Thermodynamics of Boron Removal from Silicon Using CaO-MgO-Al2O3-SiO2 Slags

被引：0
作者：
Lars Klemet Jakobsson
Merete Tangstad
机构：
[1] NTNU Norwegian University of Science and Technology,Department of Materials Science and Engineering
[2] Elkem Technology,undefined
[3] NTNU Norwegian University of Science and Technology,undefined
来源：
Metallurgical and Materials Transactions B | 2018年 / 49卷
关键词：
Boron Removal; Henrian Activity Coefficient; Slag Composition Changes; Distribution Coefficient; Intermediate Basicities;
D O I：
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中图分类号：
学科分类号：
摘要：
Slag refining is one of few metallurgical methods for removal of boron from silicon. It is important to know the thermodynamic properties of boron in slags to understand the refining process. The relation of the distribution coefficient of boron to the activity of silica, partial pressure of oxygen, and capacity of slags for boron oxide was investigated. The link between these parameters explains why the distribution coefficient of boron does not change much with changing slag composition. In addition, the thermodynamic properties of dilute boron oxide in CaO-MgO-Al2O3-SiO2 slags was determined. The ratio of the activity coefficient of boron oxide and silica was found to be the most important parameter for understanding changes in the distribution coefficient of boron for different slags. Finally, the relation between the activity coefficient of boron oxide and slag structure was investigated. It was found that the structure can explain how the distribution coefficient of boron changes depending on slag composition.
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页码：1699 / 1708
页数：9
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