The main functions of silicon calcium manganese are deoxidizers, warming agents and inoculants, etc. Silicon calcium manganese is used for deoxidation and warming in the steelmaking industry. Silicon and calcium in silicon calcium manganese composite deoxidation have a great affinity for oxygen. Calcium has a high affinity for sulfur It is also very large, and the deoxidation and desulfurization products are easy to float and remove, which improves the performance of the steel, and improves the toughness and impact of the steel. Manganese can increase the manganese content in the molten steel and reduce the amount of silicon-manganese alloy. Therefore, silicon calcium manganese composite deoxidizer is an ideal composite deoxidizer with both deoxidation and manganese enhancement in the steelmaking industry. Deoxidation of molten steel is an important part of steelmaking production. Conventional AL-containing deoxidizers include metal aluminum, silicon-aluminum-iron, silicon-aluminum-barium, etc., and their prices are generally high. When AL deoxidizer is used for deoxidation, the deoxidized product generally contains AL2O3 In order to overcome the shortcomings of AL deoxidation and reduce the cost of deoxidizers, silicon calcium manganese composite deoxidizers can be used in smelting processes such as electric furnaces—LF furnaces and converters.