Beneficiation and mineral processing of sand and silica sand
Mar 22, 2016 · 55. Lely process To make Pure SiC crystal, in which SiC powder is sublimated into high temperature species of silicon, carbon, silicon dicarbide (SiC2), and disilicon carbide (Si2C) in an argon gas ambient at 2500oC and redeposited into flakelike single crystals, sized up to 2×2 cm, at a slightly colder substrate.