Silicon carbide is a compound composed of one carbon atom and one silicon atom, in which silicon accounts for 70% and carbon accounts for 0% (by weight). It was accidentally discovered by Edward G Acheson when making synthetic diamond. Because it is very hard and can cut glass, metal and other materials, it was originally used as abrasive. Because it does not hydrolyze at almost anyone’s ambient temperature, and can be used as refractory material. Because it is also stable at low temperature, and has been widely used as the filling material for kilns. Because it can resist the erosion of slag, and can be used as slag line brick for aluminum smelting furnace and blast furnace. Because when it is melted with slag, hydrocarbon atoms and silicon hydrogen atoms will become charged ions (C-4 and Si+4) and be released, so it is also an effective deoxidizer widely used in ironmaking. When it is added to gray iron, Yao Xuejia or malleable stainless steel again, it is not only easy to melt, but also can make carbon and silicon enter the pipe wall in the form of alloy. When the ambient temperature is lower than 1620 ℃, its carbon will act as a deoxidizer to promote the reduction of unstable hydrolysates such as FeO and MnO through the reaction of SiC+FeO=Si+Fe+CO. When the ambient temperature is higher than 1620 ℃ (for example, during ironmaking), silicon will take on all the deoxidation tasks, while carbon will play a role in promoting carburetor, and its yield can reach 100%. Iron coreless induction beneficiation is the main application field of silicon carbide. In the United States, about 95% of coreless lithium bromide uses SiC as the main silicon source. In gray iron, Yao Xuejia and malleable stainless steel, SiC+FeO=Si+Fe+CO is used to reduce the concentration of FeO and MnO in slag.
Because the existence of FeO can make the boiling point of any slag rise, and at any given ambient temperature, because the boiling point of slag rises, more slag will become gas. For example, when the concentration of FeO in the slag is 10%, its boiling point will be 1350-1400 ℃. In addition, under the strong stirring promotion of coreless lithium bromide, this liquid slag will be “homogenized” in the pipe wall, leaving tens of thousands of very small slag particles in the pipe wall. Many surface defects of the mold are caused by the high FeO and MnO slag (generally referred to as manganese silicate slag) with good capital face being brought into the element. If SiC is added again, the FeO concentration of this slag will be reduced to 1 or 2%, and its boiling point will be raised to 1500-1550 ℃. Then, under the general tapping ambient temperature (1500-1550 ℃), this slag will either remain solid or only a small amount will become gas, and a large monomer will be retained in the bucket, which makes the slag particles easy to be eliminated due to the high floating speed, And the chance of mould defects will be greatly reduced if it is brought into the element.
