In the process of calcining coke, the structure and element composition of various carbonaceous raw materials undergo a series of profound changes, thereby improving their physical and chemical properties. The calcining quality of petroleum coke has a great influence on the quality of the finished carbon material and the technical indicators of each process. Therefore, ensuring the calcining quality of raw materials is an important prerequisite for ensuring the quality of the final product. High temperature asphalt
The porosity of the recarburizer also plays a vital role in the recarburization effect and the absorption rate of the recarburizer. Through the production process, all the pores of the petroleum coke recarburizer are opened, so that the specific surface area of the recarburizer is increased, and the product has Super permeability, it can be quickly dissolved in molten steel, so that the absorption rate is increased, and the carbon is increased efficiently. Graphitized petroleum coke is to place petroleum coke in a graphitization furnace. After a high temperature of about 3,000 degrees, the amorphous chaotic layer structure carbon crystals of the petroleum coke are transformed into hexagonal layer structure crystalline carbon, that is, the petroleum coke becomes graphite. This process is called graphitization, and the petroleum coke processed through the graphitization process is called graphitized petroleum coke, commonly known as "graphitized coke".
The recarburizer is suitable for smelting in an induction furnace, but the specific use varies according to the process requirements.
(1) The recarburizer used in the smelting of the intermediate frequency electric furnace can be added to the middle and lower parts of the electric furnace according to the proportion or carbon equivalent requirements, and the recovery rate can reach more than 95%;
(2) If the amount of carbon is not enough to adjust the carbon content, first clean the slag in the furnace, then add a recarburizer, heat up the molten iron, electromagnetic stirring or manual stirring to dissolve and absorb the carbon, and the recovery rate can be about 90%. Low-temperature recarburization process is adopted, that is, only part of the charge is melted. When the molten iron temperature is low, all the recarburizers are added to the molten iron at one time, and at the same time, the solid charge is used to press it into the molten iron to prevent it from exposing the iron. Liquid surface. This method can increase the carbon content of molten iron by more than 1.0%.
The recarburizer is used in casting, which can greatly increase the amount of scrap steel, reduce the amount of pig iron or eliminate the need for pig iron. In the feeding method of electric furnace smelting, the recarburizer should be put in with the scrap steel and other charge, and small doses can be added to the surface of the molten iron. However, it is necessary to avoid large batches of materials into the molten iron to prevent excessive oxidation and the occurrence of insignificant recarburization effects and insufficient carbon content of the castings. The amount of recarburizer added is determined according to the ratio of other raw materials and the carbon content. For different types of cast iron, choose different types of recarburizers according to your needs. The characteristics of the recarburizer itself choose pure carbon-containing graphitized substances to reduce excessive impurities in the pig iron, and the appropriate selection of the recarburizer can reduce the production cost of castings.