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在1500℃下将Al-Si合金与CaO-SiO_2-Al_2O_3熔渣复合精炼,考察了渣金质量比、精炼时间及渣系碱度对硅中B和P的去除效果,并分析了去除机理.结果表明,40%CaO-40%SiO_2-20%Al_2O_3(ω)熔渣和60%Al-Si(ω)合金在渣金质量比为5时,B和P的去除率分别为92.28%和91.14%.杂质去除过程主要集中在精炼的前30min,除B和P的传质系数分别为1.69×10~(-5)和1.47×10~(-5)m/s,延长精炼时间有利于B和P去除.改变渣系碱度,B和P的去除率呈规律性变化,质量比CaO:SiO_2为0.83时,B和P的去除率最大,分别为97.35%和94.24%.
The Al-Si alloy and CaO-SiO 2 -Al 2 O 3 slag were refined and synthesized at 1500 ℃. The effects of slag mass ratio, refining time and alkalinity of slag on the removal of B and P in silicon were investigated. The removal mechanism was also analyzed. The results show that the removal rates of B and P are 40.28% and 91.14%, respectively, for 40% CaO-40% SiO_2-20% Al_2O_3 (ω) slag and 60% Al-Si % .The removal of impurities mainly concentrated in the first 30min, except the mass transfer coefficients of B and P were 1.69 × 10 -5 and 1.47 × 10 -5 m / s respectively, prolonging the refining time was beneficial to B And P. The removal rate of B and P changed regularly with the change of alkalinity of slag system, and the removal rates of B and P were 97.35% and 94.24% respectively when the mass ratio of CaO: SiO_2 was 0.83.