Electrolytic Recovery of Tin from Waste Lead Frames: Use of Aqueous HCl Leaching Solution as Electrolyte

Kyung-Hoon Kang; Beomseok Kim; Min Hye Seo; Sung-Su Cho; Sungkyu Lee; Hyun Seon Hong

doi:10.3139/120.110415

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Electrolytic Recovery of Tin from Waste Lead Frames: Use of Aqueous HCl Leaching Solution as Electrolyte

Kyung-Hoon Kang , Beomseok Kim , Min Hye Seo , Sung-Su Cho , Sungkyu Lee and Hyun Seon Hong

Published/Copyright: May 26, 2013

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From the journal Materials Testing Volume 55 Issue 2

Abstract

Lead frames are generated in large quantities by modern semiconductor packaging industry and they contain significant concentrations of valuable tin, nickel, and copper. For electrowinning of tin from waste lead frames, hydrochloric acid leaching of tin is quite advantageous, but solution stability, electrolytic efficiency and deposit morphology should be optimized before commercialization. HCl electrolyte was diluted (distilled water: HCl = 350:150) for electrowinning of waste lead frames at 40 °C with 0.2 A/cm² and Ti-Ir cathode. After 4 h electrowinning, 99% pure Sn with 99.1% recovery rate was produced. Therefore, aqueous HCl electrolyte was quite effective for electrowinning of Sn leaching solution, and a higher recovery rate of purer Sn within shorter electrowinning time was obtained.

Kurzfassung

Leiterplatinen werden in großen Stückzahlen in der modernen Halbleiterindustrie erzeugt und sie enthalten signifikante Konzentrationen an verwertbarem Zinn, Nickel und Kupfer. Zur Gewinnungselektrolyse von Zinn aus Abfallleiterplatinen ist das Auslaugen von Zinn mittels Salzsäure sehr vorteilhaft, jedoch sollten die Stabilität der Lösung, die elektrolytische Leistung und die Ablagerungsmorphologie vor einer Kommerzialisierung des Prozesses optimiert werden. In der diesem Beitrag zugrunde liegenden Studie wurde HCl als Elektrolyt für die Gewinnungselektrolyse aus Abfallleiterplatinen bei 40 °C mit 0,2 A/cm² und einer Ti-Ir Kathode verdünnt (destilliertes Wasser: HCl = 350:150). In vier Stunden Gewinnungselektrolyse konnte 99% reines Zinn bei einer Gewinnungsrate von 99,1% produziert werden. Wässrige Salzsäure als Elektrolyt war durch Auslaugen von Zinn recht effektiv für die Gewinnungselektrolyse und es ergab sich eine höhere Gewinnungsrate von reinerem Zinn bei geringeren Zeiten.

Kyoung-Hoon Kang, born 1972, received his BS at the Yeungnam University, Gyeongsan-si, Korea in 1999. He graduated as MS in Chemical Engineering at the Hanyang University of Ansan-si, Korea in 2002. He is now in PhD program at the Division of Chemical and Materials Engineering, Ajou University, Suwon-si, Korea.

Beomseok Kim, born 1982, received his BS at the Ajou University, Suwon-si, Korea in 2009. He is now in PhD program at the Department of Chemistry, Yonsei University, Seoul, Korea.

Min Hye Seo, born 1980, received her BS at the Seoul Women's University, Korea in 2003. She graduated as MS in Environmental Engineering at the Ajou University, Suwon, Korea in 2005. She is working as senior engineer at the Advanced Materials and Processing Center, Institute for Advanced Engineering, Yongin-si, Korea.

Sung-Su Cho, born 1973, received his BS at Kyonggi University, Suwon, Korea in 2005. He graduated as MS in Energy Systems Research at the Ajou University, Suwon, Korea in 2007. Now he is working as principal engineer at the Advanced Materials and Processing Center, Institute for Advanced Engineering, Yongin-si, Gyeonggi-do, Korea.

Sungkyu Lee, born 1959, received his BS at the Hanyang University of Seoul, Korea in 1982. He graduated as MS and PhD in Materials Science and Engineering at the University of Minnesota at Twin Cities, USA in 1991 and 1994, respectively. Now he is working as Principal engineer at the Advanced Materials and Processing Center, Institute for Advanced Engineering, Yongin-si, Gyeonggi-do, Korea.

Hyun Seon Hong, born 1968, received his BS, MS, and PhD in Materials Engineering at the Hanyang University of Seoul, Korea in 1991, 1994, and 1998, respectively. Now he is working as center leader of the Advanced Materials and Processing Center, Institute for Advanced Engineering, Yongin-si, Gyeonggi-do, Korea.

References

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Published Online: 2013-05-26

Published in Print: 2013-02-01

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https://doi.org/10.3139/120.110415