转炉钢渣磁选过程含铁矿物的分离特征

Separation Feature of Iron-containing Minerals during Wet Magnetic Separation Process

采用磁选提铁的方法探讨了钢渣中含铁物相的分离特征，对比了分离出的精矿、尾矿微观结构和成分的变化规律，结果表明：转炉钢渣中铁的赋存状态主要是纯的铁氧化物和RO相为主。9．6×10^4A／m磁场强度下，磁选产物主要为金属铁颗粒和铁的氧化物，9．6×10^4A／m强磁场条件下，RO相被大量分离提取。磁选处理后，转炉渣全铁质量分数由34．73％降低至22．84％，磷质量分数由1．23％降到0．77％，游离氧化钙质量分数由3．45％降低至0．78％，既实现了在一定程度上回收金属铁的目标，尾矿的综合利用价值也大大提升。

In this present work, the separation feature of iron-containing minerals was discussed by using the wet magnetic separation method, the variation of micro-structure and compositions for the concentrates and tailings from the magnetic separation process was compared. The results showed that, in the BOF steel slag, the occurrence of iron mainly includes oxide of iron and RO phase. Under magnetic field of 1200Oe, magnetic concentrates are metallic iron and oxides of iron, also at the magnetic field of 12000Oe, RO phase is almost separated form steel slag. After the magnetic separation process, the total iron in steel slag decreases form 34.73% to 22.84%, the phosphorus content decreased from 1.23% to 0.77%, and free CaO content decreased from 3.45% to 0.78 respectively. This process realized the aim of iron recovery from BOF slag as well as improved the re-use value of tailings.