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Reasons for the low absorption rate of carbon raiser
Views: 467 Update date: May 14,2021

The main function of carbon raiser is to increase recarburization. It is widely used in steelmaking and casting. In the process of actual use of carbon raiser, increasing its absorption rate can achieve the purpose of saving costs and improving the efficiency of manufacturers, so the impact on production is analyzed. The reason for the absorption rate of carbon raiser is a thing worth analyzing!


From the perspective of kinetics and thermodynamics, the oxidation of molten iron is related to the equilibrium temperature of the C-Si-O system, that is, O, C, and Si in the molten iron will respond to iron alloys, and the equilibrium temperature varies with the target C and Si content Different and different, when the iron liquid is above the equilibrium temperature, carbon oxidation occurs first, and C and O generate CO and CO2, so that the carbon oxidation loss in the liquid iron increases, so when the iron liquid is above the equilibrium temperature, the carburizer absorption rate decreases when the recarburization temperature is below the equilibrium temperature, because the temperature is lower, the saturated solubility of carbon decreases, and the dissolution and diffusion rate of carbon decreases, so the yield is also low. When the recarburization temperature is at the equilibrium temperature, the carbon raiser absorbs the highest rate.


Stirring is conducive to the dissolution and diffusion of carbon, and prevents the carbon raiser from floating on the surface of the molten iron and being burned. Before the carbon raiser is completely dissolved, the stirring time is long and the absorption rate is high. The cycle is shortened to avoid the burning of alloy elements in the molten iron, but the stirring time is too long, which not only has a greater impact on the selection life of the furnace, but also after the carbon raiser is dissolved, the stirring will aggravate the loss of carbon in the molten iron, so it is suitable the stirring time of the molten iron should be suitable to ensure that the carbon raiser is completely dissolved.



When the initial carbon content in the molten iron is high, the absorption speed of the carbon raiser is slow, the absorption amount is small, and the burning loss is relatively large under a certain solubility limit, and the absorption rate of the carbon raiser is low. When it is low, the situation is the opposite. In addition, the silicon and sulfur in the molten iron hinder the absorption of carbon and reduce the absorption rate of the carbon raiser; while the manganese element contributes to the absorption of carbon, updating the iterative carbon raiser absorption rate, in terms of the degree of influence, silicon is the largest, followed by manganese, and carbon and sulfur have less impact. Therefore, in the actual production process, manganese should be added first, then carbon, and then silicon.


It can be seen from the above that the reasons affecting the absorption rate of the carbon raiser can be attributed to the temperature, molten iron agitation, and the chemical composition of the molten iron. Therefore, in the actual use of the carbon raiser, these three aspects can be better controlled. The absorption rate of the agent is greatly improved.

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