用氯化浸出法从铜阳极泥中回收单质砷  

Recovery of Elemental Arsenic from Copper Anode Slime by Chlorination Leaching Method

作　　者：刘远东 吕喜聪 邓成虎[1] LIU Yuandong;LYU Xicong;DENG Chenghu(Guixi Smelter,Jiangxi Copper Co.,Ltd.,Guixi 335424,China)

机构地区：[1]江西铜业集团公司贵溪冶炼厂,江西贵溪335424

出　　处：《湿法冶金》2024年第4期401-406,共6页Hydrometallurgy of China

摘　　要：研究了采用氯化浸出—NaH_(2)PO_(2)选择性还原工艺回收铜阳极泥中的单质As。考察了液固体积质量比、初始酸度、浸出温度、初始Cl^(-)质量浓度、浸出时间对As浸出率的影响,以及还原温度、NaH_(2)PO_(2)与As的物质的量比、还原时间对As还原沉淀率的影响。结果表明:最佳氯化浸出条件为初始酸度220g/L,液固体积质量比6/1,浸出温度70℃,初始Cl^(-)质量浓度150g/L,浸出时间2.5h;最佳还原条件为还原温度80℃,NaH_(2)PO_(2)与As的物质的量比2/1,还原时间2h;在最佳条件下所得单质As产品中As平均质量分数为90.44%,产品质量符合单质As的精制要求。The recovery of As from copper anode slime by chlorination leaching—NaH_(2)PO_(2) selective reduction process was studied.The effects of liquid volume to solid mass ratio,initial acidity,leaching temperature,initial Cl^(-)mass concentration and leaching time on the leaching rate of As.The effects of reduction temperature,molar ratio of NaH_(2)PO_(2) to As and reduction time on the precipitation rate of As were investigated.The results show that the optimum chlorination leaching conditions are initial acidity of 220 g/L,liquid volume to solid mass ratio of 6/1,leaching temperature of 70℃,initial Cl^(-)mass concentration of 150 g/L and leaching time of 2.5 h.The optimum reduction conditions are reduction temperature of 80℃,molar ratio of NaH_(2)PO_(2) to As of 2/1,reduction time of 2 h.Under the optimal conditions the average mass fraction of As is 90.44%,and the product quality can meet the refining requirements of elemental arsenic.

关 键 词：铜阳极泥 氯化浸出 选择性还原 单质砷 回收 

分 类 号：TF803.21[冶金工程—有色金属冶金]