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Novel and efficient purification of silicon through ultrasonic-Cu catalyzed chemical leaching

Fengshuo XiFaculty of Metallurgical and Energy Engineering/State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Kunming University of Science and Technology, Kunming 650093, China; Institute of New Energy/Silicon Material Industry Research Institution (Innovation Center) of Yunnan Province, Kunming 650093, ChinaHongqi CuiFaculty of Metallurgical and Energy Engineering/State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Kunming University of Science and Technology, Kunming 650093, ChinaZhao ZhangFaculty of Metallurgical and Energy Engineering/State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Kunming University of Science and Technology, Kunming 650093, China; Institute of New Energy/Silicon Material Industry Research Institution (Innovation Center) of Yunnan Province, Kunming 650093, ChinaZhenmiao YangFaculty of Metallurgical and Energy Engineering/State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Kunming University of Science and Technology, Kunming 650093, ChinaShaoyuan LiFaculty of Metallurgical and Energy Engineering/State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Kunming University of Science and Technology, Kunming 650093, China; Institute of New Energy/Silicon Material Industry Research Institution (Innovation Center) of Yunnan Province, Kunming 650093, China. Electronic address: [email protected]Wenhui MaFaculty of Metallurgical and Energy Engineering/State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Kunming University of Science and Technology, Kunming 650093, China; Institute of New Energy/Silicon Material Industry Research Institution (Innovation Center) of Yunnan Province, Kunming 650093, China. Electronic address: [email protected]Kuixian WeiFaculty of Metallurgical and Energy Engineering/State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Kunming University of Science and Technology, Kunming 650093, China; Institute of New Energy/Silicon Material Industry Research Institution (Innovation Center) of Yunnan Province, Kunming 650093, ChinaZhengjie ChenFaculty of Metallurgical and Energy Engineering/State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Kunming University of Science and Technology, Kunming 650093, China; Institute of New Energy/Silicon Material Industry Research Institution (Innovation Center) of Yunnan Province, Kunming 650093, ChinaYun LeiFaculty of Metallurgical and Energy Engineering/State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Kunming University of Science and Technology, Kunming 650093, China; Institute of New Energy/Silicon Material Industry Research Institution (Innovation Center) of Yunnan Province, Kunming 650093, ChinaJijun WuFaculty of Metallurgical and Energy Engineering/State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Kunming University of Science and Technology, Kunming 650093, China; Institute of New Energy/Silicon Material Industry Research Institution (Innovation Center) of Yunnan Province, Kunming 650093, China

2019en

ABI

Annotatsiya

The present study proposed a novel and efficient ultrasonic-Cu catalyzed chemical leaching (U-CuCCL) method to purify large-sized industrial silicon powders. Different from the traditional ultrasonic-HF (U-HF) leaching method, U-CuCCL and U-CuCCL combined rapid thermal processing (U-CuCCL + RTP) were performed to investigate the efficiency of removing the main impurities Fe, Al, Ca, Ti, Ni, V, Cu, and Mn. The evolution of typical precipitates phases on the surface of silicon before and after leaching were observed and analyzed by electron probe micro analyzer. The results show that the impurities removal can be significantly improved under the ultrasonically strengthen process, especially the U-CuCCL process shows a high-efficient impurities removal efficiency. After the U-CuCCL, the etched silicon powders accompanied with numerous porous structure are obtained which is beneficial for the removal of impurities. Notably, it was found that the rapid thermal processing is beneficial for the residual impurities diffuse to the porous layer surface and the purity of silicon powder can be significantly increased from 99.3% to 99.995%.

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DOI: 10.1016/j.ultsonch.2019.04.040

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