Including black silicon carbide calcined coke recarburizer and green silicon carbide, among them: black silicon carbide is made of quartz sand, petroleum coke and high-quality silica as the main raw materials, which are smelted at high temperature in a resistance furnace. Its hardness is between corundum and diamond, its mechanical strength is higher than corundum, and it is brittle and sharp. Green silicon carbide is made from petroleum coke and high-quality silica as the main raw materials, adding salt as an additive, and smelted at high temperature in a resistance furnace. Its hardness is between corundum and diamond, and its mechanical strength is higher than that of corundum. Commonly used silicon carbide abrasives have two different crystals, one is green silicon carbide, which contains more than 97% SiC, and is mainly used for grinding hard gold-containing tools. The other is black silicon carbide, which has metallic luster and contains more than 95% SiC. It is stronger than green silicon carbide, but has lower hardness. It is mainly used for grinding cast iron and non-metallic materials. High temperature asphalt
Coal, another natural mineral formed from carbon, has served mankind for thousands of years, and it still contributes heat and light to us. It can be said that because of the carbon element, nature has become vibrant. In the periodic table, silicon is directly below the carbon element. The content of silicon in the earth's crust is huge, but its elemental substance was not discovered and confirmed until the nineteenth century. In 1811, the French Gay-Lussac and Thénard prepared pure silicon for the first time, and it was confirmed as an element after the Swedish Berzelius made pure silicon again in 1823. Although it was born late, its role in the semiconductor and modern communications industries cannot be replaced. In the chemical world, carbon and silicon are two brothers in the same big family.
Stone tar recarburizer is used in casting, which can greatly increase the amount of scrap steel, reduce the amount of pig iron or not use pig iron. In the feeding method of electric furnace smelting, the recarburizer should be put in with the scrap steel and other charge, and small doses can be added to the surface of the molten iron. However, it is necessary to avoid large batches of materials into the molten iron to prevent excessive oxidation and the occurrence of insignificant recarburization effects and insufficient carbon content of the castings. The amount of recarburizer added is determined according to the ratio of other raw materials and the carbon content. For different types of cast iron, choose different types of recarburizers according to your needs. The characteristics of the recarburizer itself choose pure carbon-containing graphitized substances to reduce excessive impurities in the pig iron, and the appropriate selection of the recarburizer can reduce the production cost of castings.