金川镍渣直接还原磁选提铁实验研究

Direct Reduction and Magnetic Separating Experiment Study of Nickel Slag

通过实验对镍渣和煤粉制备的含碳球团直接还原及磁选进行了研究,考察了不同温度、C/O、碱度等参数随时间的金属化率变化情况,以及不同磨矿细度下的磁选结果。结果表明:碳氧比为1.2,碱度为0.5的镍渣含碳球团,在1300℃下直接还原20min后可以获得98.34%的金属化率,在该条件下还原后所得金属化球团磨矿时间从10 min增加到90min,-200目所占比例从46.9%增加到95.6%,磁选后精矿TFe含量从78.82%降低到74.01%,而磁选产率与铁回收率则分别从51.77%和79.02%增加到70.92%和89.80%。实验室结果表明,镍渣通过含碳球团直接还原磁选的方式利用其中的铁资源在工艺上是可行的。

Direct reduction experiment and magnetic separating were carried out by using carbon-bearing pellets which were compacted by nickel slag and coal. The effects of different reduced temperatures, different C/O in pellets and basicity to the reduction results were investigated. The results show that the metallization degree can reach 98.72% when the direct reduction conditions are C/O in pellet 1.2, basicity 0.5, reduced temperature 1300~C and time 20min. In 90 minutes grinding metalized pellets getting under above conditions, the proportion of -200 powder reached from 46.9% to 95.6%, the TFe content of concentrate reduced from 78.82% to 74.01%, magnetic separating rate and recovery rate of iron increased from 51.77% and 79.02% to 70.92% and 89.80% respectively. The laboratory results show that it is feasible in process recycling iron resources in nickel slag by direct reduction and magnetic separating of carbon-bearing pellet.