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Boron removal from metallurgical-grade silicon by CaO–SiO_2 slag refining

Rare Metals 2015年第7期34卷 522-526页

作者： Kui-Xian Wei Hai-Fei Lu Wen-Hui Ma Yan-Long Li Zhao Ding Ji-Jun Wu Yong-Nian Dai The National Engineering Laboratory for Vacuum Metallurgy and State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization Kunming University of Science and Technology Key Laboratory for Nonferrous Vacuum Metallurgy of Yunnan Province and Engineering Research Center for silicon Metallurgy and silicon Materials of Yunnan Provincial Universities Kunming University of Science and Technology

Boron removal from metallurgical-grade silicon(MG-Si) using CaO–SiO2 slag was studied by employing a medium-frequency electromagnetic induction furnace.The relationship between the optical basicity(K)of the CaO–SiO2 slag and the distribution coefficient of boron(LB) was investigated.Consequently, the local minimum and maximum LBvalues of 0.72 and 1.58 are obtained when K = 0.56 and K = 0.71, respectively.The boron content in MG-Si decreases gradually with refinement time increasing, down to a minimum value of4.73 9 10-6.The controlling step in the removal of boron from MG-Si is not the chemical reaction at the interface of the slag and silicon.Instead, the controlling step is a diffusion mass transfer, in which boron impurities diffuse from molten silicon to the interface of the slag and silicon,or B2O3 formed by the chemical reaction diffuses from the slag–silicon interface to molten slag.

关键词： metallurgical-grade silicon Boron removal Slag ref

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Numerical Simulation for Induction Refining Process of metallurgical-grade silicon in Vacuum Furnace

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Journal of Iron and Steel Research(International) 2012年第S1期19卷 77-81页

作者： L Guo-qiang MA Wen-hui WANG Hua YU Wen-zhou YANG Xi Faculty of Metallurgy and Energy Engineering Kunming University of Science and Technology National Laboratory for Vacuum Metallurgy Kunming University of Science and Technology MOE's Engineering Research Center of metallurgical Energy Conservation and Emission Reduction Kunming University of Science and Technology

The temperature and velocity distribution of melting pool fields is very important effect to the silicon purification in vacuum induction furnace.A numerical model for the electromagnetic-thermal-hydrodynamic coupling fields have been developed by using the finite element method(FEM)and a 2D numerical simulation for electromagnetic、 temperature and velocity fields of metallurgical-grade silicon melting in vacuum induction furnace were performed with a software Multi-physics Comsol 3.5a in this paper.The results showed that the temperature field was dependent observably on input power of coils and induction heating times and the maximum temperature gradient in melting pool was 215K in holding time.With the silicon molted gradually a clockwise vortex was come into being for electromagnetic stirring in the smelting poor.The variation of velocity field in melting silicon is mainly influenced with the change of the current intensity and power frequency.The numerical predications of temperature distribution are in good agreement with experiments.

关键词： metallurgical-grade silicon vacuum induction refining multi-fields coupling numerical simulation

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Boron Removal From metallurgical-grade silicon Using CaO-SiO_2 Slag

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Journal of Iron and Steel Research(International) 2012年第S2期19卷 762-765页

作者： DING Zhao WEI Kui-xian MA Wen-hui WU Ji-jun XIE Ke-qiang ZHOU Yang The National Engineering Laboratory for Vacuum Metallurgy Faculty of Metallurgical and Energy Engineering Kunming University of Science and Technology Engineering Research Center for silicon Metallurgy and silicon Materials of Yunnan Provincial Universities Kunming University of Science and Technology

The removal of boron impurity from metallurgical-grade silicon for solar cell application in slag system of CaO-SiO_2 is investigated.The experiments are conducted in an electromagnetic induction furnace which is used to heat. The distribution coefficient of boron(L_B)between slag and silicon phase is particularly examined in terms of the optical basicity of slag.With the increase of optical basicity,L_B increases to a local maximum value of 1.58 when the optical basicity is 0.71 after getting to the minimum value of 0.72 when the optical basicity is 0.56.In that above optical basicity of 0.71,L_B decrease sharply which indicates that increasing the basicity of slag is not always effective in boron removal from silicon.

关键词： metallurgical-grade silicon slag refining distribution coefficient boron CaO-SiO_2

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