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通过试验对镍渣和煤粉制备含碳球团的直接还原和磁选进行了研究,考察了不同温度、碳氧比、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1 300℃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10min增加到90min,粒度小于0.074mm所占比例从46.9%增加到95.6%,磁选后精矿TFe质量分数从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。
The direct reduction and magnetic separation of carbonaceous pellets prepared from nickel slag and pulverized coal were studied through experiments. The changes of the metallization ratio with time, such as temperature, C / O ratio and alkalinity were investigated. Degree of magnetic separation results. The results show that the carbonization ratio is 1.2 and the alkalinity is 0.5. The reduction rate of metallization is 98.34% after directly reducing at 1300 ℃ for 20min. Grinding time increased from 10min to 90min, the proportion of particle size less than 0.074mm increased from 46.9% to 95.6%, the concentration of TFe after magnetic separation decreased from 78.82% to 74.01%, while the magnetic separation yield and iron recovery rate Respectively from 51.77% and 79.02% to 70.92% and 89.80%. Laboratory results show that nickel slag through the carbon-containing pellet direct reduction magnetic separation of iron resources which are feasible in the process.