Coal serves not only as a starting material for the production of electrode and carbon graphite products, but also acts as an active resistance when loading a graphite furnace, reducing agent and heat insulator. Its electrical resistivity has a significant effect on the uniformity of the distribution of electrical power in the working space of the furnace, which, in turn, affects the quality of the final product and the energy consumption of production. The relevance of the work lies in studying the possibility of using high-ash coals for the production of complex ferroalloys necessary for the metallurgical industry, including the production of ferroalloys. The Saryadyr and Borly coals were chosen as the objects of study. Laboratory tests were conducted in a high-temperature Tamman laboratory furnace. The study of the electrical resistivity of coal was carried out at a pressure of 0.02–0.04 MPa. The study of changes in the electrical conductivity of the coal was carried out in the temperature range from 25 to 1600 °C with a heating rate of 15 °C/min. The main patterns of the formation of electrical resistivity of charge materials as a function of temperature have been identified. This allows for the acquisition of detailed information about the physico-chemical properties of the charge materials using the proposed measurement method. It has been established that, during the melting of high-ash Saryadyr coal, which has a constant electrical resistivity at high temperatures, an optimal regime can be achieved.

ZHAKAN A.M.

1st year doctoral student at Toraighyrov University, Pavlodar, Kazakhstan.

E-mail: armat.01.01@mail.ru, https://orcid.org/0009-0002-3810-0528

KABYLKANOV S.K.

2nd-year doctoral student at D.Serikbayev East Kazakhstan Technical University, Ust-Kamenogorsk, Kazakhstan.

E-mail: kabyl_96@mail.ru, https://orcid.org/0000-0002-1272-2065

BURUMBAYEV A.G.

2nd year doctors of Karaganda Industrial University, Temirtau, Kazakhstan.

E-mail: burumbayev.azamat@mail.ru, https://orcid.org/0000-0001-5276-2259

SADYK ZH.O.

engineer, Zh.Abishev Chemical-Metallurgical Institute, Karaganda, Kazakhstan

E-mail: sadzhad03@gmail.com, https://orcid.org/0009-0006-8557-1532

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electrical resistivity, high-ash coal, complex ferroalloy, temperature, Tamman furnace