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Meeting 2018 TMS Annual Meeting & Exhibition
Symposium Solar Cell Silicon
Presentation Title Removal Impurities from Metallurgical Silicon by Slag Treatment Combined with Acid Leaching
Author(s) Zhenfei Xia, Jijun Wu, Wenhui Ma, Kuixian Wei, Yun Lei
On-Site Speaker (Planned) Jijun Wu
Abstract Scope Slag treatment and acid leaching are the effective methods to remove boron from metallurgical grade silicon (MG-Si) to solar grade silicon (SoG-Si) by metallurgical route. In order to prepare SoG-Si from MG-Si, a purification method to MG-Si using a CaO-SiO2-CaCl2 slag treatment combined with an acid leaching (HF-HCl) technique was studied in this paper. By studying different experimental conditions of slag basicity (CaO/SiO2), refining time and mass ratio of slag to silicon, the order of metallic impurity removal efficiency of Fe, Al, Ca, Ti was confirmed. The removal of non-metallic impurity boron in silicon was given priority to consideration. At the same time, the mechanism of imprities removal using the combined technique was studied and elaborated.
Proceedings Inclusion? Planned:


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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