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Which coke is suitable for electrode making?
Views: 416 Update date: Feb 09,2022

Carbon material production process is a tightly controlled system engineering, production of graphite electrode, special carbon materials, aluminum carbon, new high-end carbon materials are inseparable from the use of raw materials, equipment, technology, management of four production factors and related proprietary technology.


Raw materials are the key factors that determine the basic characteristics of carbon materials, and the performance of raw materials determines the performance of manufactured carbon materials. For the production of UHP and HP graphite electrodes, high quality needle coke is the first choice, but also high quality binder asphalt, impregnating agent asphalt. But only high quality raw materials, the lack of equipment, technology, management factors and related proprietary technology, is also unable to produce high quality UHP, HP graphite electrode.


Although the industrial production of needle coke in China is later than that of foreign enterprises, it has developed rapidly in recent years and has begun to take shape. In terms of total production volume, it can basically meet the demand of needle coke for UHP and HP graphite electrodes produced by domestic carbon enterprises. However, there is still a certain gap in the quality of needle coke compared with foreign enterprises. The fluctuation of batch performance affects the demand for high-quality needle coke in the production of large size UHP and HP graphite electrode, especially there is no high-quality joint needle coke that can meet the production of graphite electrode joint.


Foreign carbon enterprises producing large specifications UHP, HP graphite electrode is often the first choice of high-quality petroleum needle coke as the main raw material coke, Japanese carbon enterprises also use some coal series needle coke as raw material, but only for the following φ 600 mm specification of graphite electrode production. At present, the needle coke in China is mainly coal series needle coke.


At present, the needle coke produced by various enterprises is usually compared with the commercial performance indexes of foreign needle coke by conventional performance indexes, such as ash content, true density, sulfur content, nitrogen content, particle size distribution, thermal expansion coefficient and so on. However, there is still a lack of different grades of needle coke classification compared with foreign countries. 


In addition to conventional performance comparison, carbon enterprises should also pay attention to the characterization of needle coke, such as the classification of thermal expansion coefficient (CTE), particle strength, anisotropy degree, expansion data in non-inhibited state and inhibited state, and temperature range between expansion and contraction. Because these thermal properties of needle coke is very important to the control of graphitization process in the production process of graphite electrode, of course, the influence of the thermal properties of asphalt coke formed after roasting of binder and impregnating agent asphalt is not excluded.

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