Research Progress of Impurity Evolution Behavior in the Process of Industrial Silicon Secondary Refining Purification
Industrial silicon is an indispensable raw material in the photovoltaic silicon industry chain.It is of great significance to explore the evolution behavior of impurities during the refining process of industrial silicon for the deep removal of impurities.This paper reviews the thermodynamic and kinetic behavior of impurities in the process of blowing refining,slagging refining,and combined refining of industrial silicon,as well as the precipitati-on characteristics and occurrence behavior of impurity phases in the solidification process.The effect of secondary refining on removing impurities in industrial silicon is reviewed.Studies have shown that it is a very effective method to remove impurities B and P in industrial silicon by secondary refining,and the impurity content can reach the level of solar-grade silicon.In the solidification process of industrial silicon mold,the impurity content and composition,solidification rate,and refining temperature will affect the precipitation behavior of the impurity phase in industrial silicon.In addition,it is of great significance to carry out research on the removal of impurities such as Fe and Ti during the refining process and to establish the interaction between the precipitation character-istics of impurity phases and the removal rate during the solidification process,which is also a key factor to pro-mote the improvement of the refining technology level.
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