中文摘要：

对铁含量为50％左右的镍冶金渣进行了选铁试验研究。探索试验结果表明，重选、浮选对镍冶金渣中铁矿物无明显分选效果，磁选具有一定的分选效果。由于镍冶金渣中磁铁矿嵌布粒度细小，在磁选过程中极易流失而导致铁精矿品位及回收率下降。通过添加铁矿物絮凝剂进行絮凝-磁选优化试验研究，在油酸用量为0．8kg／t、碳酸钠用量为2．0kg／t，煤油用量为1．5kg／t，磁场强度为159kA／m的条件下，可获得铁品位为56．68％，回收率为81．72％的磁铁精矿。

英文摘要：

A set of experiments were carried for recovering magnetite from nickel metallurgical residue with 50% iron. The results of experiments showed that iron mineral could not be recovered effectively by gravity separation or flotation, while magnetic separation had a certain effect on the iron recovery. However, magnetite in the metallurgical residue was fine and was easily leaked during magnetic separation process, which leaded to the decline of iron grade and recovery of magnetite concentrate. The flocculation-magnetic separation were carried out by adding flocculant for iron mineral. The results of optimizing experiments showed that magnetite concentrate with grade of 56.68% Fe and recovery of 81.72% was obtained by flocculation-magnetic separation under the conditions of oleic acid of 0.8 kg/t, sodium carbonate of 2 kg/t, kerosene oil of 1.5 kg/t and magnetic intensity of 159 kA/m.