Method and device for manufacturing polycrystalline silicon by coupling electron beam smelting technology and directional solidification technology

Abstract

The invention belongs to the field of polycrystalline silicon purification and particularly relates to a method and device for manufacturing polycrystalline silicon by coupling the electron beam smelting technology and the directional solidification technology. According to the method and device for manufacturing the polycrystalline silicon by coupling the electron beam silicon smelting technology and the directional solidification technology, a traditional electron beam smelting manner is broken, only melting and initial electron beam smelting are performed in a melting tank of a melting crucible, and concentrated electron beam smelting is performed in a guiding zone. Due to the fact that silicon liquid can be spread in the guiding zone and the specific surface area is enlarged, the smelting effect of the electron beams is better. Due to the fact that the guiding zone is of a structure including downwards, the silicon liquid after being smelted and purified flows into a solidification crucible. In addition, the electron beam smelting and directional solidification can be well combined with the method and device for manufacturing the polycrystalline silicon so that electron beam smelting and directional solidification can be finished in one crucible, the process of primary solidification is removed, and breaking, cleaning and dying do not need to be performed again.

Description

Technical field [0001] The invention belongs to the field of polycrystalline silicon purification, and specifically relates to a method and device for preparing polycrystalline silicon by coupling electron beam melting and directional solidification technology. Background technique [0002] At present, our country has become a major energy producer and consumer in the world, but the per capita energy consumption level is still very low. With the continuous development of economy and society, my country's energy demand will continue to grow. In response to the current energy shortage, countries around the world are thinking deeply and working hard to improve energy utilization efficiency, promote the development and application of renewable energy, and reduce the use of energy. dependence on imported oil and enhance energy security. [0003] As one of the important development directions of renewable energy, solar photovoltaic power generation has developed rapidly in recent ...

AI Technical Summary

Problems solved by technology

However, in this process, directional solidification involves the melting and solidification process of silicon material, and directional solidification also involves the melting and solidification process of silicon material. At the same time, the silicon material processed in the previous step needs to be crushed, cleaned and dried. Going to the next step increases the overall investment, and at the same time, the production efficiency of the whole process is low

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