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Feedstock for petroleum coke carbon increasing agent

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Feedstock for petroleum coke carbon increasing agent

Date:2018-03-10 Author: Click:

Petroleum coke carburizer is a by-product of refined crude oil. Residue oil and petroleum asphalt obtained from crude oil by constant pressure distillation or vacuum distillation can be used as raw materials for making petroleum coke. After coking, raw petroleum coke can be obtained. The output of raw petroleum coke is less than 5% of the crude oil used. The annual output of raw petroleum coke in the United States is about 30 million T. The content of impurities in raw petroleum coke is high and can not be directly used as carburizing agent.


Raw petroleum coke is spongy, needle shaped, granular and flowing.


Sponge petroleum coke is produced by delayed coking. Because of its high sulfur and metal content, it is usually used as fuel for calcination and as raw material for calcination of petroleum coke. Calcined sponge coke is mainly used in the aluminum industry and as a carburizing agent.


The acicular petroleum coke is produced by delayed coking from the raw material with high aromatic hydrocarbon content and low impurity content. The coke has a needle-like structure, sometimes called graphite coke, which is easy to crack. It is mainly used to make graphite electrodes after calcination.


Granular petroleum coke is hard granular, which is made from high sulfur and asphaltene content raw materials by delayed coking method, mainly used as fuel.


Fluidized petroleum coke is produced by continuous coking in a fluidized bed. It is fine granular, has no directional structure, high sulfur content and low volatile matter.


The calcination of petroleum coke is to remove sulfur, water and volatile matter. Calcined raw petroleum coke at 1200~1350 degree can make it become basically pure carbon.


The largest user of calcined petroleum coke is the aluminum industry, and the 70% is used to produce anodes for the reduction of bauxite. Calcined petroleum coke produced by American petroleum coke is about 6% of the cast iron carburizing agent. Petroleum coke carbon addition agent can be added in iron liquid. However, the added amount should not exceed 0.2% at the later stage to avoid graphite bulky. The choice of carburizing agents must be of good quality and low nitrogen content. If iron contains Ti, it is low.

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It is impossible to neutralize a large amount of nitrogen. At this time, a large number of pores will be produced due to N2's uncleanup. Good carburizing agent containing graphite and carbon.


In 95%~98%, the content of S is below 0.5%. N content in 500~4000ppm is a carburizing agent with poor quality. In a word, silicon carbide and carburizer are two kinds of non-metallic materials used in cast iron, which have their advantages and disadvantages. It is necessary to select carefully and use reasonably to achieve the desired effect. The petroleum coke carburizer is processed by calcining and purifying petroleum coke, and the appearance 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. Petroleum coke carburizer is made from calcined petroleum coke. As a good carbon additive and intermediate reactor, it is used in metallurgy, chemistry, machinery, electric power and other industries. It can be applied to the steel industry.


1. effect of carburizing particle size


The carburizing process of graphitized petroleum coke carbon additive includes dissolution 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. Petroleum coke carburant requires 0.5-2.5 mm for crystalline graphite in electric furnace melting below 1t; 2.5-5 mm for crystalline graphite in 1t-3 t electric furnace melting; 5.0-20 mm for crystalline graphite in 3t-10 t electric furnace melting; and 0.5-1 mm for crystalline graphite in casting ladle.


2. the influence of adding amount of carburizing agent.


Carbon additive for petroleum coke


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. First of all, graphite fossil oil coke is the best carbon carburizing agent for smelting. In the steel making industry, we must produce good steel.


There must be good raw materials, including good carburizing agents, and graphitized petroleum coke is the best carburizing agent.



When there is no graphite fossil oil coke, the graphite electrode has less leftover material and higher price.


Increasing the cost of steelmaking and restricting the development of the iron and steel industry, the emergence of graphitized commercial street, to break this.


As a bottleneck, China's steel industry is developing rapidly, and the output of iron and steel is the number one in the world.



In the past, in the domestic smelting industry, the relatively low end non graphitized carburizing agent was generally used as the product quality.



With the need of upgrading and upgrading, graphitization Coke will be used more and more in China. Conservative calculation of steel smelting



0.05% the ratio of graphitization to coke is estimated to be 350 thousand tons per year.



In recent years, the demand for energy saving and emission reduction is getting higher and higher.


The performance requirements of industrial burden in supporting services are also increasing, making large cathode blocks and graphitization.


Electrode and electrode paste should be added with more excellent graphite crumbs. Graphite fossil oil coke can be replaced without cost.


Substitute graphite for crushing, and the market demand increases year by year, the amount of graphite broken is small, the cost is high, and the price is high. New town


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