Metall. Res. Technol.
Volume 115, Number 3, 2018
|Number of page(s)||7|
|Published online||19 July 2018|
Comparison between slag refining processes for B removal with metallurgical grade silicon and Si–Sn alloy
School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing (USTB),
Beijing, PR China
2 Beijing Key Laboratory of Green Recycling and Extraction of Metal, University Of Science & Technology Beijing, 100083 Beijing, PR China
* e-mail: email@example.com
Accepted: 17 May 2018
Boron (B) removal by slag refining using CaO–SiO2–CaCl2 was investigated in metallurgical-grade silicon (MG-Si) and 75 wt% Si–Sn alloy. Experiments were conducted at 1500 °C for 15 min. The microstructure was characterized before and after refining. The effects of acid leaching, basicity, and slag/Si mass ratio on B removal were investigated. Experimental results showed that acid leaching had no effect on B removal from MG-Si but had a clear effect on the refined Si–Sn alloy after slag refining. The final B concentration was highly affected by the CaO/SiO2 mass ratio with minimum value, where the content of B was reduced from 18.36 ppmw to 5.5 ppmw at the CaO/SiO2 = 1.2 for MG-Si slag refining and from 18.36 ppmw to 3.7 ppmw at CaO/SiO2 = 1.5 for 75 wt% Si–Sn alloy. Increasing the slag mass ratio by 2:1 mass ratio also increased B removal efficiency by approximately 15–20% more than an increase by 1:1.
Key words: B removal / metallurgical grade silicon / slag refining / acid leaching / slag
© EDP Sciences, 2018
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