Calsium Silicon granules are used as deoxidizer in steelmaking, and their main elements are ca (24-31%) and si (55-65%). Silica and calcium oxide are reduced by carbonaceous reducing agent in smelting furnace, and the raw materials are silica, lime, coke, charcoal and coal. The main production methods are mixing method, stratified feeding method and silicothermal method.
The main components of steelmaking Calsium Silicon granules are silicon and calcium, silicon is an important alloying element, it can improve the hardness and strength of steel, but also can improve the wear resistance and corrosion resistance of steel. Calcium is an important desulfurizer, which can react with sulfide in steel to produce volatile calcium sulfide, thus reducing sulfur content of molten steel and improving the purity and quality of molten steel.
(1)The preparation process of Calsium Silicon granules in steelmaking is complicated, which needs to be prepared by high temperature melting method. First, a variety of elements such as silicon, calcium, iron, and aluminum are mixed in a certain proportion, and then the mixture is melted in a high-temperature furnace, and finally the melt is cooled into particles.
(2) The existing Calsium Silicon granules used as deoxidizers in steelmaking are mainly composed of Ca (24-31%) and Si (55-65%). They are prepared by reducing silica and calcium oxide with a carbon reducing agent in a submerged arc furnace. The raw materials for production are silica, lime, coke, charcoal, and bituminous coal. The production methods mainly include mixing, layered feeding, and silicothermic methods. Taking the layered feeding method as an example, the basic process is as follows: first, after the furnace is discharged, the collapsed material area is rammed down, new material is added, the furnace is rammed for ventilation, and the temperature is raised by simmering (about 1-2 hours); Secondly, mix lime and coke evenly and simmer around the electrode; Finally, after the lime is melted, new materials are added, and after half an hour of simmering, silica is added to destroy CaC2, resulting in the formation of silica calcium particles and being discharged from the furnace.
