从电子脚镀锡铜针中回收锡和铜

介绍了从电子脚镀锡铜针中回收锡和铜的工艺研究及生产实践。采用常温碱性电解脱锡,电解液无须加热循环流动,控制电流密度200A/m2、槽电压0.2⁰.4V,电解液含Sn 80.4V,电解液含Sn 8¹5g/L、NaOH 6015g/L、NaOH 60¹20g/L时,铜、锡的直收率分别达到99.7%和94.5%。脱锡铜针抛光处理后可以直接电解生产符合GB/T467-2010标准中Cu-CATH-1要求的阴极铜,电解条件:装填光亮铜针高出电解液面5cm以上,电流密度200A/m2,槽电压0.7V,电解液含Cu 45120g/L时,铜、锡的直收率分别达到99.7%和94.5%。脱锡铜针抛光处理后可以直接电解生产符合GB/T467-2010标准中Cu-CATH-1要求的阴极铜,电解条件:装填光亮铜针高出电解液面5cm以上,电流密度200A/m2,槽电压0.7V,电解液含Cu 45⁵0g/L、H2SO415050g/L、H2SO4150¹80g/L。

Recovery of Tin and Copper from Electronic Foot Tin Plated Copper Needle

The technical study and plant practice of recovery of tin and copper from electronic foot tin plated copper needle were introduced. Tin was separated by alkaline electrolysis at room temperature without heating and electrolyte circulating. The recovery rate of copper and tin is 99.7% and 94.5% respectively under the conditions including current density of 200 A/m2, cell voltage of 0.2~0.4 V, electrolyte composition of Sn of 8~15 g/L and NaOH of 60~120 g/L. Cathode copper according with the requirements of Cu-CATH-1 brand under GB/T467-2010 standards is directly electrolyzed from polished de-tinning copper needle under the electrolysis conditions including copper needle being 5 cm higher than electrolytic liquid level, current density of 200 A/m2, cell voltage of 0.7 V, electrolyte composition of Cu of 45~50 g/L and H2SO4 of 150~180 g/L.