| 摘要 |
<p>Disclosed is a novel method for producing high-purity silicon at low cost . Particularly disclosed is a novel method for producing high-purity silicon , which can be suitably used as a raw material for solar cells, at low cost. Specifically, a method for producing silicon wherein silica is subjected to molten salt electrolysis in an electrolysis vessel comprises, in the follow ing order, a step (1) wherein the silicon content in an silicon-containing a lloy, which is in a liquid phase at the electrolysis temperature, is increas ed by using the alloy as the cathode and performing electrolysis; a step (2) wherein the silicon-containing alloy serving as the cathode is taken out of the electrolysis vessel before it reaches the concentration at which silico n begins to precipitate at the electrolysis temperature; a step (3) wherein silicon is solidified by cooling the taken-out silicon-containing alloy with in the temperature range higher than the eutectic point but lower than the e lectrolysis temperature; and a step (4) wherein the solidified silicon is co llected.</p> |
