Which is better to choose recarburizer for steelmaking?

In the entire process of the smelter, due to poor seasoning or discharging and excessive carburization, sometimes the carbon content of the steel does not meet the requirements of the top period. At this time, it is necessary to increase the carbon in the desolubilization. Common recarburizers include recarburizing cast iron, electrical grade powder, petroleum coke powder, charcoal powder and coke powder. In steelmaking furnaces and smelting plants of medium and medium carbon steel, petroleum coke with very little residue is used as a recarburizer. The requirements for the recarburizer for top-blowing steelmaking furnaces are high immobilized carbon, low ash, volatile content, sulfur, phosphorus, and nitrogen residues, and are dry, tidy, and have a moderate particle size distribution.

There are many kinds of raw materials for recarburizers, and the production process is also different. There are wooden carbon, raw coal carbon, coke, high-purity graphite, etc., and there are many under various categories. Small type. Recarburizers generally refer to recarburizers that have undergone graphitization. Under high temperature standards, the order of oxygen atoms is the external economic shape of high-purity graphite, so it is called graphitization. Graphitization can reduce the residual components in the recarburizer, the carbon content of the recarburizer, and reduce the sulfur content. The recarburizer is applied during forging, which can greatly reduce the amount of used steel and reduce the amount of cast iron or eliminate the need for cast iron.

Graphite powder is used as a recarburizer, and the blowing rate is 40kg/t, which is estimated to increase the carbon content of the molten iron from 2% to 3%. As the carbon content of the molten iron slowly rises, the carbon usage rate decreases. The temperature of the molten iron before recarburization is 1600°C, and the average value after recarburization is 1299°C. Injecting graphite powder to increase carbon, generally chooses N2 as the medium, but under the industrial production standard, it is more convenient to use air compression, and the oxygen in the air compression causes CO. The chemical change heat can compensate for a part of the temperature drop, and the CO recovery atmosphere is Conducive to improving the actual effect of carbon increase.