Xiong Baoshan, Han Shifeng, Yang Shicong, Xie Keqiang, Wei Kuixian, Ma Wenhui
Faculty of Metallurgical and Energy Engineering/National Engineering Research Center of Vacuum Metallurgy, Kunming University of Science and Technology, Kunming 650093, China.
State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Kunming University of Science and Technology, Kunming 650093, China.
Molecules. 2024 Nov 28;29(23):5645. doi: 10.3390/molecules29235645.
The photovoltaic (PV) industry is developing rapidly to support energy transformation and emission reduction. In the whole PV industry chain, diamond wire saw silicon powder (DWSSP) waste is the most promising secondary resource for recycling high-purity silicon. DWSSP mainly contains metal impurities, and the treatment process based on hydrometallurgy can effectively remove metal impurities. The current DWSSP recovery process was divided into three categories: direct acid leaching, pyrometallurgy followed by acid leaching, and acid leaching followed by pyrometallurgy. This paper gives a comprehensive overview of these three purification processes from the aspects of impurity removal and recovery yield. The results suggest that acid leaching followed by pyrometallurgy is currently the most effective process for removing metal impurities from DWSSP. Moreover, this study underscores the potential for enhancing the purity of reclaimed silicon through the application of external field reinforcement, oxygen-regulated acid leaching, and surfactant-facilitated organic acid leaching and points out the development direction for promoting silicon recovery from DWSSP.
光伏（PV）产业正在迅速发展，以支持能源转型和减排。在整个光伏产业链中，金刚石线锯硅粉（DWSSP）废料是回收高纯度硅最具潜力的二次资源。DWSSP主要含有金属杂质，基于湿法冶金的处理工艺可以有效去除金属杂质。目前DWSSP的回收工艺分为三类：直接酸浸、火法冶金后酸浸以及酸浸后火法冶金。本文从杂质去除和回收率方面对这三种提纯工艺进行了全面概述。结果表明，酸浸后火法冶金是目前从DWSSP中去除金属杂质最有效的工艺。此外，本研究强调了通过应用外场强化、氧调控酸浸和表面活性剂促进的有机酸浸来提高再生硅纯度的潜力，并指出了促进从DWSSP中回收硅的发展方向。
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