Utilization of nickel slag using selective reduction followed by magnetic separation  

选择性还原-磁选回收镍渣中的有价金属(英文)

作　　者：潘建[1] 郑国林[1] 朱德庆[1] 周仙霖[1] 

机构地区：[1]中南大学资源加工与生物工程学院,长沙410083

出　　处：《Transactions of Nonferrous Metals Society of China》2013年第11期3421-3427,共7页中国有色金属学报（英文版）

基　　金：Project([2009]606)supported by the National Development and Reform Commission of China;Project(50974135)supported by the National Natural Science Foundation of China

摘　　要：In order to utilize slag discarded by nickel plants, the selective recovery of nickel and copper versus iron was investigated by selective reduction, which was achieved by controlling the reduction parameters and magnetic separation process on bench scale. The results show that increasing the basicity （mass ratio of CaO to SIO2） of nickel slag facilitates the enrichment of nickel and copper The process parameters for selective reduction were optimized as follows： basicity of 0.15, reducing at 1200 ~C for 20 min, 5% coal on a dried slag mass base. The grinding-magnetic separation results of reduced briquettes show that concentrate containing 3.25%Ni, 1.20%Cu and 75.26%Fe is obtained and selective enrichment is achieved with a recovery of 82.20%, 80.00% for nickel and copper respectively, while the recovery of iron is only 42.17%. The S and P contents are not reduced obviously and further research may be needed to examine the behaviors of S and P in the process.采用选择性还原-磁选工艺富集某镍渣中的镍、铜,通过控制还原过程参数实现选择性还原。结果表明:添加熔剂并适当提高渣料的碱度(CaO与SiO2质量比)有助于镍、铜的富集;对碱度0.15、还原温度1200℃、还原时间20 min、内配煤量5%(质量分数)的优化条件下得到的还原样品,通过磨矿-磁选获得镍、铜、铁品位分别为3.25%、1.20%、75.26%的精矿,镍、铜、铁的回收率分别为82.20%、80.00%、42.17%,实现了镍、铜相对于铁的选择性富集;选择性还原-磁选没有显著降低S、P的含量,两者在工艺过程中的行为需要进一步研究。

关 键 词：nickel slag selective reduction magnetic separation 

分 类 号：X757[环境科学与工程—环境工程]