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Boron Removal from Metallurgical-Grade Silicon by Slag Refining and Gas Blowing Techniques: Experiments and Simulations

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Abstract

To enhance the removal of B from metallurgical-grade Si (MG-Si) by the CaO-SiO2-CaCl2 slag refining technique, Ar gas was injected during the refining process. The effects of the refining time, Ar gas flow rate, and the blowing-pipe immersion depth on the removal of B from MG-Si were studied. The results show that the injection of Ar gas can effectively stir and then mix the Si and slag phases, resulting in an increase in the Si/slag contact area and in an acceleration of the mass transfer rate of B. With the combined slag-refining and Ar gas-blowing approach, the reaction time for the removal of B was reduced to 5 min from 75 min required with the slag-refining approach. Correspondingly, the content of B was reduced from 23.91 to 10.42 ppmw, with a removal efficiency of 56.42%. The results were confirmed by the coupled large-eddy simulation model and the volume of fluid multiphase flow model.

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Acknowledgments

The authors are grateful for support from the National Natural Science Foundation of China (No. 51604023), the Fundamental Research Funds for the Central Universities (No. FRF-TP-18-029A1), the USTB-NTUT Joint Research Program, the High Steel Center (HSC) at Yanshan University, the Beijing International Center of Advanced and Intelligent Manufacturing of High Quality Steel Materials (ICSM), the Beijing Key Laboratory of Green Recycling and Extraction of Metals (GREM), and the High Quality Steel Consortium (HQSC) at the University of Science and Technology Beijing (USTB), China.

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Authors and Affiliations

  1. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing, 100083, China

    Yaqiong Li, Wei Chen, Jun Lu & Xunhui Lei

  2. Beijing Key Lab of Green Recycling and Extraction of Metals, Beijing, 100083, China

    Yaqiong Li, Wei Chen, Jun Lu & Xunhui Lei

  3. State Key Lab of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao, 066004, China

    Lifeng Zhang

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  1. Yaqiong Li
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  2. Wei Chen
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  3. Jun Lu
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Li, Y., Chen, W., Lu, J. et al. Boron Removal from Metallurgical-Grade Silicon by Slag Refining and Gas Blowing Techniques: Experiments and Simulations. J. Electron. Mater. 50, 1386–1396 (2021). https://doi.org/10.1007/s11664-020-08651-4

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