碱熔预脱杂-氯盐电解精炼粗锑新工艺  

A novel refining process of crude antimony by alkali melting-chloride electrolysis

作　　者：张坤坤 揭晓武 张永禄 江培海 ZHANG Kun-kun;JIE Xiao-wu;ZHANG Yong-lu;JIANG Pei-hai(BGRIMM Technology Group,Beijing 100160,China)

机构地区：[1]矿冶科技集团有限公司,北京100160

出　　处：《矿冶》2022年第5期56-63,共8页Mining And Metallurgy

基　　金：国家重点研发计划项目(2019YFC1908301);矿冶科技集团有限公司青年科技创新基金资助项目(04-2127)。

摘　　要：针对传统粗锑精炼工艺存在能耗高、锑金分离效果差和环境污染严重等问题,根据粗锑组元标准电极电位差异,提出“碱熔预脱杂—氯盐电解”精炼新工艺。结果表明:粗锑添加2%碳酸钠、3%粉煤,在850℃下熔化除杂30 min,浇铸得到的锑阳极板As含量可降低至0.07%,之后以NaCl~150 g/L、盐酸~40 g/L、Sb^(3+)~40 g/L混合液为电解液,在电流密度200 A/m^(2)和电解温度45℃优化工艺条件下电解,得到的阴极锑满足标准GB/T 1599—2014(Sb 99.70)质量要求,富金阳极泥Au含量达7076 g/t。既可实现粗锑的综合回收,又显著增加产品附加值。In view of the present process existing shortcomings of high energy consumption,poor separation effect of antimony with gold and unfriendly environment,a novel refining technology for crude antimony of“alkali melting-chloride electrolysis”was proposed according to the differences among standard electrode potential.The results show that the As content in casted antimony anode plate was decreased to 0.07%when crude antimony was smelted for 30 min at 850℃with the ratio of 2%Na_(2)CO_(3)and 3%coal powder.Then under the optimum conditions of current density of 200 A/m^(2)and temperature of 45℃,the cathode antimony meeting the quality requirements of GB/T 1599—2014(Sb 99.70)and the Au rich anode slime(7076 g/t)could be obtained in the electrolyte of NaCl(<150 g/L),HCl(<40 g/L)Sb^(3+)(<40 g/L)solution.The comprehensive recovery of crude antimony has been realized,and the added value of products has been increased significantly.

关 键 词：粗锑 氯盐体系 电解精炼 锑金分离 

分 类 号：TF818[冶金工程—有色金属冶金] TF831