Study On The Electro-Refining Of Tin In Acid Solution From Electronic Waste

Archives of Metallurgy and Materials

Sung Cheol Park²  Jae-Woo Ahn²  Yong Hwan Kim²  Jin Hwa Kim⁵  Man Seung Lee⁵  Seong Ho Son⁵ 

[1]ADVANCED PROCESS AND MATERIALS R&

[2]BD GROUP, KOREA INSTITUTE OF INDUSTRIAL TECHNOLOGY, INCHEON, KOREA

[3]DEPARTMENT OF ADVANCED MATERIAL SCIENCE AND ENGINEERING, MOKPO NATIONAL UNIVERSITY, MOKPO-SI, KOREA

[4]DEPARTMENT OF ADVANCED MATERIAL SCIENCE ENGINEERING, DAEJIN UNIVERSITY, POCHEON-SI, KOREA

[5]SURFACE TECHNOLOGY R&

关键词: Keywords: Electro-refining;    Tin;    Electronic waste;    Recycling;    High purity;   

DOI  :  10.1515/amm-2015-0101

学科分类：金属与冶金

来源: Akademia Gorniczo-Hutnicza im. Stanislawa Staszica / University of Mining and Metallurgy

【 摘 要 】

The tin metal could be retractable from wasted tin scrap, sludge, and wasted electroplated solution hydrometallurgical treatment, and purification process. In order to be used as resource of electronic devices, the retracted crude metal should be purified to the extent of higher than 99.9%. In this study, tin electro-refining process was performed to purify the casted tin crude metal at various experimental conditions: at the current density of 3, 5A/dm2, and in various electrolytes such as hydrochloric acid, sulfuric acid and methansulfonic acid. Additional experiment was conducted using Rotating Disk Electrode (RDE) in order to investigate the rate determining step of tin electro-refining process. The current efficiency, 65.6%, was achievable at the condition of current density, 5A/dm2, and in the electrolyte of Hydrochloric acid. During tin electro-refining process, impurity dissolved from tin crude metal into the electrolyte was analyzed using Inductively Coupled Plasma Optical Emission Spectrometer (ICP-OES), and the result showed the concentration of impurity metal gradually increased. Quantitative analysis on casted tin crude metal showed that it consists of tin with 93.9 wt.% and several impurity metals of Ag, Bi, Pb, Cu, and etc. After tin electro-refining process, the purity of tin increased up to 99.985 wt.%.

【 授权许可】

Unknown