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The thermodynamics of boron extraction from liquid silicon using SiO2–CaO–MgO slag treatment

  • Jesse F. White , Carl Allertz and Sichen Du
Published/Copyright: March 30, 2014
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International Journal of Materials Research
From the journal International Journal of Materials Research Volume 104 Issue 3

Abstract

In the refining of solar-grade silicon using slag treatment, boron dissolved in the silicon is oxidized and rejected to a liquid oxide (slag) phase. In this study the partitioning of boron between liquid silicon and SiO2–CaO–MgO slags was examined at 1 873 K over a range of slag compositions and oxygen partial pressures. It was found that the distribution of boron is indeed dependent on both the slag composition and the oxygen partial pressure. The concentration of MgO seems to have little impact on the partition ratio.

Keywords: Silicon; Boron; Slag; Partition ratio; Oxygen potential
* Correspondence address, Prof. Du Sichen, Department of Materials Science and Engineering, KTH Royal Institute of Technology, Brinellvägen 23, SE-100 44 Stockholm, Sweden. Tel.: +46-(0)8-790 83 59, Fax: +46-(0)8-790 09 39, E-mail:

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Received: 2011-12-19
Accepted: 2012-8-16
Published Online: 2014-03-30
Published in Print: 2013-03-14

© 2013, Carl Hanser Verlag, München

Articles in the same Issue

  1. Contents
  2. Contents
  3. Original Contributions
  4. The thermodynamics of boron extraction from liquid silicon using SiO2–CaO–MgO slag treatment
  5. Viscosity estimation of semi-solid alloys based on thermal simulation compression tests
  6. Original Contributions
  7. Experimental study of phase equilibria in the “SnO”–CaO–SiO2 system in equilibrium with tin metal
  8. Prediction of the solidification path of Al-4.37Cu-27.02Mg ternary eutectic alloy with a unified microsegregation model coupled with Thermo-Calc
  9. Evaluation of the effective diffusion coefficient of boron in the Fe2B phase in the presence of chemical stresses
  10. Morphology evolution of γ′ precipitates in GTD-111 Ni-based superalloy with heat treatment parameters
  11. Hot forming of a new steel used in stamping dies and tooling
  12. Mechanical properties and corrosion behaviour of freestanding, precipitate-free magnesium WE43 thin films
  13. Sliding wear performance of Fe-, Ni- and Co-based hardfacing alloys for PTA cladding
  14. The suitability of selected austenitic stainless steels and hastelloy C276 alloys as substrates for thin film deposition using spray pyrolysis
  15. Synthesis, structural, optical and thermal analysis of nanostructured ZnO
  16. Electrical conductivity variation of (Bi2Te3)0.25(Sb2Te3)0.75 crystal grown using the zone melting method
  17. X-ray Absorption Near Edge Structure Studies of Pb1-xMnxTe(In, Ga) Systems
  18. DGM News
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  20. Grain refining of aluminium alloys and silicon by means of boron-nitride particles
https://doi.org/10.3139/146.110867
Keywords for this article
Silicon; Boron; Slag; Partition ratio; Oxygen potential

Articles in the same Issue

  1. Contents
  2. Contents
  3. Original Contributions
  4. The thermodynamics of boron extraction from liquid silicon using SiO2–CaO–MgO slag treatment
  5. Viscosity estimation of semi-solid alloys based on thermal simulation compression tests
  6. Original Contributions
  7. Experimental study of phase equilibria in the “SnO”–CaO–SiO2 system in equilibrium with tin metal
  8. Prediction of the solidification path of Al-4.37Cu-27.02Mg ternary eutectic alloy with a unified microsegregation model coupled with Thermo-Calc
  9. Evaluation of the effective diffusion coefficient of boron in the Fe2B phase in the presence of chemical stresses
  10. Morphology evolution of γ′ precipitates in GTD-111 Ni-based superalloy with heat treatment parameters
  11. Hot forming of a new steel used in stamping dies and tooling
  12. Mechanical properties and corrosion behaviour of freestanding, precipitate-free magnesium WE43 thin films
  13. Sliding wear performance of Fe-, Ni- and Co-based hardfacing alloys for PTA cladding
  14. The suitability of selected austenitic stainless steels and hastelloy C276 alloys as substrates for thin film deposition using spray pyrolysis
  15. Synthesis, structural, optical and thermal analysis of nanostructured ZnO
  16. Electrical conductivity variation of (Bi2Te3)0.25(Sb2Te3)0.75 crystal grown using the zone melting method
  17. X-ray Absorption Near Edge Structure Studies of Pb1-xMnxTe(In, Ga) Systems
  18. DGM News
  19. DGM News
  20. Grain refining of aluminium alloys and silicon by means of boron-nitride particles
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