当前位置: X-MOL 学术Metall. Mater. Trans. B. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Recovery and Purification of Silicon From Diamond Wire Saw Wasted Silicon Powder by a Technique of Induction Smelting Followed by Directional Solidification
Metallurgical and Materials Transactions B ( IF 3 ) Pub Date : 2022-05-27 , DOI: 10.1007/s11663-022-02561-y
Yunyang Zhu, Jijun Wu, Kuixian Wei, Wenhui Ma

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



中文翻译:

采用感应熔炼定向凝固技术从金刚石线锯废硅粉中回收提纯硅

本文介绍了一种在不使用添加剂的情况下,采用感应熔炼后定向凝固从金刚石线锯废硅粉中回收和提纯硅的技术。采用简单的感应熔炼和定向凝固法研究了硅反应和熔炼时间对硅粉废料去除杂质的影响。通过副产物和冷凝挥发物的检测,推测Si在冶炼过程中以一氧化硅的形式挥发除去。含有 Si、SiC 或 SiO 2的副产物挥发后,一氧化硅与石墨坩埚反应生成相。因为坩埚是用副产品密封的,坩埚中挥发性物质的流动会破坏硅熔体中的传质平衡。随着熔炼时间的延长,硅锭中残留杂质的数量呈下降趋势。该材料经过3次熔炼后获得了99%的除氧率。熔炼4小时后,硅锭杂质含量最低。经过简单的一步感应熔炼工艺,硅粉废料可以潜在地用作冶金级硅产品。通过定向凝固进一步提纯硅锭可将残留杂质降低至 74 ppmw。

更新日期:2022-05-27
down
wechat
bug