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This study presents experiments on the removalRemoval of boronBoron (B) from molten siliconSilicon using CaO-SiO2-Al2O3 and CaO-SiO2-Al2O3-MgO slags under an Ar atmosphere at 1500 °C, with electrical current applied between the siliconSilicon and slag phases. MgO was added to the slag to adjust its basicity with an intention to improve the boronBoron absorption from molten siliconSilicon, reduce viscosityViscosity, and improve electrical conductivityConductivity of the slag. Under a constant electricity current of 1.25 A, the potential difference across the CaO-SiO2-Al2O3 slag varied between 4.0 and 6.0 V, whereas with MgO addition it stabilized at a lower value of 3.2 V. The presence of MgO in the molten slag significantly lowered the viscosityViscosity and enhanced the electrical conductivityConductivity of the slag, but these did not appear to directly affect the boronBoron removalRemoval performance.

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The Effect of MgO Addition on the Performance of CaO-SiO2-Al2O3 Slag for Electrically-Enhanced Silicon Refining

  • 会议论文

  • 发表日期：

    2026年

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  • A. D. P. Putera,
  • M. A. Rhamdhani

摘要

This study presents experiments on the removalRemoval of boronBoron (B) from molten siliconSilicon using CaO-SiO2-Al2O3 and CaO-SiO2-Al2O3-MgO slags under an Ar atmosphere at 1500 °C, with electrical current applied between the siliconSilicon and slag phases. MgO was added to the slag to adjust its basicity with an intention to improve the boronBoron absorption from molten siliconSilicon, reduce viscosityViscosity, and improve electrical conductivityConductivity of the slag. Under a constant electricity current of 1.25 A, the potential difference across the CaO-SiO2-Al2O3 slag varied between 4.0 and 6.0 V, whereas with MgO addition it stabilized at a lower value of 3.2 V. The presence of MgO in the molten slag significantly lowered the viscosityViscosity and enhanced the electrical conductivityConductivity of the slag, but these did not appear to directly affect the boronBoron removalRemoval performance.