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| Study on Recovery of Molybdenum from Waste CIGS Solar Cells with Stainless Steel Substrate |
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Received:August 05, 2021
Revised:August 09, 2021
Accepted:August 11, 2021
Published Online:November 19, 2021
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| DOI：doi：10.3969/j.issn.1007-7545.2021.12.014 |
| KeyWord:CIGS waste chips; oxidation leaching scrap; molybdenum extraction |
| Author | Institution |
| LI Tuo-fu |
矿冶科技集团有限公司 |
| JIN Ran-gong |
矿冶科技集团有限公司 |
| HUANG Hai-hui |
矿冶科技集团有限公司 |
| CHANG Yao-chao |
矿冶科技集团有限公司 |
| WANG Wei-zhen |
矿冶科技集团有限公司 |
| GAO Chong |
矿冶科技集团有限公司 |
| XU Xiao-hui |
矿冶科技集团有限公司 |
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| Abstract: |
| Molybdenum in waste copper indium gallium selenide (CIGS) thin film solar cell chips has high recovery value. A process of "oxidizing acid leaching - removal of selenium with sodium sulfite - extraction" was proposed to recover molybdenum in stainless-steel substrate CIGS solar cell chip. The results show that "hydrogen peroxide + sulfuric acid" can leach metal elements in coating without harming the stainless-steel substrate. Influence of solid-to-liquid ratio and amount of sulfuric acid on leaching was investigated. Under the optimal process conditions, leaching rate of majority metal elements in waste chips is more than 95%. "N235+isooctanol+kerosene" can extract molybdenum efficiently in acid leaching solution, but selenium will be co-extracted with molybdenum. After selenium precipitation using "sodium sulfite + hydrogen peroxide", molybdenum extraction rate can reach 98% above, while other metals are hardly extracted. This study provides an effective method for treatment of waste chips of copper indium gallium selenium thin-film solar cells on stainless steel substrates. |
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