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Meeting 2018 TMS Annual Meeting & Exhibition
Symposium Solar Cell Silicon
Presentation Title Structure Nature of Boron Removal from Silicon in Slagging Refining: A Raman Spectroscopy and NMR Spectroscopy Study
Author(s) Guoyu Qian, Zhi Wang
On-Site Speaker (Planned) Guoyu Qian
Abstract Scope Slag structure is important for the boron removal from silicon using slag refining. To study the correlation between slag structural and boron removal, the experiment of boron removal using CaO-SiOČ2-Na2O slags was carried out. Besides, slag structures were investigated by Raman and NMR spectroscopy. The results showed that when optical basicity increased from 0.6 to 0.66▒0.01, B2O3 could capture the non-bridging oxygen to incorporate into silicate network in the form of BO4 (1B, 3Si) and [3] B-3Si, which could reduce the activity of B2O3. Therefore, the boron removal rate increased with the increase of optical basicity. However, when optical basicity was increased to more than 0.66▒0.01, more Q2- could cut the Si-O-B key to separate the boron from silicon network, and the relative abundances of BO4 (1B, 3Si) decreased accordingly, which could lead to the increase of the activity of B2O3. Finally, the boron removal rate began to decrease.
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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