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为提高硼的去除率,研究了电磁感应精炼过程中硼杂质在CaO-SiO_2-BaO-CaF_2四元渣和熔硅之间的分配系数LB,讨论了四元渣系中CaO/SiO_2质量比、BaO和CaF_2含量、熔炼时间对LB的影响规律。结果表明:随着CaO-SiO_2渣中BaO和CaF_2含量的增大,LB值增大。当CaO/SiO_2质量比为1.1:1、BaO和CaF_2含量分别为15%和20%时,CaO-SiO_2-BaO-CaF_2四元渣去除熔硅中硼杂质效果最好,LB达到最大值6.94,并且LB随着熔炼时间的延长而增大。经过两次造渣后,熔硅中硼含量由3.5×10~(-5)降到3.7×10~(-6),硼的去除率达到89.4%。
In order to improve the removal rate of boron, the partition coefficient LB of boron impurities between CaO-SiO_2-BaO-CaF_2 quaternary slag and fused silica in the process of electromagnetic induction refining was studied. The mass ratio of CaO / SiO_2 in quaternary slag system, BaO and CaF_2 content, influence of melting time on LB. The results show that with the increase of BaO and CaF 2 contents in CaO-SiO 2 slag, the LB value increases. When the CaO / SiO 2 mass ratio is 1.1: 1 and the contents of BaO and CaF 2 are 15% and 20% respectively, the removal efficiency of boron impurities in molten silicon by CaO-SiO_2-BaO-CaF_2 quaternary slag is the best, LB reaches the maximum of 6.94, And LB increases with the extension of melting time. After twice slagging, the content of boron in molten silicon decreased from 3.5 × 10 -5 to 3.7 × 10 -6, and the removal rate of boron reached 89.4%.