Boron separation from Si–Sn alloy by slag treatment
来源期刊：International Journal of Minerals Metallurgy and Materials2018年第12期
论文作者：Rowaid Al-khazraji Ya-qiong Li Li-feng Zhang
文章页码：1439 - 1446
摘 要：This study investigates a purification process for metallurgical-grade silicon（MG-Si） in which Si is alloyed with tin（Sn） and Ca O–Si O2–Ca Cl2 slag is used to remove boron（B） impurity. Acid leaching was performed to remove the Sn phase after slag refining to recover high-purity Si from the Si–Sn alloy. The effect of refining time was investigated, and acceptable refining results were realized within 15 min. The effects of slag composition and Sn content on the removal of B were also studied. The results indicate that increasing Sn content favors B removal. With the increase of Sn to 50% of the alloy, the final B content decreased to 1.1 × 10-4 wt%, 93.9% removal efficiency.
Rowaid Al-khazraji1,2，Ya-qiong Li1,2，Li-feng Zhang1,2
1. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing2. Beijing Key Laboratory of Green Recycling and Extraction of Metal, University of Science &Technology Beijing
摘 要：This study investigates a purification process for metallurgical-grade silicon（MG-Si） in which Si is alloyed with tin（Sn） and Ca O–Si O2–Ca Cl2 slag is used to remove boron（B） impurity. Acid leaching was performed to remove the Sn phase after slag refining to recover high-purity Si from the Si–Sn alloy. The effect of refining time was investigated, and acceptable refining results were realized within 15 min. The effects of slag composition and Sn content on the removal of B were also studied. The results indicate that increasing Sn content favors B removal. With the increase of Sn to 50% of the alloy, the final B content decreased to 1.1 × 10-4 wt%, 93.9% removal efficiency.
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