Investigation of Na2CO3-CaO-NaCl (or Na3AlF6) additives for the remanufacturing of silicon from diamond wire saw silicon powder waste

doi:10.1016/j.jclepro.2020.125525

	Investigation of Na2CO3-CaO-NaCl (or Na3AlF6) additives for the remanufacturing of silicon from diamond wire saw silicon powder waste
	Yang, Shicong 4; Wan, Xiaohan 4; Wei, Kuixian 2,4; Ma, Wenhui 1,2,4; Wang, Zhi 3
刊名	JOURNAL OF CLEANER PRODUCTION
	2021-03-01
卷号	286 页码:13
关键词	Diamond wire saw silicon powder waste Direct smelting Silicon remanufacturing Optimization of silicon recovery and impurity removal Na2CO3-CaO-NaCl (Or Na3AlF6) additives
ISSN号	0959-6526
DOI	10.1016/j.jclepro.2020.125525
英文摘要	The demand for high-quality silicon for solar cell preparation will continue to grow due to shortages of silicon feedstock driven by the photovoltaic industry. Consequently, the silicon lost in diamond wire saw silicon powder waste during silicon wafer production must be recovered for silicon production. Depending on the current yield of silicon and level of residual impurities, an optimization treatment for the increase of the recovery rate and purity of silicon collected from diamond wire saw silicon powder should be further developed. In this study, NaCl and Na3AlF6 are designed as additives to optimize Na2CO3-CaO to increase the silicon recovery rate and purity. The action mechanisms of NaCl and Na3AlF6 for silicon recovery and the removal of metal during the direct smelting process are investigated. It is found that NaCI and Na3AlF6 improve the silicon migration channels and stabilize the impurities in slag by reducing the slag viscosity and tuning the slag composition. After induction smelting at 1823 K for 2 h with the furnace feed mass ratios of Na2CO3 :CaO:NaCl = 12.8:1.7:8.6 and Na2CO3:CaO:Na3AlF6 = 12.8:1.7:8.6, the obtained silicon recovery rates were respectively 76.39% and 79.25%, and the silicon purities were respectively 99.985% and 99.986%. Therefore, NaCl and Na3AlF6 could be used as potential additives to promote the efficient remanufacturing of silicon collected from diamond wire saw silicon powder waste, and are technically and economically feasible for large-scale application. (C) 2020 Elsevier Ltd. All rights reserved.
资助项目	National Key Research and Development Program of China[2018YFC1901805] ; National Key Research and Development Program of China[2018YFC1901801] ; Program for Innovative Research Team in University of Ministry of Education of China[IRT-17R48] ; Major Science and Technology Projects in Yunnan Province[2019ZE007] ; Reserve Talents of Young and Middle-aged Academic and Technical Leaders in Yunnan Province[2018HB009] ; National Natural Science Foundation of China[51904134]
WOS研究方向	Science & Technology - Other Topics ; Engineering ; Environmental Sciences & Ecology
语种	英语
出版者	ELSEVIER SCI LTD
WOS记录号	WOS:000614537000019
资助机构	National Key Research and Development Program of China ; Program for Innovative Research Team in University of Ministry of Education of China ; Major Science and Technology Projects in Yunnan Province ; Reserve Talents of Young and Middle-aged Academic and Technical Leaders in Yunnan Province ; National Natural Science Foundation of China
内容类型	期刊论文
源URL	[http://ir.ipe.ac.cn/handle/122111/43358]
专题	中国科学院过程工程研究所
通讯作者	Wei, Kuixian; Ma, Wenhui
作者单位	1.Silicon Mat Ind Res Inst Yunnan Prov, Innovat Ctr, 68,Wenchang Rd 121 St, Kunming 650093, Yunnan, Peoples R China 2.Kunming Univ Sci & Technol, State Key Lab Complex Nonferrous Met Resources Cl, 68,Wenchang Rd 121 St, Kunming 650093, Yunnan, Peoples R China 3.Chinese Acad Sci, Inst Proc Engn, Natl Engn Lab Hydromet Cleaner Prod Technol, Key Lab Green Proc & Engn, 1 Beierjie, Beijing 100190, Peoples R China 4.Kunming Univ Sci & Technol, Natl Engn Lab Vacuum Met, Fac Met & Energy Engn, 68,Wenchang Rd 121 St, Kunming 650093, Yunnan, Peoples R China
推荐引用方式 GB/T 7714	Yang, Shicong,Wan, Xiaohan,Wei, Kuixian,et al. Investigation of Na2CO3-CaO-NaCl (or Na3AlF6) additives for the remanufacturing of silicon from diamond wire saw silicon powder waste[J]. JOURNAL OF CLEANER PRODUCTION,2021,286:13.
APA	Yang, Shicong,Wan, Xiaohan,Wei, Kuixian,Ma, Wenhui,&Wang, Zhi.(2021).Investigation of Na2CO3-CaO-NaCl (or Na3AlF6) additives for the remanufacturing of silicon from diamond wire saw silicon powder waste.JOURNAL OF CLEANER PRODUCTION,286,13.
MLA	Yang, Shicong,et al."Investigation of Na2CO3-CaO-NaCl (or Na3AlF6) additives for the remanufacturing of silicon from diamond wire saw silicon powder waste".JOURNAL OF CLEANER PRODUCTION 286(2021):13.