提出了一种将硅铝合金化与吹气精炼复合提纯冶金级硅的方法。在合金熔体 Ar?H2吹气精炼过程中，对硅中杂质相，尤其是硼和铁的形态及转变进行了分析和表征，并对除硼机制进行了讨论。实验结果表明：合金吹气(Ar?H2)精炼可以有效去除硅中的硼元素，细化初晶硅颗粒和增加形核点的数量，这有利于杂质元素的扩散迁移。与未通气合金样品相比，经过2.5 h 吹气精炼，硼的去除率由45.83%提高到74.73%。含硼杂质相主要是 TiB2、AlB2和 VB 金属间化合物，含铁杂质相主要是β-Al5FeSi 金属间化合物。同时，硅中部分硼与溶解的[H]结合以BxHy (BH, BH2)形式在电磁搅拌作用下，由合金熔体内部扩散到表面挥发，达到除硼的目的。
A new method about purification of metallurgical grade silicon (MG-Si) by a combination of Si?Al solvent refining and gas blowing treatment was proposed. The morphologies and transformation of impurity phases, especially for boron and iron in Si?Al melt were investigated during Ar?H2 gas blowing treatment. The mechanism of boron removal was discussed. The results indicate that gas blowing can refine grain size and increase nucleation of the primary Si. Boron can be effectively removed from MG-Si using the Ar?H2 gas blowing technique during the Si?Al solvent refining. Compared with the sample without gas blowing, the removal efficiency of boron increases from 45.83% to 74.73% after 2.5 h gas blowing. The main impurity phases containing boron are in the form of TiB2, AlB2 and VB compounds and iron-containing one is in the form of β-Al5FeSi intermetallic compound. Part of boron combines [H] to transform into gas BxHy (BH, BH2) and diffuses towards the surface of the melt and is volatilized by Ar?H2 gas blowing treatment under electromagnetic stirring.
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