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1. (WO2010118692) METHOD AND DEVICE FOR METALLURGICAL PURIFICATION USING LIQUID DROSS FILTER AND METHOD FOR PURIFYING POLYSILICON

Pub. No.:    WO/2010/118692    International Application No.:    PCT/CN2010/071794
Publication Date: Fri Oct 22 01:59:59 CEST 2010 International Filing Date: Fri Apr 16 01:59:59 CEST 2010
IPC: C30B 28/06
C30B 29/06
Applicants: NAN'AN SANJING SOLAR POWER CO., LTD.
南安市三晶阳光电力有限公司
ZHENG, Zhixiong
郑智雄
ZHANG, Weina
张伟娜
MA, Dianjun
马殿军
Inventors: ZHENG, Zhixiong
郑智雄
ZHANG, Weina
张伟娜
MA, Dianjun
马殿军
Title: METHOD AND DEVICE FOR METALLURGICAL PURIFICATION USING LIQUID DROSS FILTER AND METHOD FOR PURIFYING POLYSILICON
Abstract:
Disclosed are a method and a device for metallurgical purification using a liquid dross filter, the method comprises adding a given amount of metal or alloy with melting point lower than that of metal to be purified and density higher than that of metal to be purified during the directional solidification process for metallurgically purifying metals, wherein the metal or alloy with melting point lower than that of metal to be purified and density higher than that of metal to be purified forms a liquid dross filter during the cooling of ingots, a variety of impurities in the metal to be purified are filtered onto the surface of ingots along with the dross filter from bottom to top; the device comprises a vacuum oven body, a graphite crucible disposed within the oven body, a heat insulation cage disposed around the graphite crucible, a heater provided between the graphite crucible and the heat insulation cage, and a cooling system which aerates at fixed points and is located on the bottom. Also disclosed is a method for metallurgically purifying polysilicon using the liquid dross filter.