| 摘要 |
<p>A method of refining particulate silicon is disclosed, where the method comprises mixing the particulate silicon with a slag forming compound in a weight ratio, particulate silicon: slag forming compound, from 1:10 to 3:1 in a crucible, wherein the slag forming compound will form a liquid slag at the operating temperature of the process that has a viscosity lower than 2 Ns/m2and a wetting angle towards silicon of at least 20°, heating the mixture of particulate silicon and slag forming component to a temperature above the liquidus temperature of the slag and the silicon, injecting a stream of gas through the bottom of the crucible and maintain the gas flushing for a period of time, solidifying and cooling the molten mixture, and separating formed silicon agglomerates/lumps from the slag. The slag forming compounds may be SiO2, CaO, Li2O, MgO, Na2O, CaF2, NaF, SrO, BaO, MgF2, K2O, CaCO3, Na2CO3or MgCO3.</p> |
