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Processing methods of carbon coke additive for petroleum coke

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Processing methods of carbon coke additive for petroleum coke

Date:2017-10-28 Author: Click:

Petroleum coke carbon increasing agent is made from petroleum coke calcined and purified, and its appearance is round or multi prism. Its characteristics are high carbon.

Low sulphur and low ash are ideal carbon-adding materials and reaction intermediates in metallurgical, chemical, mechanical and electrical industries, and are 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. Furnace input method:

The carburizing agent is suitable for smelting in induction furnace, but the specific use is different according to the technological requirements.

(1) The carburizer can be added to the lower and middle parts of the furnace according to the proportion or carbon equivalent requirement, and the recovery rate can reach more than 95%.

(2) If the carbon content of molten iron is insufficient to adjust the carbon content, the slag in the furnace is cleaned first, and then the carburizing agent is added. Carbon is dissolved and absorbed by heating up the molten iron, electromagnetic stirring or manual stirring. The recovery rate can be about 90. If the low temperature carburizing process is adopted, that is, the burden is only melted part, and the molten iron temperature is low. All the carburizers are added to the molten iron at one time, and the molten iron is pressed into the molten iron with the solid burden at the same time so as not to expose the surface of the molten iron. This method can increase carbon content by more than 1%. 1. effect of carburizing particle size

Carbon additive for petroleum coke

  




From the point of view of kinetics and thermodynamics, the oxidation of molten iron is related to the equilibrium temperature of C-Si-O system, that is, O in molten iron reacts with C and Si. However, the equilibrium temperature varies with the target C and Si content. When the molten iron is above the equilibrium temperature, carbon oxidation takes precedence. C and O form CO and C O2. In this way, the oxidation loss of carbon in molten iron increases. Therefore, above the equilibrium temperature, the absorbency of carburizing agent decreases; below the equilibrium temperature, the saturated solubility of carbon decreases, and the dissolution and diffusion rate of carbon decreases, resulting in a lower yield; at the equilibrium temperature, the absorbency of carburizing agent is the highest.

4. the influence of iron stirring on the absorbance of carburant

Mixing is conducive to the dissolution and diffusion of carbon, so that the carburizing agent will be burned on the surface of molten iron. The stirring time is long and the absorption rate is high before the carburizing agent is completely dissolved. Stirring can also reduce the carburizing and holding time, shorten the production cycle and avoid the burning loss of alloy elements in molten iron. However, too long stirring time not only has a great impact on the service life of the furnace, but also increases the carbon loss in molten iron after the carburizer dissolves. Therefore, suitable iron stirring time should be guaranteed to completely dissolve the carburizing agent.

5. the influence of chemical composition of iron liquid on the absorbance of carburant

When the initial carbon content in molten iron is high, the absorption rate of carburizer is slow, the absorption amount is small, the burning loss is relatively large, and the absorption rate of carburizer is low under a certain dissolution limit. When the initial carbon content of molten iron is low, the opposite is true. In addition, silicon and sulfur in molten iron hinder the absorption of carbon and reduce the absorption rate of carburant, while manganese contributes to the absorption of carbon and increases the absorption rate of carburant. As far as the extent of impact is concerned, silicon is the largest, followed by manganese, and carbon and sulfur are less affected. Therefore, the actual production process should increase manganese first, then increase carbon and then increase silicon. Petroleum coke is a by-product of refined crude oil. Residue oil and petroleum asphalt from crude oil 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 like, 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. This coke (1746, 12.00, 0.69%) has a needle-like structure which is easy to break. It is sometimes called graphite coke and is mainly used to make graphite electrode 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.


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