Research on Direct Reduction-Magnetic Separation of Super-Fine Lean Hematite Ore

作　　者：肖永忠[1] 翟勇[1] 朱德庆[1] 潘建[1] 崔瑜[1] 徐栋梁[1] 

机构地区：[1]中南大学

出　　处：《金属矿山》2008年第4期47-49,98,共4页Metal Mine

摘　　要：湖南某赤铁矿石属铁质板岩，铁品位低，主要铁矿物赤铁矿粒度大部分仅3～5μm，且赤铁矿与石英嵌布关系复杂，采用常规选矿工艺不能有效分选。为此，采用煤基直接还原—磁选工艺处理该矿石，实现了铁的有效富集：原矿在还原温度为950℃、还原时间为80min、煤／矿质量比为2．5：1的条件下通过煤基直接还原转化为金属化率为93．82％的还原矿；还原矿经3段磨矿、3段磁选，可获得铁品位为69．54％、铁回收率为65．58％（对还原矿）、金属化率高达98．02％的铁精矿。A Hunan hematite ore belongs to ferruginous slat and is of low grade. Its main iron mineral is hematite, which mostly occurs in about 3 -5 μm size, has a complex association with quartz and can not be effectively separated by conventional processing method. Therefore, the process of coal-based direct reduction-magnetic separation was adopted for this ore. As a result, an effective iron enrichment was realized and a reduced ore obtained at a metaUization rate of 93.82% by coal-based direct reduction at a reduction temperature of 950℃, time of 80 min and coal/ore mass ratio of 2.5： 1. The reduced ore then went through three stage grinding and three stage magnetic separation. An iron concentrate was produced, with the metallization rate bring as high as 98.02% , iron grade being 69.54% and iron recovery being 65.58% （ to the run-of-mine ore）.

关 键 词：超微细贫赤铁矿 煤基直接还原 磁选 

分 类 号：TD924[矿业工程—选矿] TF55[冶金工程—钢铁冶金]