STUDY OF THE ELECTRICAL RESISTIVITY OF CARBONACEOUS MATERIALS
DOI:
https://doi.org/10.53002/155Ключевые слова:
electrical resistivity, coal, electrical conductivity, temperature, carbonaceous reducing agent, electric ore-thermal furnace, ferroalloys.Аннотация
This paper presents the results of an investigation of the electrical resistivity of coals from the Borly and Saryadyr deposits over the temperature range of 200-1600 °C. The experimental study was carried out using a high-temperature laboratory Tammann furnace and a method for determining the electrical resistance of materials during heating. It was established that the electrical resistivity of both investigated coals decreases systematically with increasing temperature, indicating an increase in their electrical conductivity. Characteristic temperature regions associated with moisture removal, volatile matter release, and structural transformations of the carbonaceous phase were identified. The Borly coal was found to exhibit lower electrical resistivity than the Saryadyr coal over most of the investigated temperature range. At elevated temperatures, the difference between the samples gradually decreases. The obtained results are of practical importance for the selection of carbonaceous reducing agents and the assessment of the electrical characteristics of furnace charge materials during ferroalloy production in electric ore-thermal furnaces.
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