The larger SiC particles were removed in the first stage to obtain a Si-rich powder, which was then subject to a second-stage operation to remove the submicron SiC particles. The effects of the operating variables on the purity and recovery of the Si product were investigated, including the pH value of the water phase, oil/water volume ratio, and solid concentration. The best result obtained was 71.1% in overall recovery and 99.1 wt% in Si purity. Given the environmental concerns of the toxic heavy fluids used in centrifugation, Wu et al. [27] proposed an electrical technique, instead of centrifugation, to subsequently separate Si from slurries. They designed a cell for separating Si and SiC par- ticles in a buffer solution by gravity combined with electrical fields.