Recovery and Purification of Silicon From Diamond Wire Saw Wasted Silicon Powder by a Technique of Induction Smelting Followed by Directional Solidification

A technique of induction smelting followed by directional solidification to recover and purify silicon from diamond wire saw waste powder without the use additives is presented herein. The reaction effect time on removal impurities were investigated using a simple method. Through detection byproducts condensed volatiles, it inferred that Si volatilized removed as monoxide during smelting. Byproducts containing Si, SiC, or SiO2 phases can be generated between graphite crucible after volatilization. Because sealed with byproducts, flow volatile materials in disrupts mass transfer balance melt. amount residual ingot trends downwards extension time. 99 pct oxygen rate was obtained material smelted three times. achieved lowest impurity content for 4 hours. potentially used metallurgical-grade product one-step process. Further purification reduce 74 ppmw.