红土镍矿选择性还原焙烧及扩大试验研究.doc

文档介绍：
红土镍矿选择性还原焙烧及扩大试验研究#
刘志国,孙体昌,刘真真**
(北京科技大学土木与环境工程学院矿物加工系,北京 100083)
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摘要:以含 Ni %,Fe %的红土镍矿为研究对象,进行了选择性还原小型试验研究,
最终得到镍品位为 %,镍回收率为 %的镍铁产品。试验中发现,添加 NCS 能够提
高镍的品位,CaO 能够提高镍的回收率,使用组合添加剂能够得到最佳的试验效果。研究
推测 CaO 能够和红土矿中的含镍硅酸盐反应生成低熔点的化合物,降低硅酸盐体系的粘度,
促进金属颗粒的析出、聚集长大,从而提高镍的回收率。在小型试验的基础上进行了扩大试
验研究,研究发现在扩大试验中添加剂的作用规律和小型试验基本一致,但是,试样量增加
后试验所需煤用量和小型试验有较大差距,因此进行扩大试验时要特别注意还原气氛的变化
和调整。
关键词:矿物加工;红土镍矿;选择性还原;氧化钙;组合添加剂;扩大试验
中图分类号:TD951
The selective reduction roasting and pilot test of laterite
nickel ore
LIU Zhiguo, SUN Tichang, LIU Zhenzhen
(School of Civil and Environmental Engineering, University of Science and Technology
Beijing,Beijing 100083)
Abstract: The selective reduction roasting was carried on the laterite nickel ore assaying Ni of
% and Fe of %, and the nickalloy with the nickel grade of % and nickel recovery of
% is results show that the addition of NCS can improve the grade of nickel of
mickalloy,the addition of CaO can improve the recovery of nickel, the use posite additives
can get the best results. The study shows that CaO can react with the silicate containing nickel in
laterite ore to form a low melting pounds and reduce the viscosity of the silicate system,
promoting the metal particles’ aggregation, so as to improve the recovery rate of nickel. The pilot
test was carried out on the ba