发明名称 |
AUFREINIGUNG VON SILICIUM METALLURGISCHER REINHEIT |
摘要 |
<p>The invention relates to a method for purification of metallurgical grade silicon where a calcium containing compound is added to molten silicon prior to or after the silicon is tapped from the furnace. The silicon is cast and solidified at a relatively high cooling rate and the solidified silicon is crushed and subjected to a purification process consisting of two leaching steps. In the first leaching step the silicon is treated with an aqueous solution of FeCl3 or FeCl3 and HCl which causes disintegration of the silicon, and in the second leaching step the silicon is treated with an aqueous solution of HF or HF/HNO3. Calcium-containing compound is added to the molten silicon in an amount necessary to provide between 0.3 and 0.95% by weight of calcium in the molten silicon and the weight ratio between Al and Fe in the molten silicon is regulated to between 0.5 and 2.0 by addition of aluminum to the molten silicon.</p> |
申请公布号 |
AT277866(T) |
申请公布日期 |
2004.10.15 |
申请号 |
AT20000978115T |
申请日期 |
2000.11.08 |
申请人 |
ELKEM ASA |
发明人 |
CECCAROLI, BRUNO;FRIESTAD, KENNETH |
分类号 |
C01B33/037;H01L31/18;(IPC1-7):C01B33/037 |
主分类号 |
C01B33/037 |
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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