2015•Separation Science and TechnologyRequires access

Effects of Slag Refining on Boron Removal from Metallurgical- Grade Silicon Using Recycled Slag with Active Component

Chenghao Lu, Liuqing Huang, Huixian Lai, Ming Fang, Wenhui Ma, Pengfei Xing, Lei Zhang, Jintang Li, Xuetao Luo

Abstract

A new slag refining method to remove boron from metallurgical silicon (MG-Si) by mixed reused slag and active component was proposed. The silicon was refined with CaCl2-CaO-SiO2 slag system in this work. The boron removal efficiency under different temperature and holding time was investigated, particularly for the recycle of the used slag mixed with different amount of CaCl2 in the 2nd and the 3rd run. The multiple slag refining was adopted to test the effect of reused slag; the boron removal ratio was 96% and 94% at 1923 K and 1873 K, respectively. These methods could significantly reduce the slag amount in refining. The total transfer coefficient of boron was also derived by the boron content. The overall boron removal mechanism and effect of slag recycle on boron removal was also discussed.

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Key concepts: Boron, Slag (welding), Refining (metallurgy), Metallurgy, Silicon, Chemistry, Materials science, Organic chemistry