Main factors affecting the absorptivity of tar carburizer

The operation process of using calcined coke carburizer includes dissolution diffusion and oxidation loss. When the particle size of carburizing agent is different, the dissolution diffusion rate and oxidation loss rate are also different. The absorption coefficient of carburetor depends on the comprehensive effect of dissolution diffusion speed and oxidation loss rate of carburetor: generally, the particle size of carburetor is small, the dissolution speed is fast, and the loss rate is large; the particle size of carburetor is large, the dissolution speed is slow, and the loss rate is small. The choice of particle size of carbonizing agent is related to furnace diameter and capacity. In general, the larger the diameter and capacity of the furnace, the larger the particle size of carburizing agent; on the contrary, the smaller the particle size of carburizing agent. The grain size standard of crystalline graphite melted in electric furnace of less than 1 ton is 0.5-2.5 mm; the grain size standard of crystalline graphite melted in electric furnace of 1 ton-3 ton is 2.5-5 mm; the grain size standard of crystalline graphite melted in electric furnace of 3 ton-10 ton is 5.0-20 mm; ~ 1 mm. Price of carburizer

What? Most of the carburizers you choose now are graphitizing carburizers? Because the flake arrangement of carbon atoms can become a better core in the graphite core to promote graphitizing, and the high temperature graphitizing carburizers change the original disordered arrangement of carbon atoms into flake arrangement. At the same time, in the process of high temperature graphitization, the sulfur content in sulfur dioxide gas escapes and decreases. Therefore, the sulfur content of high-quality graphitized carburizer is generally low, generally less than 0.2%, even less than 0.05%. It is also an indirect index to judge whether high temperature graphitization is good or not. If the carburizer does not graphitize at high temperature, the nucleation ability of graphite will be greatly reduced and the graphitization function will be weakened. Even at the same carbon content, the results are completely different. Tar carburizer

In the charging mode of electric furnace melting, carburizing agent and scrap should be put into the furnace together. Small amount of additives can be added to the surface of molten iron. However, it is necessary to avoid the large-scale feeding of molten iron and excessive oxidation, resulting in the lack of carbon content in castings. The amount of carburizer depends on the ratio of other raw materials to carbon content. For different types of cast iron, different types of petroleum coke carburizing agents are selected according to the needs. The characteristic of carburizing agent itself is to select pure graphite containing carbon to reduce excessive impurities in pig iron. The production cost of castings can be reduced by selecting suitable carburizing agent.

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