The separation of refined silicon by gas pressure filtration combined with solvent refining was studied. The purified silicon grains were separated by gas pressure filtration under a pressure differential of 0.2 MPa. In all of the systems, Al-40%Si, Sn-40%Si, Cu-40%Si, and Fe-80%Si, the effect of separation temperature (T) on separation efficiency was evaluated. In Al-40%Si alloy, the silicon content in separated silicon was 91.3 wt% and the recovery rate of silicon was 97.6%, at T = 600°C. In Sn-40%Si alloy, almost all of the silicon was retained, and the silicon content in separated silicon was 79.4 wt% at T = 600°C. For Cu-40%Si alloy and Fe-80%Si alloy, the silicon content in separated silicon was over 75 wt% under high superheat. With efficient removal of impurities, the combination of gas pressure filtration and solvent refining is a promising method.
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