The treatment method of silicon-calcium alloy includes preparation, batching, smelting and baking process. Its characteristics are that the raw materials include limestone, quartz, fluorite, soda and coke powder. In addition to magnesium and rare earth metals, calcium can also reduce the oxygen content and sulfur content that hinder the formation of pellet fossil ink, and promote the spheroidization of graphite in the casting. Calcium is widely used as a denaturing agent in steelmaking and alloys. Treating metal melts with pure calcium or its alloys can improve the physical and chemical properties of the metal, which is conducive to improving the morphology of oxide and sulfide inclusions in finished steel and castings.
Si-ca alloy si-Ca alloy is made of silica, lime and coke as raw materials and obtained in a strong reduction atmosphere of 1500-1800 degrees. Its main components are silicon and calcium, and it also contains impurities such as iron, aluminum, carbon, sulfur and phosphorus in varying amounts. Used in iron and steel industry as calcium additive, deoxidizer, desulfurizer and denaturant of non-metallic inclusions. The cast iron industry uses as inoculant and denaturant. The exothermic effect of si - ca addition to molten steel is strong. Calcium turns into calcium vapor in liquid steel, which has stirring effect on liquid steel and is beneficial to the floating of nonmetallic inclusions. After deoxidation, non-metallic inclusions with larger particles and easy to float will be produced, and the shape and properties of non-metallic inclusions will also be changed. Therefore, si-Ca alloy is used to produce clean steel, steel with low oxygen and sulfur content, and special steel with extremely low oxygen and sulfur content. In the production of cast iron, si-Ca alloy not only plays a role of deoxidation and purification, but also plays a role of inoculation, which contributes to the formation of fine or spherical graphite. The graphite distribution in grey cast iron is uniform and the tendency of whiteness is reduced. And can increase silicon, desulfurization, improve the quality of cast iron.
