红土镍矿深度还原-磁选富集镍铁实验研究  

Deep Reduction/Magnetic Separation of Laterite for Concentration of Ni and Fe

作　　者：李艳军[1] 李淑菲[1] 韩跃新[1] 

机构地区：[1]东北大学资源与土木工程学院,辽宁沈阳110819

出　　处：《东北大学学报（自然科学版）》2011年第5期740-744,共5页Journal of Northeastern University(Natural Science)

基　　金：国家高技术研究发展计划项目(2009AA06Z111);中国博士后科学基金资助项目(20090461192)

摘　　要：采用深度还原-磁选工艺,以煤粉为还原剂,添加氧化钙作助溶剂,在微熔化,不完全造渣的条件下,将矿石中镍和铁的氧化物还原成金属镍铁,然后经磁选方法使金属镍铁在磁性产品中得到富集.结果表明,深度还原最佳工艺条件为:还原温度1 300℃,还原时间60 min,配煤过剩倍数2.在此工艺条件下得到镍、铁质量分数分别为5.01%,22.46%的镍铁产品,镍、铁回收率分别为96.05%,79.69%.对深度还原过程研究表明,还原物料中镍和铁以金属合金颗粒形式存在,高温有利于镍铁金属相凝聚,适当延长还原反应时间有利于镍铁颗粒的还原和聚集长大,进而有利于磁选富集.Nickeliferous laterite ore was first treated by a deep reduction process with coal as reductant and calcium oxide as flux under fractional smelting conditions,then followed by magnetic separation for recovery of nickel and iron.Optimal reduction conditions were 1 300 ℃ for 120 min at coal blending ratio 2∶1.The main performance indices of the process were 5.01% nickel grade,22.46% iron grade,and metal recovery of nickel and iron at 96.05 and 79.69%,respectively.Various characteristics of the reduction materials were investigated.It＇s indicated that metallic nickel and iron were eutectic.An increase in reduction temperature accelerated aggregation of the nickel and iron metal phase and increasing reduction time contributed to growth of metallic particles,thus making magnetic separation much easier.

关 键 词：红土镍矿 深度还原 磁选 镍铁合金 

分 类 号：TD925.7[矿业工程—选矿]