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Meeting 2018 TMS Annual Meeting & Exhibition
Symposium Solar Cell Silicon
Presentation Title The Mechanism of Boron Removal from Silicon Alloy by Electric Field Using Slag Treatment
Author(s) Junhao Liu, Zhi Wang, Zhi Ge, Bing Du
On-Site Speaker (Planned) Junhao Liu
Abstract Scope Stubborn nonmetallic impurity boron is the most difficult to be removed by the metallurgical route for solar grade silicon production. To break through the restriction of separation of trace impurity, a novel approach by applying an electrical potential between the slag and the solvent phases to enhance silicon alloy refining using slag was developed. For silicon, Al-Si, and Sn-Si system, the removal efficiency of B increased with the augment of the external potential. When the external potential was increased to 6 V, the partition ratio of boron increased to 5.7, which was ten times than that without the external potential applied. Under the constant external potentials, the boron content decreased with increasing refining time. In addition, the synergistic removal mechanism of boron with electric field was investigated for the first time and the reactions both at the cathode and anode were explored, providing theoretical support for this new purification process.
Proceedings Inclusion? Planned:

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

Boron Removal from Ferrosilicon Alloy via Slag Treatment
Crystal Growth Mechanism of Si in Hypereutectic Al-Si Melt during the Electromagnetic Directional Solidification
Enhancement of Efficiency in Nanostructured-Si Solar Cells by Employing Doped-graphene Transparent Conductive Electrodes
Influence of Chemical and Heat Treatment on the Properties of Disi Raw Sandstones in Jordan
K-17: High Temperature Pressure Filtration Applying for Separation of Silicon and Liquation Agent
K-18: Leaching of Indium from ITO Present in Amorphous Silicon Photovoltaic Modules
K-19: The Effect of Rapid Heat Treatment on Crystal Defect Evolution and Electrical Properties of the Original High Efficient Polycrystalline Silicon
Removal Impurities from Metallurgical Silicon by Slag Treatment Combined with Acid Leaching
Review of Solar Silicon Recycling
Solar Silicon by Direct Carbothermic Reduction - Review and Outlook
Structure Nature of Boron Removal from Silicon in Slagging Refining: A Raman Spectroscopy and NMR Spectroscopy Study
The Mechanism of Boron Removal from Silicon Alloy by Electric Field Using Slag Treatment
Thermo-Calc of the Phase Diagram of Calcium Silicon (Ca-Si) System
Thermo-Calc of the Phase Diagram of the Fe-Si System
Three-dimensional Crystal-plasticity based Model for Intrinsic Stresses in Multi-junction Photovoltaic

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