Boron removal from molten silicon using CaO-SiO2-BaO-CaF2 slag

被引：6

作者：

Sun, Jin-ling ^{[1
]}

Jie, Jin-chuan ^{[1
]}

Zou, Qing-chuan ^{[1
]}

Guo, Li-juan ^{[2
]}

Cao, Zhi-qiang ^{[1
]}

Wang, Tong-min ^{[1
]}

Li, Ting-ju ^{[1
]}

机构：

[1] Dalian Univ Technol, Sch Mat Sci & Engn, Dalian 116024, Peoples R China

[2] TDK Dalian Corp, Dalian 116024, Peoples R China

来源：

TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA | 2016年 / 26卷 / 12期

基金：

中国国家自然科学基金;

关键词：

metallurgical silicon; boron removal; CaO-SiO2-BaO-CaF2; METALLURGICAL GRADE SILICON; FLUX; THERMODYNAMICS; VISCOSITY; SYSTEM;

D O I：

10.1016/S1003-6326(16)64464-3

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

The distribution coefficient (L-B) of boron between CaO-SiO2-BaO-CaF2 slag and silicon was investigated using electromagnetic induction melting for the purpose of improving the boron removal fraction. The dependence of the boron distribution coefficient between slag and silicon on the fundamental parameters of CaO to SiO2 mass ratio and refining time and the additions of BaO and CaF2 to the slag was discussed. The results show that L-B can be increased by adding BaO and CaF2 to CaO-SiO2 slag. The maximum value of L-B (6.94) is obtained when the CaO to SiO2 mass ratio is 1.1:1 and the contents of BaO and CaF2 are fixed at 15% and 20%, respectively. Increasing the refining time increases the L-B. After the slag treatment is performed twice, the boron content of the silicon is successfully reduced from 3.5x10(-5) to 3.7x10(-6), and the removal fraction of boron reaches 89.4%.

引用

页码：3299 / 3304

页数：6

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