Removal of boron from metallurgical grade silicon by electromagnetic induction slag melting  

应用电磁感应造渣法去除冶金级硅中杂质硼(英文)

作　　者：罗大伟[1] 刘宁[1] 卢一平[1] 张国良[1] 李廷举[1,2] 

机构地区：[1]大连理工大学材料科学与工程学院,大连116024 [2]大连理工大学三束材料改性教育部重点实验室,大连116024

出　　处：《Transactions of Nonferrous Metals Society of China》2011年第5期1178-1184,共7页中国有色金属学报（英文版）

基　　金：Project (50674018) supported by the National Natural Science Foundation of China

摘　　要：A new purification process was developed to remove impurities in metallurgical grade silicon （MG-Si） by electromagnetic induction slag melting （EISM）. Vacuum melting furnace was used to purify boron in different slag systems. The results show that the removal effect in SiO2-CaO-Al2O3 systems is better than that in other slag systems by EISM. The boron content in MG-Si is successfully reduced from 1.5× 10^-5 to 0.2× 10^-5 during EISM at 1 823 K for 2 h. Meanwhile, Al, Ca and Mg elements in MG-Si are also well removed and their removal efficiencies reach 85.0%, 50.2% and 66.7%, respectively, which indicates that EISM is very effective to remove boron and metal impurities in silicon.提出一种新的提纯工艺即通过造渣与电磁感应熔炼相结合的方法来去除冶金级硅中的杂质硼。采用自行设计的真空感应熔炼炉进行不同造渣系条件下除硼的研究。结果表明,SiO2-CaO-Al2O3渣系的除硼效果优于其它渣系,在1823K经过2h精炼后,冶金级硅中的硼含量由原来的1.5×10-5降到0.2×10-5。同时冶金级硅中的Al,Ca和Mg杂质得到了精炼,去除率分别达到85.0%,50.2%和66.7%。表明电磁感应造渣法是一种非常有效的去除冶金级硅中的硼和其他一些金属元素杂质途径。

关 键 词：metallurgical grade silicon slag system partition ratio 

分 类 号：TN304.12[电子电信—物理电子学]