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

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,...

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Bibliographic Details
Published in:Metallurgical and materials transactions. B, Process metallurgy and materials processing science Process metallurgy and materials processing science, 2018-08, Vol.49 (4), p.1699-1708
Main Authors: Jakobsson, Lars Klemet, Tangstad, Merete
Format: Article
Language:English
Subjects:
Activity coefficients
Aluminum oxide
Boron
Boron oxides
Calcium oxide
Characterization and Evaluation of Materials
Chemistry and Materials Science
Dilution
Magnesium oxide
Materials Science
Metallic Materials
Metallurgy
Nanotechnology
Parameters
Partial pressure
Silicon dioxide
Slag
Structural Materials
Surfaces and Interfaces
Thermodynamic properties
Thin Films
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Summary: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-Al 2 O 3 -SiO 2 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.
ISSN:1073-5615
1543-1916
DOI:10.1007/s11663-018-1250-7