摘要
在铜电解液中加入亚砷酸铜净化脱除锑和铋,当电解液中As质量浓度从6g/L增加到12g/L后,电解液中锑和铋的质量浓度分别从0.65和0.15g/L降到0.30和0.07g/L,锑、铋去除率分别达到53.85%和53.33%。铜电解液净化后,在铜离子质量浓度为45～50g/L,硫酸质量浓度为180～210g/L,电解液温度为65℃时,电流密度为300A/m2条件下进行电解得到的阴极铜达到高纯阴极铜质量标准(GB/T467—1997)。连续电解7d所得阴极铜铜质量分数为99.9960%,阴极电流效率为99.1%。电解液中砷、锑、铋质量浓度分别为13.65,0.36和0.075g/L。电解过程中56.2%锑、88.3%铋进入阳极泥,而78.8%的砷进入电解液。电解3d后,铜离子质量浓度从45上升到51g/L,硫酸质量浓度从210下降到175g/L,槽电压从0.21上升到0.27V,采用脱铜补酸处理可维持电解的正常进行。
The Sb concentration of copper electrolyte decreases from 0.65 to 0.30 g/L, Bi from 0.15 to 0.07 g/L after As concentration increases from 6 to 12 g/L by adding copper arsenite to copper electrolyte. The removal rates of antimony and bismuth are 53.85% and 53.33%, respectively. The cathode copper electrorefined from purified copper electrolyte containing 45-50 g/L copper ion and 180-210 g/L sulfuric acid at 65℃ and 300 A/m2 gets up to the high pure grade of Chinese standard of GB/T 467-1997. The mass fraction of copper of cathode copper amounts to 99.996 0% and the cathode current efficiency is 99.1% after continuous electrolysis for 7 d. The concentration of As, Sb and Bi of electrolyte is 13.65, 0.36 and 0.075 g/L respectively after electrolysis. The 56.2% of Sb and 88.3% of Bi deposits in anode slime, while the 78.8% of As dissolves in the electrolyte. The copper ion concentration increases from 45 to 51 g/L, sulfuric acid from 210 to 175 g/Land the cell potential increases from 0.21 to 0.27 V after the continuous electrolysis for 3 d. The electrolysis can be performed continuously by removing suitable copper sulfate and adding sulfuric acid.
出处
《中南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2009年第2期311-316,共6页
Journal of Central South University:Science and Technology
基金
广东省创新基金资助项目(200501045)
关键词
铜电解液
净化
电流密度
电解
copper electrolyte
purification
current density
electrorefining
