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Selection of silicon carbide and petroleum carburizing materials

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Selection of silicon carbide and petroleum carburizing materials

Date:2017-11-11 Author: Click:

In recent years, with the increasing requirements of the state on the atmospheric environment, it has become a consensus to strictly limit the emission of pollution from industrial enterprises. It has become a trend to change the melting of cast iron from cupola to induction furnace. With the wide spread of electric furnace smelting, there are two kinds of non-metallic materials - silicon carbide and carburizer, the application in cast iron smelting is also increasing. The superheating temperature of electric furnace smelting is obviously lower than that of cupola, and the metallurgical conditions are worse than that of cupola smelting, especially the tendency of white mouth and shrinkage are higher than that of cupola smelting. In order to improve the metallurgical quality of electric furnace smelting, reduce the heredity of pig iron and improve the mechanical properties of castings, the application of non-metallic silicon carbide and carburizer has become an inevitable trend, especially in the production of high-quality iron castings in electric furnace smelting.

At present, silicon carbide products on the domestic market are black and green, with different purity and price. Different enterprises can choose different silicon carbide products according to their own conditions and conditions. The microstructure and properties of cast iron largely depend on the microstructure and quality of raw materials. Due to the inheritance of graphite in pig iron, a large number of scrap and carburizer have to be used in electric furnace smelting. The use of carburizer is very important, especially for cylinder block and cylinder head castings which require high compactness, must use carburizer after high temperature graphitization. If there is no carburizing agent after high temperature graphitization, its impurity content is more, ash content is more, and it takes a longer time to diffuse to molten iron. If the melting time is short, the composition of molten iron in the furnace is not uniform, and the casting shrinkage defect is easy to be caused after pouring. In addition, the nitrogen content of the carburizer without high temperature treatment is higher. When the nitrogen content in molten iron increases to a certain level, crack-like porosity will be formed in the casting. 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.

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.

Petroleum carburizing agent

(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.

(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. Silicon carbide, as an inorganic nonmetallic material, has the characteristics of high temperature resistance and wear resistance.

Silicon carbide can also be added as an antioxidant in unfired bricks such as steel and aluminum magnesia carbon bricks.

Advanced refractory silicon carbide (i. e. silicon carbide). The chemical composition requirement of this brand is identical to that of abrasive silicon carbide. It is mainly used to manufacture advanced silicon carbide products, such as recrystallized silicon carbide products, gas turbine components, nozzles, silicon nitride bonded silicon carbide products, lining materials in high temperature zone of blast furnace, high temperature furnace components, high temperature kiln supporting parts, refractory casket bowls, etc. For higher grade content, the value of products produced will also be higher.

Silicon carbide refractory has many characteristics in practical application: high strength, high thermal conductivity, good seismic resistance, oxidation resistance, wear resistance, corrosion resistance and other excellent high-temperature properties, is a high-quality refractory. It has been widely applied in metallurgy, energy and chemical industry.


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