摘要
Slag refining,as an important option for boron removal to produce solar grade silicon（SOG-Si） from metallurgical grade silicon（MG-Si）,has attracted increasing attention.In this paper,Na_2CO_3-SiO_2 systems were chosen as the sodium-based refining slag materials for boron removal from molten silicon.Furthermore,the effect of Al_2O_3 addition for boron removal was studied in detail,which showed that an appropriate amount of Al_2O_3 can help retention of the basicity of the slags,hence improving the boron removal rate.
Slag refining,as an important option for boron removal to produce solar grade silicon（SOG-Si） from metallurgical grade silicon（MG-Si）,has attracted increasing attention.In this paper,Na_2CO_3-SiO_2 systems were chosen as the sodium-based refining slag materials for boron removal from molten silicon.Furthermore,the effect of Al_2O_3 addition for boron removal was studied in detail,which showed that an appropriate amount of Al_2O_3 can help retention of the basicity of the slags,hence improving the boron removal rate.
