发明授权
US08236266B2 Method and apparatus for purifying metallurgical silicon for solar cells
有权
用于净化太阳能电池的冶金硅的方法和装置
- 专利标题: Method and apparatus for purifying metallurgical silicon for solar cells
- 专利标题(中): 用于净化太阳能电池的冶金硅的方法和装置
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申请号: US13187282申请日: 2011-07-20
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公开(公告)号: US08236266B2公开(公告)日: 2012-08-07
- 发明人: Masahiro Hoshino , Cheng C. Kao
- 申请人: Masahiro Hoshino , Cheng C. Kao
- 代理机构: Ogawa P.C.
- 代理商 Richard T. Ogawa
- 优先权: CN099123949 20100721
- 主分类号: C01B33/021
- IPC分类号: C01B33/021
摘要:
A method for improving yield of an upgraded metallurgical-grade (UMG) silicon purification process is disclosed. In the UMG silicon (UMGSi) purification process, in a reaction chamber, purification is performed on a silicon melt therein by one, all or a plurality of the following techniques in the same apparatus at the same time, including: a crucible ratio approach, the addition of water-soluble substances, the control of power, the control of vacuum pressure, the upward venting of exhaust, isolation by high-pressure gas jet, and carbon removal by sandblasting, thereby reducing oxygen, carbon and other impurities in the silicon melt, meeting a high-purity silicon standard of solar cells, increasing yield while maintaining low cost, and avoiding EMF reduction over time. An exhaust venting device for purification processes is also disclosed, which allows exhaust to be vented from the top of the reactor chamber, thereby avoiding backflow of exhaust into the silicon melt and erosion of the reactor.
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