Method for producing solar grade polysilicon by combined technology of molten salt electrolysis and directional solidification
A technology of directional solidification and molten salt electrolysis, applied in the field of metallurgy, can solve the problems of high energy consumption, impurity content can not meet the standard, harsh conditions, etc., to achieve the effect of eliminating process steps
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Embodiment 1
[0025] An industrialized production method for preparing solar-grade polysilicon by the combination technology of molten salt electrolysis and directional solidification. The following steps are followed: eutectoid molten salt electrolysis of aluminum-silicon alloy, directional solidification and separation of aluminum-silicon, vacuum smelting of high-purity silicon, and directional solidification ingot casting, etc. operate:
[0026] (1) Preparation of aluminum-silicon alloys by eutectoid molten salt electrolysis: use up-inserted graphite cathode rods and cylindrical graphite anode electrolytic cells, put industrial cryolite in the cell as electrolyte, pass through alternating current to generate arcs to provide heat, and wait for the cryolite When the melting temperature reaches 950-1000°C, an electrolytic aluminum ingot is placed at the bottom of the electrolytic tank and melted as the base metal, and then replaced with a 5kA direct current for pre-electrolysis. After 2-4 h...
Embodiment 2
[0034] An industrialized production method for preparing solar-grade polysilicon by the combination technology of molten salt electrolysis and directional solidification. The following steps are followed: eutectoid molten salt electrolysis of aluminum-silicon alloy, directional solidification and separation of aluminum-silicon, vacuum smelting of high-purity silicon, and directional solidification ingot casting, etc. operate:
[0035] (1) Preparation of aluminum-silicon alloy by eutectoid molten salt electrolysis: use the bottom cathode electrolytic cell, put industrial cryolite in the cell as the electrolyte, pass in alternating current to generate arc to provide heat, and wait until the cryolite melts and the temperature reaches 950-1000°C At the same time, the electrolytic aluminum ingot is placed at the bottom of the electrolytic tank and melted to make a liquid cathode, and then replaced with direct current for pre-electrolysis, the current density of the pre-electrolysis ...
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