Simultaneously removal of P and B from Si by Sr and Zr co-addition during Al–Si low-temperature solvent refining

Chen Chen; Jingwei Li; Qiuxia Zuo; Boyuan Ban; Jian Chen

doi:10.1007/s12613-022-2504-6

Volume 30 Issue 2

Feb. 2023

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2023 > 30(2): 365-377

Chen Chen, Jingwei Li, Qiuxia Zuo, Boyuan Ban, and Jian Chen, Simultaneously removal of P and B from Si by Sr and Zr co-addition during Al–Si low-temperature solvent refining, Int. J. Miner. Metall. Mater., 30(2023), No. 2, pp. 365-377. https://doi.org/10.1007/s12613-022-2504-6

Cite this article as:

Chen Chen, Jingwei Li, Qiuxia Zuo, Boyuan Ban, and Jian Chen, Simultaneously removal of P and B from Si by Sr and Zr co-addition during Al–Si low-temperature solvent refining, Int. J. Miner. Metall. Mater., 30(2023), No. 2, pp. 365-377. https://doi.org/10.1007/s12613-022-2504-6

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Research Article

Simultaneously removal of P and B from Si by Sr and Zr co-addition during Al–Si low-temperature solvent refining

+ Author Affiliations

1)
Key Lab of Photovoltaic and Energy Conservation Materials, Institute of Solid State Physics, HFIPS, Chinese Academy of Sciences, Hefei 230031, China
2)
University of Science and Technology of China, Hefei 230026, China
3)
School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, China
4)
State Key Laboratory of Mineral Processing, BGRIMM Technology Group, Beijing 100160, China
5)
State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Kunming University of Science and Technology, Kunming 650504, China
6)
Engineering Research Center of High Performance Copper Alloy Materials and Processing, Ministry of Education, Hefei University of Technology, Hefei 230009, China
7)
Shandong Aluminum Vocational College, Weihai 264400, China

Corresponding authors:
Boyuan Ban E-mail: jchen@ipp.ac.cn

Jian Chen E-mail: jchen@ipp.ac.cn
Received: 18 February 2022; Revised: 17 April 2022; Accepted: 18 April 2022; Available online: 19 April 2022

Abstract

Abstract

To remove the key impurity elements, P and B, from primary Si simultaneously, Sr and Zr co-addition to Al–Si alloy systems during solvent refining has been investigated. Sr reacts with Al, Si, and P in the melt to form a P-containing Al₂Si₂Sr phase and Zr reacts with B to form a ZrB₂ phase. In the Al–Si–Sr–Zr system, high removal fractions of P and B in the primary Si, with 84.8%–98.4% and 90.7%–96.7%, respectively, are achieved at the same time, respectively. The best removal effect is obtained in the sample with the addition of Sr-32000+Zr-3000 μg·kg^–1, and the removal fractions of P and B in the purified Si reach 98.4% and 96.1%. Compared with the Sr/Zr single-addition, the removal effects of Sr and Zr co-addition on P and B do not show a significant downward trend, indicating that the nucleation and growth of the B/P-containing impurity phases are mutually independent. Finally, an evolution model is proposed to describe the nucleation and the growth stages of Sr/Zr-containing compound phases, which reveals the interaction between the impurity phases and the primary Si.
- Al₂Si₂Sr phase;
- zirconium boride phase phase;
- directional solidification;
- solvent refining

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