ЗАЛЕЖНІСТЬ ПИТОМОЇ ЕЛЕКТРОПРОВІДНОСТІ ВУГІЛЬНОЇ ШИХТИ ВІД ТЕМПЕРАТУРИ, СТУПЕНЮ ГРАФІТИЗАЦІЇ ТА ГРАНУЛОМЕТРИЧНОГО СКЛАДУ

Abstract

Використовуючи експериментальні дані про електропровідність сипкого коксу та графітованих сумішей, одержано залежності, що дозволяють визначати питомий електричний опір залежно від вмісту сирого й графітованого коксу в суміші в діапазоні температур від 20 до 1000 °С, а також питомого електричного опору для сирого коксу й графітованої суміші залежно від її гранулометричного складу. Using previously obtained experimental data on the electrical conductivity of bulk (carbon) coke and graphite mixtures obtained relationships to determine the value of specific electric resistance depending on the composition of crude coke and graphite in a mixture in the temperature range from 20 to 1000 °C. Also dependence of the electric support for raw coke and graphite convertible mixture depending on its grain size is obtained. Study of the electrical resistivity of carbon materials relates to the field of saving energy in the furnaces of graphitization. Carbon materials are not only the raw materials for electrode manufacturing and coal products, but also are the active electrical resistivity in the furnaces of graphitization and can be recovery and thermal insulation. Resistance value allows drawing conclusions on the structural transformations that took place in the carbon material, caused by external influences on him. Electrical resistivity of the coal charge exhibits a significant influence on the uniformity of distribution of electric power in the volume of the furnace and has a direct impact on product quality and losses of energy. Literature data of electrical resistivity of the coal charge can’t be used without additional analysis and calculations in different technological process conditions. The reason for this is the dependence of properties coal charge not only on the temperature range, but also on the particle size distribution of the starting materials and the degree of graphitization. The article draws previously obtained experimental data on the electrical conductivity of particulate coke and graphite mixtures. Analysis of the experimental data showed that for the materials in question observed correlation of electrical resistivity particulate carbon materials on the particle size and the degree of graphitization. The results of our study allow defining the magnitude of the electrical resistance depending on the composition of the mixture of raw coke and graphitized, the particle size of the starting components of the mixture at temperatures ranging from 20 to 1000 oC. The obtained dependences are necessary to find the optimal properties of the coal charge used in the production, as well as for the development of energy-saving regulations in technological processes of the enterprises.