Authors: A.V. Nevedrov, A.V. Papin, I.V. Bobrova, E.A. Makarevich

Title of the article: Investigation of the characteristics of laboratory samples of pitch used as a binder for the electrode industry

Year: 2025, Issue: 1, Pages: 94-101

Branch of knowledge: 2.6.12. Chemical technology of fuel and high-energy substances

Index UDK: 662.749.39

DOI: 10.26730/1999-4125-2025-1-94-101

Abstract: Coal tar (electrode) is the main, priority binding component for the production of various carbon composites worldwide for many reasons: anode masses, electrodes, structural materials, electric coal products, etc. Coal tar as the main raw material component of these products sets the level of physical and mechanical properties of these products, largely determines their quality. The favorable combination of physico-chemical properties – coke-forming ability and low viscosity in the molten state favorably distinguishes electrode coal pitch from other types of binders used to create carbon composites, on the basis of which a wide range of commercial products is obtained. Every year, the existing demand for coal-fired electrode baking in the world increases by 3-4%, and for high-margin products such as, for example, high-quality carbon fibers, the demand increases by more than 10%. The use of coal raw materials – coal tar, a product of high-temperature coking of coal, to produce coal electrode pitches, compared with other types of hydrocarbon raw materials, provides better quality of the electrode pitch, a larger quantity and a higher product yield. When producing coal electrode pitches from coal tar by high-temperature coking of hard coals, the following aspects are the most significant and influencing the formation of the quality of pitches: 1) the quality of coal tar and, accordingly, the quality of coals going to coking, coking technology, physical wear of coal coking furnaces, coke battery as a whole and related equipment and pipelines); 2) temperature and period of thermal effect on coal tar during distillation into fractions; 3) the composition of the gas medium in the reactor, retort (its inertia); 4) pressure in the reactor or retort. The possibility of obtaining electrode coal pitches from coal tar of PJSC Koks has been studied and established. The qualitative characteristics of the pitches were determined, the data obtained were analyzed, and the characteristics of the obtained electrode pitches were matched with the required values of the quality indicators of raw materials for producing electrode products from it in accordance with the requirements of «ГОСТ». It has been established that at 430 °C and at a heating rate of 3 °C/min without isothermal exposure, an electrode coal pitch corresponding to grade B is obtained, which is suitable for producing a wide range of electrode products.

Key words: coal tar coal pitch electrode pitch distillation rectification

Receiving date: 30.09.2024

Approval date: 22.01.2025

Publication date: 12.03.2025

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