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Vol 263
Pages:
795-809
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RUS ENG
Research article
Geotechnical Engineering and Engineering Geology

Scientific and technical substantiation of the possibility for the organization of needle coke production in Russia

Authors:
Vyacheslav А. Rudko1
Renat R. Gabdulkhakov2
Igor N. Pyagai3
About authors
Date submitted:
2023-05-17
Date accepted:
2023-08-17
Date published:
2023-10-27

Abstract

Russia is one of the world's leading steel producers, while about 33 % of production comes from the scrap remelted in arc steelmaking furnaces. The graphitized electrodes of SHP and UHP grades, mainly consisting of needle coke, are used for high current loads and temperatures in furnaces. USA, Japan, Korea, and China are focused on needle coke production, where coal (tar and pitch) and petroleum (decantoil), by-products of metallurgical factories and oil refineries, are used as raw materials. Russia's annual demand for needle coke is approximately 100 thousand tons, but all of it is covered by imports. Russia's raw material potential, established by the authors of the article, is more than 5 million tons per year and includes decantoil, coal tar and pitch, and heavy pyrolysis tar. The results of obtaining needle coke from decantoil and heavy pyrolysis tar are given below. The prototypes of needle coke were produced on specially designed delayed coking laboratory units (loading up to 0.25 and 80 kg). Raw materials were modified according to the original technology of Saint Petersburg Mining University, the convergence of target properties of which is confirmed by the results of quality analysis of the obtained needle coke, including after 100-fold scaling. The electrodes were molded from the obtained coke. After standardized stages of firing, mechanical processing and graphitization at 2,800-3,000 °C, the coefficient of linear thermal expansion was less than 1 × 10 –6 К –1 , and the value of specific electrical resistance was 7.1-7.4 μOhm, which proves that the obtained carbon material corresponds in quality to Japanese analogues and Super Premium needle coke.

Keywords:
needle coke graphitized electrodes delayed coking unit decantoil heavy pyrolysis tar petroleum coke calcined coke arc steelmaking furnace
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