CP black silicon carbide is made of petroleum coke and high-quality silica as the main raw materials, and is smelted at high temperature in a resistance furnace. The smelted crystals are of high purity, high hardness, and are composed of α-type hexagonal crystals. After personalized crushing, shaping, pickling, alkali washing, fine classification and other special processes, CP sand has a high concentration, cleanliness and excellent hydrophilicity, and is a special material for coated abrasives.