镍红土矿加压浸出渣磁化焙烧-弱磁选铁精矿的研究

Magnetic roasting of pressure leaching residue of nickel laterite and weak magnetic separation of iron concentrate

以镍红土矿加压酸浸渣为原料(其主要成分是以赤铁矿为主的铁矿物),对其进行磁化焙烧-弱磁选铁精矿的实验研究,确定还原焙烧-弱磁选工艺的优化条件。研究结果表明该工艺的优化条件是:无烟煤质量分数为20%,焙烧温度为750℃,焙烧时间为60 min,冷却方式为水冷,弱磁选磁场强度为195 kA/m,在此最优条件下,铁品位和回收率分别为64%和94%,精矿中S质量分数为0.16%,达到了钢铁对铁精矿成分的要求。

An acid leaching residue of nickel laterite with high content of iron minerals which is mainly hematite was chosen as the raw material.The technique of reducing roasting-weak magnetic separation was adopted,and the optimum conditions were determined.The results show that the optimum conditions are as follows： anthracite mass fraction is 20%,roasting temperature is 750 ℃,roasting time is 60 min,cooling to water,and the weak magnetic field strength is 195 kA/m.Under the optimum conditions,the iron concentrate grade and recovery of iron are 64% and 94%,respectively.Moreover,the content of sulfur in iron concentrate is 0.16%,which meets the requirement for iron making.