Factory direct sale high quality Artificial Graphite for foundry and steel mill
Factory direct sale high quality Artificial Graphite for foundry and steel mill,Expandable Artificial Graphite/Graphite Petroleum Coke/Calcined Petroleum Coke
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In a broad sense, all graphite materials obtained through organic carbonization and graphitization at high temperature can be called artificial graphite, such as carbon fiber, pyrolysis carbon, foam graphite, etc. In the narrow sense, artificial graphite usually refers to the bulk solid materials, such as graphite electrode and isostatic pressure graphite, produced by the processes of batching, mixing, molding, carbonization and graphitization, with low impurity content of carbonaceous raw materials as aggregates and coal tar pitch as binder. In metallurgical industry, natural flake graphite can be used to produce refractory materials such as magnesia carbon brick and aluminum carbon brick because of its good oxidation resistance.
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Artificial graphite can be used as an electrode for steelmaking, while the electrode made of natural graphite is difficult to be used in steelmaking furnaces with harsh conditions. In the mechanical industry, graphite is usually used as a wear-resisting and lubricating material. Natural flake graphite has good lubricity and is often used as lubricant additive. The equipment for conveying corrosive medium widely adopts piston ring, sealing ring and bearing made of artificial graphite, without adding lubricating oil when working. Natural graphite and polymer resin composites can also be used in the above fields, but the wear resistance is not as good as artificial graphite.
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In the chemical industry, artificial graphite is characterized by corrosion resistance, good thermal conductivity and low permeability. In the chemical industry is widely used in the production of heat exchangers, reaction tanks, absorbers, filters and other equipment. Natural graphite and polymer resin composites can also be used in the above fields, but the thermal conductivity, corrosion resistance is not as good as artificial graphite.
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Natural graphite: crystal development is relatively complete, the degree of graphitization of flake graphite is more than 98%, and the degree of graphitization of natural microcrystalline graphite is usually less than 93%. Artificial graphite: crystal development depends on raw material and heat treatment temperature. Generally speaking, the higher the heat treatment temperature, the higher the degree of graphitization. At present, the degree of graphitization of artificial graphite produced by industry is usually less than 90%.
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Natural flake graphite: it is a kind of single crystal, with simple structure and structure. It only has crystallographic defects (such as point defects, dislocation, stratification dislocation, etc.), and macroscopically shows the characteristics of anisotropy. The grain size of natural microcrystalline inks is small, the grains are arranged in disorder and there are holes after removing impurities. Macroscopically, they show isotropy.
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Artificial graphite can be regarded as a kind of multiphase material, including the graphite phase transformed by carbonaceous particles such as petroleum coke or asphalt coke, the graphite phase transformed by coal asphalt binder coated around the particles, the pores formed by particle accumulation or coal asphalt binder after heat treatment, etc. Natural graphite usually exists in powder form and can be used alone, but it is usually used in combination with other materials. Artificial graphite: there are many forms, both powdery, fibrous and blocky, and the narrow sense of artificial graphite is usually blocky, need to be processed into a certain shape.
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In terms of physical and chemical properties, natural graphite and artificial graphite have both similarities and differences in properties. For example, both natural graphite and artificial graphite are good conductors of heat and electricity, but for graphite powders with the same purity and particle size, natural flake graphite has the best heat transfer performance and conductivity, followed by natural microcrystalline graphite, and artificial graphite has the lowest. Graphite has better lubricity and certain plasticity, the crystal development of natural flake graphite is more perfect, the friction coefficient is small, the lubrication is the best, the highest plasticity, and dense crystalline graphite and cryptocrystalline graphite followed by artificial graphite is poor.
Expandable Artificial Graphite/Graphite Petroleum Coke/Calcined Petroleum Coke
Mainly petroleum coke, needle coke as raw material, coal pitch as binder, calcination, ingredients, kneading, molding, baking and graphitization, machining and made, which is released in electric arc furnace in the form of arc conductor of electricity to heat melting furnace charge, according to its quality indicators, can be divided into ordinary power, high power and high power. Graphite electrode includes: ordinary power graphite electrode. Graphite electrode with current density less than 17A/ cm 2 is allowed, which is mainly used in common power electric furnace for steel making, silicon refining, yellow phosphorus refining and so on. Oxide coated graphite electrode. The graphite electrode coated with a layer of anti-oxidation protective layer can form a protective layer that can conduct electricity and withstand high temperature oxidation, so as to reduce the electrode consumption in steelmaking.
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