| 摘要 |
The present invention relates to a method and equipment for production of high purity silicon by reduction of SiCl4 with molten Zn metal. The method is characterized in that the reduction takes place in contact with a molten salt that dissolves ZnCl2. The ZnCl2 produced during the reduction then dissolves in the molten salt rather than evaporates. The advantage is that gas evolution during the reduction is minimised, leading to higher utilisation of the SiCl4 and Zn and thereby a higher Si yield. Another advantage is that the molten salt efficiently protects the air sensitive materials, Zn, SiCl4 and Si, from oxidation during the reduction. The resulting molten salt containing the ZnCl2 can be used for electrolysis of ZnCl2 to regenerate the Zn metal. Chlorine evolved during the electrolysis can be used to produce SiCl4.
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