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为提高红土镍矿金属品位及回收率,采用含碳球团还原焙烧-磁选分离工艺对镍品位为1.45%(质量分数,余同)的红土镍矿进行了处理,研究了还原温度、配碳量、还原时间以及磁选工艺对Ni、Fe品位和回收率的影响。试验结果表明:随着还原温度和配碳量的增加,Ni、Fe品位及回收率均会增加,其中温度的影响最大,配碳量次之,时间最小。1 000℃以下,还原产物多表现为弱磁性;1 200℃时,Ni、Fe主要以强磁性物质存在;当还原温度为1 200℃,碳、氧摩尔比为1.2,还原时间为30min,磁场强度在(1 000～1 143)×10-4 T时,Ni、Fe品位及回收率最佳。
In order to improve the metal grade and recovery of lateritic nickel ore, nickel-bearing laterite nickel ore with a nickel grade of 1.45% (mass fraction) was treated with carbon-containing pellet reduction roasting-magnetic separation separation process. The reduction temperature, Carbon content, reduction time and magnetic separation process on Ni, Fe grade and recovery. The results show that with the increase of reduction temperature and carbon content, the Ni and Fe grades and the recovery rate will increase, of which the temperature has the greatest impact, the carbon content takes the second place, and the time is the smallest. Below 1 000 ℃, the reduction products mostly showed weak magnetic properties. At 1200 ℃, Ni and Fe mainly existed as ferromagnetic substances. When the reduction temperature was 1 200 ℃, the molar ratio of carbon to oxygen was 1.2 and the reduction time was 30 minutes, The strength and recovery of Ni and Fe were the best at (1 000 ~ 1 143) × 10-4 T.