Efficient enrichment of nickel and iron in laterite nickel ore by deep reduction and magnetic separation  

红土镍矿深度还原-磁选工艺富集镍和铁（英文）

作　　者：Shuai YUAN Wen-tao ZHOU Yan-jun LI Yue-xin HAN 袁帅;周文涛;李艳军;韩跃新(东北大学资源与土木工程学院)

机构地区：[1]College of Resources and Civil Engineering,Northeastern University,Shenyang 110819,China

出　　处：《Transactions of Nonferrous Metals Society of China》2020年第3期812-822,共11页中国有色金属学报（英文版）

基　　金：Projects(51904058,51734005)supported by the National Natural Science Foundation of China;Project(2018YFC1901901902)supported by the National Key Research and Development Program of China

摘　　要：The process of deep reduction and magnetic separation was proposed to enrich nickel and iron from laterite nickel ores.Results show that nickel-iron concentrates with nickel grade of 6.96%,nickel recovery of 94.06%,iron grade of 34.74%,and iron recovery of 80.44% could be obtained after magnetic separation under the conditions of reduction temperature of 1275℃,reduction time of 50 min,slag basicity of 1.0,carbon-containing coefficient of 2.5,and magnetic field strength of 72 kA/m.Reduction temperature and time affected the possibility of deep reduction and reaction progress.Slag basicity affected the composition of slag in burden and the spilling and enriching rate of nickel-iron from a matrix to form nickel-iron particles.Nickel-iron particles were generated,aggregated,and grew gradually in the reduction process.Nickel-iron particles can be effectively separated from gangue minerals by magnetic separation.提出采用"深度还原-磁选"工艺从红土镍矿中富集镍和铁。结果表明,在还原温度1275℃、还原时间50 min、渣相碱度1.0、配碳系数2.5和磁场强度72 kA/m的条件下,可得到镍品位为6.96%、回收率为94.06%和铁品位为34.74%、回收率为80.44%的镍铁精矿产品。分析表明,还原温度和时间影响深度还原发生的可能性及反应进度,渣相碱度影响炉料中渣的组成及镍铁元素从基体中溢出富集形成镍铁颗粒的速度,深度还原反应过程中镍铁颗粒生成、聚集并逐渐长大,经磁选后可有效促进镍铁矿物与脉石矿物分离。

关 键 词：laterite nickel ore deep reduction magnetic separation nickel-iron concentrate reduction mechanism 

分 类 号：TD924[矿业工程—选矿] TD951