配矿强化中低品位红土镍矿选择性还原研究  

Improving selective reduction roasting-magnetic separation to concentrate nickel of low and middle grade nickel laterite ore by ore blending

作　　者：潘建[1] 田宏宇[1] 朱德庆[1] 韦韬 黄庆周 潘料庭 

机构地区：[1]中南大学资源加工与生物工程学院,湖南长沙410083 [2]北海诚德镍业有限公司,广西北海536017

出　　处：《烧结球团》2018年第1期15-19,24,共6页Sintering and Pelletizing

基　　金：自然科学基金(50974135;51574281)

摘　　要：以两种中低品位红土镍矿A(Ni0.97%和Fe40.09%)和B(Ni1.42%和Fe23.16%)为原料,探究红土镍矿中镍的赋存状态和分布规律,并通过配矿来强化直接还原焙烧-磁选的试验研究。结果表明,褐铁矿型红土镍矿中,镍多数赋存在主要矿物针铁矿晶格中,利蛇纹石中镍品位也较高;腐殖土型红土镍矿中,铁镁硅酸盐矿物含量为65%左右,镍品位较低;针铁矿含量约为30%,含镍品位较高。通过配矿可以减少铁镍比,配合添加剂可以抑制铁的还原,降低还原温度到1100℃左右,此时得到镍品位6%左右的镍铁精矿,镍回收率为92.08%。还原焙烧矿中镍被有效富集于γFe-Ni合金晶粒中,其它物相中含镍极少,实现了镍的选择性还原和富集。The direct reduction roasting-magnetic separation experiment was conducted on nickel laterite sample A, which graded 0. 97 % Ni and 40.09 % Fe, and B which graded 1.42 % Ni and 23.16 % Fe, to research existing state and regularities of distribution of nickel laterite ore, and to explore intensify method of direct reduction by ore blending. The resuhs show that Ni reserves mainly in goethite lattice in limonite nickel laterite ore, and the grade of Ni is also high in lizardite. In humous nickd laterite ore, iron-magnesium silicate is main mineral, which has low grade of Ni, and goethite is secondary mineral, which has high grade of Ni. It can reduce reduction temperature and Fe/Ni by ore blending, and control reduction of iron cooperating additional agent. And concentrate assaying 6 % nickel was thus manufactured at a recovery of 92.08 %. Ni mainly enriched in γFe-Ni and little distributed in other phase in reduced roasting ore, which realizes selective reduction and beneficiation.

关 键 词：中低品位红土镍矿 硫添加剂 配矿 选择性还原 

分 类 号：TF046[冶金工程—冶金物理化学] TD98[矿业工程—选矿]