Recycling of silicon from waste PV diamond wire sawing silicon powders: A strategy of Na2CO3-assisted pressure-less sintering and acid leaching

• Published in: Waste management (Elmsford) 2023-08, Vol.168, p.107-115
• Main Authors: Zou, Qipeng, Huang, Liuqing, Chen, Weinan, Chen, Guangyu, Li, Yan, Li, Mengchen, Zhang, Chentong, Luo, Xuetao
• Format: Article
• Language: English
• Subjects: Acid Leaching, Impurity Al; carbon dioxide; Diamond wire sawing silicon powder; evaporation; industry; liquids; Na2CO3-assisted liquid phase sintering; oxidation; perlite; Photovoltaic waste utilization; silicon; slags; solid wastes; transportation; waste management
• ISSN: 0956-053X; 1879-2456
• DOI: 10.1016/j.wasman.2023.05.046

•A strategy for the Si recovery and Al removal from DWSSP was proposed.•The main impurity Al in DWSSP was derived from perlite filter aid.•The introduction of Na2CO3 can create impurity-trapped LPS-layer on DWSSP.•The elimination mechanism of impurity Al from DWSSP-ceramic was studied.•The strategy has the potential for DWSSP utilization in the PV industry. Recycling diamond wire sawing silicon powders (DWSSP) from photovoltaic (PV) silicon wafers production has become an urgent problem. The challenge of recovery is the surface oxidation and contamination of the ultra-fine powder with impurities during the sawing and collection process. In this study, a clean recovery strategy of Na2CO3-assisted sintering and acid leaching was proposed. Due to the Al contamination from the perlite filter aid, the introduced Na2CO3 sintering aid can react with the SiO2 shell of DWSSP to form a slag phase with accumulated impurity Al during the pressure-less sintering process. Meanwhile, the evaporation of CO2 contributed to the formation of ring-like pores surrounded by a slag phase, which can be easily removed by acid leaching. When 15 % Na2CO3 was added, the content of impurity Al in DWSSP could be reduced to 0.07 ppm with a removal rate of 99.9 % after acid leaching. The mechanism suggested that the addition of Na2CO3 can trigger the liquid phase sintering (LPS) process of the powders, and the cohesive force and liquid pressures difference generated during the process facilitated the transportation of impurity Al from the SiO2 shell of DWSSP to the formed liquid slag phase. The efficient silicon recovery and impurity removal of this strategy demonstrated its potential for solid waste resource utilization in the PV industry.