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Effect of carburizing agent 1. on the size of carburizing agent for petroleum coke
The carburizing process using carburizing agent includes dissolution and diffusion process and oxidation loss process. The size of the carburizing agent is different, and the rate of dissolution and diffusion and the rate of oxidation loss are different. The absorption rate of the carburizer depends on the comprehensive effect of the dissolution and diffusion rate of the carburizer and the oxidation loss rate: in general, the carburizer particles are small, the dissolution rate is fast, and the loss rate is large; the carburizer particles are large, the dissolution rate is slow, and the loss rate is small. The size of the carburizing agent is related to the diameter and capacity of the furnace. In general, the diameter and capacity of the furnace is large, the particle size of the carburizer is larger; conversely, the particle size of the carburizer is smaller. The granularity of crystalline graphite is required to be 0.5-2.5 mm for electric furnace melting below 1 t, 2.5-5 mm for crystalline graphite for 1t-3 t, 5.0-20 mm for crystalline graphite for 3t-10 T and 0.5-1 mm for crystalline graphite for coating in ladle.
2. the influence of adding amount of carburizing agent.
Under certain conditions of temperature and chemical composition, the saturation concentration of carbon in molten iron is certain. The dissolution limit of carbon in cast iron is ([C%]=1.3+0.0257T-0.31 [Si%]-0.33 [P%]-0.45 [S%]+0.028 [Mn%] (T is molten iron temperature). At a certain saturation, the more the carburizer is added, the longer the dissolution and diffusion time is required, the greater the corresponding loss, and the lower the absorption rate.
3. effect of temperature on absorbance of carburant
From the point of view of kinetics and thermodynamics, the oxidation of molten iron is related to the equilibrium temperature of C-Si-O system, that is, O in molten iron reacts with C and Si. However, the equilibrium temperature varies with the target C and Si content. When the molten iron is above the equilibrium temperature, carbon oxidation takes precedence. C and O form CO and C O2. In this way, the oxidation loss of carbon in molten iron increases. Therefore, above the equilibrium temperature, the absorbency of carburizing agent decreases; below the equilibrium temperature, the saturated solubility of carbon decreases, and the dissolution and diffusion rate of carbon decreases, resulting in a lower yield; at the equilibrium temperature, the absorbency of carburizing agent is the highest.
4. the influence of iron stirring on the absorbance of carburant
Mixing is conducive to the dissolution and diffusion of carbon, so that the carburizing agent will be burned on the surface of molten iron. The stirring time is long and the absorption rate is high before the carburizing agent is completely dissolved. Stirring can also reduce the carburizing and holding time, shorten the production cycle and avoid the burning loss of alloy elements in molten iron. However, too long stirring time not only has a great impact on the service life of the furnace, but also increases the carbon loss in molten iron after the carburizer dissolves. Therefore, suitable iron stirring time should be guaranteed to completely dissolve the carburizing agent.
5. the influence of chemical composition of iron liquid on the absorbance of carburant
When the initial carbon content in molten iron is high, the absorption rate of petroleum coke carburizer is slow, the absorption amount is small, the burning loss is relatively large, and the absorption rate of carburizer is low under a certain dissolution limit. When the initial carbon content of molten iron is low, the opposite is true. In addition, silicon and sulfur in molten iron hinder the absorption of carbon and reduce the absorption rate of carburant, while manganese contributes to the absorption of carbon and increases the absorption rate of carburant. As far as the extent of impact is concerned, silicon is the largest, followed by manganese, and carbon and sulfur are less affected. Therefore, the actual production process should increase manganese first, then increase carbon and then increase silicon.
1. The same chemical composition and particle size distribution of carburizing agents is the same as carburizing agent.
Reasons: Different crystal structures and external morphologies determine different diffusion rates and nucleation abilities, thus affecting production efficiency and metallurgical properties. Different Carburants can not be compared by chemical composition and particle size.
Two. Carburizing agents are equivalent to carburizing substances.
Carburizer can greatly affect the quality of castings by influencing the quantity and morphology of graphite. The value of carburizer can not be completely compared by the price per unit of carburization when the quality of castings is high.
Three. The use of carburizing agent leads to the large white chilling tendency of the molten iron and the bad graphite shape.
Carburizer is mainly used to improve the quality of castings and increase the quality of products. Proper use can eliminate or reduce the tendency of whiteness and shrinkage porosity of thin-walled castings.
Selection of high quality carburizer is the premise. In addition, the stability of castings can be improved under the condition of proper usage method, usage and other processes, thus reducing the production cost and improving the quality of products.
The morphology of petroleum coke varies with process, operation conditions and feedstock properties. Petroleum coke produced from the petroleum coke plant is called green cokes. It contains the volatiles of some uncarbonated hydrocarbons. The coke can be used as fuel grade petroleum coke. If the anode for aluminum making or the electrode for steel making is to be used, it needs to be calcined at high temperature to complete carbonization and reduce the volatile matter to a minimum. Most of the coke produced in petroleum coke factories has a dark brown porous solid irregular block appearance, which is also called sponge coke. The second better quality petroleum coke, called needle coke, is better suited for electrodes because of its low resistance and thermal expansion coefficient. The third hard petroleum coke is called a shotcoke, which is shaped like a projectile and has a small surface area and is not easy to coke, so it is of little use.