Abstract
The present study proposed a simple and highly effective method for removal of impurities from large-sized particle metallurgical-grade silicon (MG-Si) powders based on metal-assisted chemical leaching (MACL). The various leaching approaches (MACL, HF + H2O2 leaching, HF leaching, HCl leaching) were investigated for leaching behaviors of the main impurities (Fe, Al, Ca, Ti, Ni, V, Mn, and Cu). The leaching results show that the order of impurities’ removal efficiency, from highest to lowest, is MACL > HF − H2O2 leaching > HF leaching > HCl leaching. After MACL, The numerous micro-scale “channels” introduced by MACL which are beneficial for the removal of impurities, especially for the non-dissolving metal impurities, such as copper , calcium, and aluminum. It should be noted that the small amount of Cu mainly come from residual Cu nanoparticle and can be removed by simple acid washing.
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Acknowledgements
Financial support of this work from the National Natural Science Foundation of China (Grant No. 51504117, 61764009), the Program for Innovative Research Team in University of Ministry of Education of China (No. IRT_17R48), Yunnan Youth Fund Project (2016FD037), Talent Development Program of KUST(KKSY201563032), Analysis and Testing Foundation of Kunming University of Science and Technology (2018P20173102002).
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© 2019 The Minerals, Metals & Materials Society
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Xi, F. et al. (2019). Simple and Highly Effective Purification of Metallurgical-Grade Silicon Through Metal-Assisted Chemical Leaching. In: Wang, T., et al. Energy Technology 2019. The Minerals, Metals & Materials Series. Springer, Cham. https://doi.org/10.1007/978-3-030-06209-5_22
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DOI: https://doi.org/10.1007/978-3-030-06209-5_22
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