Chemical Treatment of Copper and Aluminum Derived from Waste Crystalline Silicon Solar Cell Modules by Mixed Acids of HNO3 and HCl

In this study, copper (Cu) and aluminum (Al) particles derived from waste crystalline silicon solar cell modules were etched with mixed acid containing HNO 3 and HCl, and the optimal mixing conditions were examined for the purpose of recovering silicon with high yield. The crushed particles of waste...

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Veröffentlicht in:Journal of sustainable metallurgy 2018-09, Vol.4 (3), p.378-387
Hauptverfasser: Matsubara, Teruaki, Uddin, Md. Azhar, Kato, Yoshiei, Kawanishi, Takanori, Hayashi, Yoshiaki
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container_title Journal of sustainable metallurgy
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creator Matsubara, Teruaki
Uddin, Md. Azhar
Kato, Yoshiei
Kawanishi, Takanori
Hayashi, Yoshiaki
description In this study, copper (Cu) and aluminum (Al) particles derived from waste crystalline silicon solar cell modules were etched with mixed acid containing HNO 3 and HCl, and the optimal mixing conditions were examined for the purpose of recovering silicon with high yield. The crushed particles of waste silicon solar cells were used after sieving between 450 and 600 μm particle size. The Cu etching rate decreased with the increasing HCl concentration in the region of HNO 3 /HCl ≧ 3.36, whereas it increased at HNO 3 /HCl 
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The rate-determining step of Cu and Al etchings was represented by the volume reaction model instead of the surface reaction model. The CuCl coating was observed on the residuals of Cu. The increasing HCl blocked the Cu etching, but the excess Cl − promoted the dissolution of CuCl due to complex formation, corresponding to the regions of HNO 3 /HCl ≧ 3.36 and HNO 3 /HCl &lt; 3.36, respectively. 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Azhar</creatorcontrib><creatorcontrib>Kato, Yoshiei</creatorcontrib><creatorcontrib>Kawanishi, Takanori</creatorcontrib><creatorcontrib>Hayashi, Yoshiaki</creatorcontrib><title>Chemical Treatment of Copper and Aluminum Derived from Waste Crystalline Silicon Solar Cell Modules by Mixed Acids of HNO3 and HCl</title><title>Journal of sustainable metallurgy</title><addtitle>J. Sustain. Metall</addtitle><description>In this study, copper (Cu) and aluminum (Al) particles derived from waste crystalline silicon solar cell modules were etched with mixed acid containing HNO 3 and HCl, and the optimal mixing conditions were examined for the purpose of recovering silicon with high yield. The crushed particles of waste silicon solar cells were used after sieving between 450 and 600 μm particle size. The Cu etching rate decreased with the increasing HCl concentration in the region of HNO 3 /HCl ≧ 3.36, whereas it increased at HNO 3 /HCl &lt; 3.36. The Al etching rate increased when HCl was added, although it was almost independent of the amount of HNO 3 . 99.6% silicon purity was achieved at the treatment time of 30 min. The rate-determining step of Cu and Al etchings was represented by the volume reaction model instead of the surface reaction model. The CuCl coating was observed on the residuals of Cu. The increasing HCl blocked the Cu etching, but the excess Cl − promoted the dissolution of CuCl due to complex formation, corresponding to the regions of HNO 3 /HCl ≧ 3.36 and HNO 3 /HCl &lt; 3.36, respectively. 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subjects Aluminum
Chemical treatment
Complex formation
Copper
Copper chloride
Crystal structure
Crystallinity
Earth and Environmental Science
Environment
Etching
Metallic Materials
Modules
Organic chemistry
Photovoltaic cells
Research Article
Silicon
Silicon wafers
Solar cells
Sustainable Development
title Chemical Treatment of Copper and Aluminum Derived from Waste Crystalline Silicon Solar Cell Modules by Mixed Acids of HNO3 and HCl
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