Material processing, namely, carrying out processes for separating impurities from silicon carbide by fractionation processes, such as screening, classification, cyclone processes, flotation, sedimentation, centrifugation; Material processing, namely, removing impurities to produce silicon carbide powder extracted from grinding sludge, silicon carbide waste, and silicon carbide sintered scrap; Material processing in the nature of mechanical treatment of thermally-treated recycled silicon carb...