Evaporation Removal of Boron from Metallurgical-Grade Silicon Using CaO-CaCl2-SiO2 Slag

被引：37
|
作者：
Wang, Ye [1 ]
Ma, Xiaodong [2 ]
Morita, Kazuki [1 ]
机构：
[1] Univ Tokyo, Inst Ind Sci, Meguro Ku, Tokyo 1538505, Japan
[2] Univ Queensland, Sch Chem Engn, St Lucia, Qld, Australia
来源：
METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE | 2014年 / 45卷 / 02期
关键词：
SYSTEMS;
D O I：
10.1007/s11663-014-0031-1
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
In order to optimize the B removal during slag-refining process for solar-grade silicon production, a new process for the removal of B in molten Si was proposed based on the principle of oxidized chlorination and evaporation. B can be generated and evaporated in the form of B-containing gas on the basis of calculated vapor pressures of forming species in the BO1.5-CaCl2 slag at 1723 K (1450 degrees C). CaO-SiO2-CaCl2 slag was selected to remove B in molten Si. In the slag-refining experiments, compared with the binary systems of CaO-CaCl2 and SiO2-CaCl2 slag, the ternary slag system CaO-SiO2-CaCl2 showed a better potential (86 pct) for B removal. Furthermore, the relationships among the removal efficiency, the estimated evaporative efficiency, and the partition ratio were all discussed. (C) The Minerals, Metals & Materials Society and ASM International 2014
引用
收藏
页码：334 / 337
页数：4
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