Material processing, namely, carrying out processes for separating impurities from silicon carbide by fractionation processes, such as screening, classification, cyclone processes, flotation, sedimentation, centrifugation; Purification of screened silicon carbide powder extracted in particular from grinding sludge or silicon carbide waste or SiC sintered scrap; Material processing by means of mechanical treatment of thermally treated recycled silicon carbide powder, such as mixing, grinding, ...