磷杂质的去除是生产纯净度高的冶金级硅的关键。相对于传统方法,电磁悬浮精炼技术具有避免坩埚污染、使材料内部成分均匀、高温快速熔炼等特点,该方法可以实现硅铁合金中磷杂质的去除。通过控制悬浮氢还原气氛的浓度、悬浮时间及悬浮温度,探索了脱除硅铁合金中磷杂质的机理及效果。结果表明,当氢还原气氛为50% Ar-50% H₂、气体流量为1 000 mL/min、悬浮时间为2 700 s、悬浮温度为1 750℃时,硅铁合金的脱磷效果最好。

Removal of phosphorus impurities is important in producing metallurgical grade silicon with high purity.Compared with traditional metallurgical methods,the electromagnetic levitation refining technology can avoid crucible pollution,and make the material internal composition uniform,high temperature and fast melting,etc.This method can realize the removal of phosphorus impurities from ferrosilicon alloys.The mechanism and effect of removing phosphorus impurities from ferrosilicon alloys are explored through controlling the concentration of the hydrogen-reducing atmosphere,levitation time and levitation temperature.Results indicate that the best dephosphorization effect of ferrosilicon alloy is achieved when the hydrogen reducing atmosphere is 50% Ar-50% H₂,the gas flow is 1 000 mL·min^-1,the levitation temperature is at 1 750℃,and levitation time is 45 min.