Abstract
Upgraded metallurgical grade silicon (Si) is available for high-efficiency solar cells. In the present article, Si refining with CaO-SiO2-CaF2 slags is carried out under open atmosphere, and orthogonal analysis is applied to evaluate the influencing factors. The results show that the influence order of the objective factors is: (1) slag/Si ratio > (2) refining time > (3) original slag basicity > (4) CaF2 content and that the slag/Si ratio acts as the key factor in boron removal. It is observed that boron decreases effectively within 30 min refining period. Moreover, the slags are pulverized when the basicity is > 1.39 because of the β-γ phase transition of Ca2SiO4, and the pulverization is beneficial to the separation of Si from slag.
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