从低品位红土镍矿中高效回收镍铁  

High recovery of ferro-nickel from low grade nickel laterite ore

作　　者：梁威[1] 王晖[1] 符剑刚[1] 何章兴[1] 

机构地区：[1]中南大学化学化工学院有色金属资源化学教育部重点实验室,湖南长沙410083

出　　处：《中南大学学报（自然科学版）》2011年第8期2173-2177,共5页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(50704036)

摘　　要：以低品位红土镍矿(w(Ni)=1.52%,w(Fe)=14.08%)为原料,采用"一步还原焙烧-磁选"工艺制取镍铁合金。考察反应温度、反应时间、还原煤量和复合添加剂对红土镍矿焙烧效果的影响。研究结果表明:在还原煤为20%、复合添加剂为12%、焙烧温度为1 200℃、通N2保护条件下焙烧180 min,原矿中的大部分氧化镍和少量氧化铁得到选择性还原;焙砂水淬急冷后常规磁选,得到Ni质量分数为10.74%,Fe与Ni的质量分数之比为4.5,Ni回收率为86.23%的镍铁精矿,达到从红土镍矿中高效回收镍铁的目的。The process of one-step reduction roasting and magnetic separation was adopted to prepare ferro-nickel alloy from low-grade nickel laterite ore（w（Ni）=1.52%,w（Fe）=14.08%）.The roasting factors including roasting temperature,time,reducing coal amount and compound additive were investigated.The results indicate that under the conditions of adding 20% reducing coal,12% compound additive,roasting temperature and roasting in a N2 protected atmosphere 180 min at 1 200 ℃,most of nickel and a spot of iron are selectively reduced.Then conventional magnetic separation is carried out after water quenching of the roasted ore.The content of Ni and the ratio of Fe/Ni are 10.74% and 4.5 in ferro-nickel concentrate prepared by this method,respectively.And the recovery rate of Ni is 86.23%,which indicates that a high recovery of ferro-nickel from nickel laterite ore is achieved indeed.

关 键 词：红土镍矿 选择性还原焙烧 复合添加剂 磁选 镍铁 

分 类 号：TF815[冶金工程—有色金属冶金] TF803.12