The mechanism of boron removal in the CaO-SiO2-Al2O3 slag system for SoG-Si

Eun Jin Jung; Byung Moon Moon; Seong Ho Seok; Dong Joon Min

doi:10.1016/j.energy.2013.08.010

The mechanism of boron removal in the CaO-SiO₂-Al₂O₃ slag system for SoG-Si

Eun Jin Jung, Byung Moon Moon, Seong Ho Seok, Dong Joon Min

Department of Materials Science and Engineering

Research output: Contribution to journal › Article

21 Citations (Scopus)

Abstract

The dissolution behavior of boron in a molten slag was evaluated at 1773K to establish the boron removal mechanism from silicon refining for preparing higher purity solar-grade silicon. From the experimental results, a mechanism of boron removal from silicon into the CaO-SiO₂-Al₂O₃ slag system was confirmed to proceed via BO33- and B62- following a linear relationship with oxygen partial pressure in the slag system. In addition, the distribution ratio of boron was seen to increase with increasing slag basicity.6B+1/3O2-=B62-+1/6O2(g)The boride capacity of the CaO-SiO₂-Al₂O₃ slag can be expressed as a linear function of the activity of CaO and the optical basicity. It is suggested that the proposed dissolution mechanism of boron could be appropriate to slag systems, depending on oxygen partial pressure and basicity.

Original language	English
Pages (from-to)	35-40
Number of pages	6
Journal	Energy
Volume	66
DOIs	https://doi.org/10.1016/j.energy.2013.08.010
Publication status	Published - 2014 Mar 1

All Science Journal Classification (ASJC) codes

Civil and Structural Engineering
Building and Construction
Pollution
Mechanical Engineering
Industrial and Manufacturing Engineering
Electrical and Electronic Engineering

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Jung, E. J., Moon, B. M., Seok, S. H., & Min, D. J. (2014). The mechanism of boron removal in the CaO-SiO₂-Al₂O₃ slag system for SoG-Si. Energy, 66, 35-40. https://doi.org/10.1016/j.energy.2013.08.010

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abstract = "The dissolution behavior of boron in a molten slag was evaluated at 1773K to establish the boron removal mechanism from silicon refining for preparing higher purity solar-grade silicon. From the experimental results, a mechanism of boron removal from silicon into the CaO-SiO2-Al2O3 slag system was confirmed to proceed via BO33- and B62- following a linear relationship with oxygen partial pressure in the slag system. In addition, the distribution ratio of boron was seen to increase with increasing slag basicity.6B+1/3O2-=B62-+1/6O2(g)The boride capacity of the CaO-SiO2-Al2O3 slag can be expressed as a linear function of the activity of CaO and the optical basicity. It is suggested that the proposed dissolution mechanism of boron could be appropriate to slag systems, depending on oxygen partial pressure and basicity.",

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AB - The dissolution behavior of boron in a molten slag was evaluated at 1773K to establish the boron removal mechanism from silicon refining for preparing higher purity solar-grade silicon. From the experimental results, a mechanism of boron removal from silicon into the CaO-SiO2-Al2O3 slag system was confirmed to proceed via BO33- and B62- following a linear relationship with oxygen partial pressure in the slag system. In addition, the distribution ratio of boron was seen to increase with increasing slag basicity.6B+1/3O2-=B62-+1/6O2(g)The boride capacity of the CaO-SiO2-Al2O3 slag can be expressed as a linear function of the activity of CaO and the optical basicity. It is suggested that the proposed dissolution mechanism of boron could be appropriate to slag systems, depending on oxygen partial pressure and basicity.

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