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Application area of petroleum carburizing agent

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Application area of petroleum carburizing agent

Date:2017-08-24 Author: Click:

Petroleum carburizer is mainly used to produce carbon products, such as graphite electrode, anode arc, to provide steel, non-ferrous metals, aluminum smelting; silicon carbide products, such as grinding wheels, peels, sandpaper; carbide products for the production of synthetic fibers, acetylene and other products; can also be used as fuel, but when used as fuel, it needs to be graded. Ultra-fine comminution is carried out by impact mill. The burning can be carried out only after the coke powder is made by JZC-1250 equipment. At present, some glass factories and coal water slurry factories mainly use coke powder as fuel.

The quality of petroleum coke depends largely on the properties and processing conditions of raw materials. The main quality indicators are:

purity

Refers to the content of sulfur and ash in petroleum coke. High sulfur coke can cause products to flatten during graphitization and cause cracks in carbon products. The high ash branch hinders the crystallization of the structure and affects the performance of the carbon products.

Crystallinity

The structure of coke and the size of mesophase spherules. Coke formed by small spheres, porous structure such as sponge, large spheres formed by coke, compact structure such as fiber or needle, its quality is better than sponge coke. In the quality index, the true density represents this property roughly. The true density is high, which means the crystallinity is good.

Thermal shock resistance

Fracture resistance of coke products to sudden rise to high temperature or rapid cooling from high temperature. The products of needle coke have good thermal shock resistance, so they are of high use value. The coefficient of thermal expansion represents this performance. The lower the thermal expansion coefficient, the better the thermal shock resistance.

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Granularity






The relative content of coke and lump coke (usable coke) contained in the coke is determined. Powder coke is mostly formed by mechanical action such as extrusion and friction in the process of coke removal and storage and transportation, so its quantity is also a kind of mechanical strength performance. Coke can be prevented from being broken by calcining mature coke. Coke with more granular coke and less powder coke has higher utilization value.






Petroleum coke quality standard SH/T0517-1992, Sinopec and January 1, 2011 introduced 4A and 4B indicators.






Elemental grade 1A 1B 2A 2B 3A 3B






Sulfur content is not greater than 0.5% 0.5% 0.8% 1% 1.5% 2% 3%






Volatiles are not greater than 12% 12% 14% 14% 17% 18% 20%






Ash is not greater than 0.3%, 0.3%, 0.5%, 0.5%, 0.5%, 0.8% 12%.






Moisture 3% 3% 3% 3% 3% 3% 3%






The true density is not greater than 2.08% 2.13% 2.13%.






Powdered coke 25%






Silicon content 0.08%






Vanadium content 0.15%






The development of 0.08% iron carburizer has a history of several decades. From the most common carbon powder, coal carburizer to the present high-quality graphitized carburizer, graphite electrode carburizer, it can be said that there have been earth-shaking changes, not only in the production process, but also in the use of results have been greatly improved. From the low price to the high price now reflects the renewal of materials and the change of material quality. Has been concerned about the development of the market as a whole carburizing agent changes. We must have a certain understanding only from the technology of carburizing agent. In fact, in actual production applications, the effect of carburizer on smelting and the use of the same chemical composition, which smelting process and the proportion of different ingredients are certain methods, such as: to obtain good carburizing effect, electric furnace is used in carburizing technology, cupola is used in high temperature smelting technology. The influence of carburizing agent on smelting is mainly in three aspects.




1. the technology of molten iron carburizing can increase graphite nucleation in smelting process, especially in electric furnace melting. Adding silicon carbide to cupola smelting can also increase the long-acting Graphite Nucleus of molten iron and reduce the oxidation of molten iron.




2. carbon enrichment is the best way to prevent or reduce the tendency of contraction. Due to the expansion of graphitization during solidification, good graphitization can reduce the shrinkage tendency of molten iron. 3. In order to obtain high strength grey cast iron castings with high carbon content, the process of adding carburizing agent to scrap steel is adopted in the smelting process, which makes the molten iron more pure and produces high performance castings. Smelting should use clean materials without oily dirt to avoid leakage or excessive scum. High quality carburant has high carbon content, low sulfur content, stable carbon effect and high carbon absorption rate. It can be used in various electric furnaces to smelt cast steel and cast iron, and bring considerable economic benefits to production. But do you know what kind of carburizing agent is good carburizing agent? The first is the appearance of carburizing agent, which requires cleanliness and impurity free. Secondly, the physical and chemical indexes of carburizing agent should conform to the following table:




project




index




Superior grade




Class A




second level




Water (mass fraction) /% less than




Zero point two




Zero point three




Zero point eight




Volatile (dry basis) (mass fraction) /% less than




Zero point six




One




One point two




Ash (dry basis) (mass fraction) /% less than




Zero point four




One




One point eight




State Economic and Trade Commission 2001-07-09 2002 -01-01 implementation






project




index




Superior grade




Class A




second level




Sulfur content (dry basis) (mass fraction) /% less than




Zero point four




Zero point five




Zero point six




Fixed carbon (dry basis) (mass fraction) /% equal to




Ninety-nine




Ninety-eight




Ninety-seven




granularity




0-1mm




The natural particle size distribution is larger than 1mm.




0-5mm 0-10mm




The natural size distribution is 5mm or 10 mm larger than 10%.




1mm-4mm 4-10mm




Particle size (mass fraction) not less than 90%




Note: particle size and particle size index can also be processed according to user requirements.


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