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Processing method of carbon coke for carbon coke in Panjin

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Processing method of carbon coke for carbon coke in Panjin

Date:2017-12-09 Author: Click:

Panjin Carbon Petroleum Coke Carburizing Agent Petroleum Coke Carburizing Agent is processed by calcining and purifying petroleum coke. The appearance of Panjin Carbon Petroleum Coke Carburizing Agent is round or polygonal. It is characterized by high carbon, low sulfur and low ash. It is an ideal carbon-adding material and reaction intermediate in metallurgical, chemical, mechanical and electric industries, and has been widely used.


Petroleum coke carbon increasing agent is made from petroleum coke calcined and purified, and its appearance is round or multi prism. It is characterized by high carbon, low sulfur and low ash. It is an ideal carbon-adding material and reaction intermediate in metallurgical, chemical, mechanical and electric industries, and has been widely used.


The main uses of petroleum coke are pre-baked anodes and pastes for aluminum electrolysis, carbon industry to produce carbon additives, graphite electrodes, smelting industrial silicon and fuels.


According to the structure and appearance of petroleum coke, petroleum coke products can be divided into acicular coke, sponge coke, projectile coke and powder coke.


(1) Needle coke, with obvious needle-like structure and fiber texture, is mainly used as high-power and ultra-high-power graphite electrode in steelmaking. Because needle coke has strict quality requirements in sulfur content, ash, volatile and true density, it has special requirements for needle coke production process and raw materials.


(2) sponge coke has high chemical reactivity and low impurity content. It is mainly used in the aluminum smelting industry and the carbon industry.


(3) Projectile coke or spherical coke: spherical shape, diameter 0.6-30mm, generally produced by high sulfur, high asphaltene residue, can only be used as power generation, cement and other industrial fuels.

Panjin carbon

  

(4) Powdered coke: It is produced by fluidized bed coking process with fine particles (0.1-0.4 mm in diameter), high volatile matter and high coefficient of thermal expansion. It can not be directly used in electrode preparation and carbon industry.


According to the different sulfur content, it can be divided into high sulfur coke (more than 3% sulfur content) and low sulfur coke (less than 3% sulfur content). Low sulphur coke can be used as anode paste and prebaked anode for aluminum plant and graphite electrode for steel plant. High quality low sulfur coke (sulfur content less than 0.5%) can be used to produce graphite electrodes and carbon additives. Low sulfur coke (sulfur content less than 1.5%) of common quality is commonly used to produce prebaked anode. Low quality petroleum coke is mainly used for smelting industrial silicon and producing anode paste. High sulfur coke is generally used as fuel for cement plants and power plants. In the smelting process, due to improper burden or charging and excessive decarbonization and other reasons, sometimes the carbon content in steel does not meet the requirements of the top period, at this time to increase carbon in the molten steel. Commonly used carburizing agents include carburizing pig iron, electrode powder, petroleum coke powder, charcoal powder and coke powder. When converter is used to smelt medium and high carbon steel, Jiaozuo is used as carburizing agent with very little oil. High fixed carbon, low content of ash, volatile matter and impurities such as sulfur, phosphorus and nitrogen, dry, clean and moderate particle size are required for carburizer used in top-blown converter steelmaking. 1. effect of carburizing particle size


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 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.


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