发明名称 |
A PROCESS FOR THE RECYCLING OF HIGH PURITY SILICON METAL |
摘要 |
<p>A process for the re-use of remainders or other residual Si of high purity silicon such as saw dust or kerf from manufacturing of solar cells wafers or semi-contductor devices, is characterized in that the dry kerf, chips and/or other residual Si from wafer production processes or semi-conductor devices is used as feedstock together with metallurgical grade silicon in a direct chlorination reactor (1) producing silicon tetrachloride, SiCI4. Un- reacted kerf or other small particles that escape the reaction zone unreacted are repeatedly returned to the reactor for further chlorination regardless of their size. The equipment included in the process may, beyond the reactor (1), comprise a storage and mixing device (2) for the mixing and storage of the Si material/kerf, a recovery device (3) for separation and recovery of Si containing particles escaping the reaction zone of the reactor and being returned to the reaction zone of the reactor by a return feeding means (9), a condensation unit (10) in which the smallest sized particles escaping the reaction zone of the reactor and recovery device are collected in a slurry with the liquid SiCI4, and a mixing unit (13) into which additional kerf, chips and other residual Si from wafer production processes or semi-conductor devices is added and mixed with the existing SiCI<SUB>4</SUB>/Si slurry that is subsequently added directly to the reaction zone of the reactor for cooling and temperature control.</p> |
申请公布号 |
WO2008133525(A1) |
申请公布日期 |
2008.11.06 |
申请号 |
WO2008NO00141 |
申请日期 |
2008.04.18 |
申请人 |
NORSK HYDRO ASA;BAKKE, PER;GIBALA, ROBERT;SVALESTUEN, JORILD, MARGRETE;OL, GRETE, VIDDAL |
发明人 |
BAKKE, PER;GIBALA, ROBERT;SVALESTUEN, JORILD, MARGRETE;OL, GRETE, VIDDAL |
分类号 |
C01B33/107;C07F7/02;H01L31/18 |
主分类号 |
C01B33/107 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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