高纯金属硅吹气造渣除硼工艺研究

Blowing assisted slagging process for boron removing from high purity metallurgical silicon

高纯多晶硅是太阳能光伏产业的主要原材料,现阶段生产高纯多晶硅的主流技术为西门子法,但是该方法生产成本居高不下,因此探索低成本高纯多晶硅生产技术成为国内外的研究热点之一.目前低成本多晶硅生产技术主要是物理法,包括冶金法和重掺硅废料提纯法两种.冶金法生产太阳能级多晶硅的技术关键在于除硼.选择吹气造渣除硼工艺进行探索性试验研究,利用反应气体和熔渣、硅液中的硼发生氧化反应,从而达到除硼的目的,探索冶金法制备高纯多晶硅的新途径.

High purity polysilicon is the main raw materials m so,at lJmlOtUVUlta~, H, y. The Siemens method is widely used to produce polysilicon. But the high cost leads to exploring low cost production technology of high purity polysilicon at home and abroad. Low cost polysilicon production technologies at present are mainly physical methods, including metallurgy and heavy doped silicon waste purification. The technical difficulty of polysilicon production for solar energy application with metallurgical method is removing boron. In this study, blowing assisted slagging process for boron removing is tested. The boron in the slag and silicon melt is oxidized and removed through the reaction with gases, which provides a new technology for metallurgical preparation of high purity polysilicon.