Sustainable System for Raw-Metal Recovery from Crystalline Silicon Solar Panels: From Noble-Metal Extraction to Lead Removal

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• 作者：Byungjo Jung ; Jongsung Park ; Donghwan Seo ; Nochang Park
• 刊名：ACS Sustainable Chemistry & Engineering
• 出版年：2016
• 出版时间：August 1, 2016
• 年：2016
• 卷：4
• 期：8
• 页码：4079-4083
• 全文大小：279K
• 年卷期：0
• ISSN：2168-0485

文摘

Methods for recovering raw materials from end-of-life solar panels were studied. A process for removing the hazardous element lead (Pb) in solar panels was also investigated. We achieved recovery rates of 80%, 79%, and 90% for Si, Cu, and Ag. We also achieved a removal rate of 93% for Pb. We immersed the cells in 5 M nitric acid solution under agitation at 200 rpm to dissolve the metals. We sequentially recovered Si, Cu, Ag, Al, and Pb. To recover Si, a process for removing the Al electrode and SiN_x layer was required. LIX84-I and 150 g/L H₂SO₄ solution were used to respectively extract and strip Cu. The purity of Ag powder after reduction Ag₂O was 99.7%. An electrolytic refining process increased the Ag purity to 99.99%. We were able to achieve a removal rate of 93% for Pb through neutralization and sulfurization.