Novel Application of Electroslag Remelting Refining in the Removal of Boron and Phosphorus from Silicon Alloy for Silicon Recovery

doi:10.1021/acssuschemeng.0c07150

	Novel Application of Electroslag Remelting Refining in the Removal of Boron and Phosphorus from Silicon Alloy for Silicon Recovery
	Qian, Guoyu 1; Sun, Yiwei 1; Wang, Zhi 1; Wei, Kuixian 2; Ma, Wenhui 2
刊名	ACS SUSTAINABLE CHEMISTRY & ENGINEERING
	2021-02-22
卷号	9 期号:7 页码:2962-2974
关键词	silicon waste powder recovery electroslag remelting B and P removal electroslag design dynamic interface
ISSN号	2168-0485
DOI	10.1021/acssuschemeng.0c07150
英文摘要	With the shortage of high-grade silicon (Si) feedstock due to the rapid development of photovoltaic, electronic information, and organic Si industries, there is an increasing demand to recycle Si waste economically and efficiently. However, the deep removal of B and P from Si has always been a significant challenge for Si waste recycling. A novel application of electroslag remelting (ESR) refining has been developed to remove B and P for the purification and recovery of Si. In addition, industrial tests were performed to recover the diamond wire saw Si powder. The design principle is put forward for the Si alloy electroslag system. A new 35% CaO-30% CaF2-17.5% Al2O3-17.5% SiO2 electroslag applicable for Si alloy ESR is designed to meet both physical and impurity removal requirements. Furthermore, the conductivity (2.67 Omega(-1).cm(-1)), density (2.97 g/cm(3)), and viscosity (0.05 Pa.s) meet the requirements of ESR. The dynamic refining process of Si alloy passing through the slag layer in the droplet form is the core of ESR refining, and it is found that more than 80% of B and P removal is achieved in the dynamic refining process of the droplet penetration slag. In order to understand the dynamic refining process, the mathematical model of droplet movement and impurity removal model are proposed to study the droplet movement behavior in slag and the competitive influence mechanism of multiple parameters on B removal efficiency during the dynamic refining process. Mathematical models and experimental results show that there is an ultimate velocity of droplet entry into the slag, which increases linearly with the growth of droplet size under the same slag condition. In addition, the specific surface area of the droplet plays a dominant role in the removal of B. The successful industrial experiments of Si alloy ESR prove that the design principle of the Si alloy electroslag system and the size control mechanism of Si alloy are feasible in this work. The removal efficiency of B and P reached 80 and 65%, respectively, within 30 min. It is also believed that ESR will have an application in purification and recovery of Si waste.
资助项目	National Key R&D Program of China[2018YFC1901801] ; National Natural Science Foundation of China[U1702251] ; National Natural Science Foundation of China[51934006] ; National Natural Science Foundation of China[51604256] ; Beijing Natural Science Foundation[2192055]
WOS研究方向	Chemistry ; Science & Technology - Other Topics ; Engineering
语种	英语
出版者	AMER CHEMICAL SOC
WOS记录号	WOS:000621667100033
资助机构	National Key R&D Program of China ; National Natural Science Foundation of China ; Beijing Natural Science Foundation
内容类型	期刊论文
源URL	[http://ir.ipe.ac.cn/handle/122111/47870]
专题	中国科学院过程工程研究所
通讯作者	Wang, Zhi
作者单位	1.Chinese Acad Sci, Key Lab Green Proc & Engn, Natl Engn Lab Hydromet Cleaner Prod Technol, Inst Proc Engn, Beijing 100190, Peoples R China 2.Kunming Univ Sci & Technol, Fac Met & Energy Engn, Kunming 650093, Yunnan, Peoples R China
推荐引用方式 GB/T 7714	Qian, Guoyu,Sun, Yiwei,Wang, Zhi,et al. Novel Application of Electroslag Remelting Refining in the Removal of Boron and Phosphorus from Silicon Alloy for Silicon Recovery[J]. ACS SUSTAINABLE CHEMISTRY & ENGINEERING,2021,9(7):2962-2974.
APA	Qian, Guoyu,Sun, Yiwei,Wang, Zhi,Wei, Kuixian,&Ma, Wenhui.(2021).Novel Application of Electroslag Remelting Refining in the Removal of Boron and Phosphorus from Silicon Alloy for Silicon Recovery.ACS SUSTAINABLE CHEMISTRY & ENGINEERING,9(7),2962-2974.
MLA	Qian, Guoyu,et al."Novel Application of Electroslag Remelting Refining in the Removal of Boron and Phosphorus from Silicon Alloy for Silicon Recovery".ACS SUSTAINABLE CHEMISTRY & ENGINEERING 9.7(2021):2962-2974.