摘要
针对镁质红土镍矿还原产物镍回收率低、镍磁黄铁矿中镍资源难以回收的问题,本文将含镍磁黄铁矿氧化焙烧产物作为镁质红土镍矿直接还原工艺的添加剂,以促进镁质红土镍矿在直接还原过程中镍铁颗粒的迁移长大,进而改善后续镍铁颗粒与焙烧渣的磁选分离效果。试验结果表明,将镁质红土镍矿(含镍1.24%)与磁黄铁矿(含镍1.16%)的氧化焙烧产物按1∶6的质量比混合,添加混合物料总质量6%的还原煤以及6%的氟化钙,在1200℃下焙烧50 min,通过磨矿-磁选,可以获得镍品位为4.26%的镍铁产品,镍回收率为91.85%。该方法实现了镁质红土镍矿和含镍磁黄铁矿的综合回收利用,为难处理资源的充分利用提供了新的思路。
Considering low Ni recovery from the reduction product of high-Mg nickel laterite and difficult recovery of Ni from pyrrhotite,the oxidation roasting product of pyrrhotite was used as an additive to promote the migration and growth of ferronickel particles in the direct reduction of high-Mg nickel laterite and to improve the follow-up magnetic separation effect of ferronickel particles from roasting slag.The test results show that under the conditions that magnesian laterite containing 1.24% nickel and the oxidation roasting product of pyrrhotite containing 1.16% nickel are mixed at a mass ratio of 1∶6,with 6% reduced coal and 6% calcium fluoride added,for roasting at 1 200 ℃ for 50 min,followed by grinding and magnetic separation,the ferronickel product with Ni grade of 4.26% and Ni recovery of 91.85% can be obtained.By using this method,the comprehensive recovery and utilization of magnesian laterite and nickel-bearing pyrrhotite can realized and new ideas have been provided for fully utilization of refractory resources.
作者
刘志国
何志红
康金星
于传兵
邓朝安
LIU Zhi-guo;HE Zhi-hong;KANG Jin-xing;YU Chuan-bing;DENG Chao-an(China ENFI Engineering Corporation,Beijing 100038,China;Yiliang Chihong Mining Co.,Ltd.,Zhaotong 657000,China)
出处
《中国有色冶金》
CAS
北大核心
2022年第6期125-132,共8页
China Nonferrous Metallurgy
关键词
高镁型红土镍矿
含镍磁黄铁矿
难处理资源
镍铁回收
共还原
冶选联合工艺
high-Mg nickel laterite
nickel-bearing pyrrhotite
refractory resources
ferronickel recovery
co-reduction
beneficiation-metallurgy combined process
作者简介
刘志国(1989-),男,汉族,博士,高级工程师,主要从事复杂矿石资源综合利用技术研究。
