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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。
A new purification process is proposed to remove impurity boron in metallurgical grade silicon through a combination of slagging and electromagnetic induction melting. Adopting self-designed vacuum induction melting furnace for boron removal under different slagging conditions. The results show that the boron removal efficiency of SiO2-CaO-Al2O3 slag system is better than that of other slag systems. After 2h refining at 1823K, the boron content of metallurgical silicon decreases from 1.5 × 10-5 to 0.2 × 10-5. At the same time, Al, Ca and Mg impurities in metallurgical grade silicon were refined with removal rates of 85.0%, 50.2% and 66.7% respectively. It shows that the electromagnetic induction slagging method is a very effective way to remove boron and some other metal elements in metallurgical grade silicon.