The complete production process of graphitized petroleum coke encompasses several stages, including raw material pretreatment, calcination, crushing and screening, batching and kneading, molding, baking, graphitization treatment, as well as fine processing and packaging. Here is a detailed introduction:
Raw Material Screening and Pretreatment: High-quality petroleum coke carbon materials are selected and subjected to screening and crushing processes to reduce them to an appropriate particle size. This step aims to remove impurities, ensuring the purity and uniform particle size of the raw materials, thereby laying a foundation for subsequent processes.
Calcination: The petroleum coke carbon materials of appropriate size are placed in a high-temperature furnace for calcination. This process eliminates moisture and volatile components from the raw materials, improving their physicochemical properties, such as true density and resistivity. Additionally, calcination contributes to the purification and upgrading of petroleum coke, enhancing its calorific value and physical properties.
Crushing and Screening: After calcination, the petroleum coke lumps need to be cooled to reduce their temperature. Subsequently, mechanical sorting is carried out to remove non-conforming products, ensuring product quality. Then, the cooled petroleum coke undergoes further crushing and screening to meet the particle size distribution requirements for subsequent processes.
Batching and Kneading: According to the product formulation requirements, the calcined petroleum coke is mixed with a binder (such as coal tar pitch) in a specific ratio. The mixture is then stirred at a specific temperature to ensure uniform blending and kneaded into a malleable paste. This step helps improve the compactness of the mixture, forming a homogeneous malleable paste that is conducive to molding.
Molding: The kneaded carbonaceous paste is subjected to plastic deformation under the external force applied by molding equipment, ultimately forming a green compact with a specific shape, size, density, and strength. During the molding process, factors such as mold type, equipment selection, and product quality control must be considered to ensure that the quality of the green compact meets the requirements.
Baking: The green compacts are placed in a specially designed heating furnace and subjected to high-temperature heat treatment under the protection of specific fillers. The baking process causes the coal tar pitch in the green compacts to carbonize, forming pitch coke that solidifies the carbonaceous aggregate and powder particles together. The baked carbon products exhibit high mechanical strength, low resistivity, and good thermal and chemical stability.
Graphitization Treatment: The baked petroleum coke lumps are placed in a graphitization furnace and subjected to graphitization treatment at high temperatures (typically 2800℃-3000℃). During this process, residual impurities in the petroleum coke lumps gradually volatilize, while carbon atoms rearrange to form a denser graphite structure. Graphitization treatment significantly enhances the electrical conductivity, thermal conductivity, and chemical stability of the carbon material, ultimately yielding high-purity graphitized petroleum coke.
Fine Processing and Packaging: After graphitization treatment, the petroleum coke undergoes fine processing (such as screening and grading) and packaging before being ready for sale. These products are widely used in the manufacture of various industrial products, including electrodes, cathodes, and boiler fuels.
Post time: Sep-08-2025