Improving the environmental efficiency of ore materials drying based on inertial gravity air separation

Experimental studies and computer analysis of aerodynamic processes carried out at the mine furnaces of Kostanay Minerals JSC confirmed the hypothesis of the predominant influence of the concentration, median diameter, dispersion, temperature and humidity of dust on the efficiency of dust collection, a significant influence on the temperature and humidity of ore dust in the pneumatic dryer of the parameters of the direct flow. The Archimedes force, taking into account gravity, acting on ore dust in the direct current, causes a decrease in the value of the Froude criterion and, as a result, a significant increase in the concentration of lowtemperature wet dust from the direct current relative to the concentration of high-temperature dry dust from the counterflow, at the outlet of the furnace, which significantly reduces the efficiency of dust collecting equipment. In order to reduce the concentration of dust at the outlet of the dryer as a result of increasing the efficiency of dust-collecting equipment, a device built directly into it, operating on the principle of inertial-gravitational, thermal separation, is proposed. To ensure optimal parameters of ore dust at the outlet of the mine furnace by reducing the Stokes equation of motion of a two-phase medium to a one-parameter problem on the dust relaxation factor, a mathematical model of the aeroseparation of dust particles directly in the dryer of the mine furnace as a function of the flow rate, coolant temperature and geometric parameters of the aeroseparator has been developed. The use of an aeroseparator built into the dryer made it possible to increase the environmental efficiency of the shaft furnace to 75−85%, thereby reducing the concentration of aerosol at the outlet by at least 3 times. The proposed design of the aeration separator is currently being used to improve the environmental efficiency of the HSE No. 9 of the DiShr workshop of Kostanay Minerals JSC.

Makarov V. N., Akhmetov R. G., Makarov N. V., Arslanov A. A. Improving the environmental efficiency of ore materials drying based on inertial gravity air separation. MIAB. Mining Inf. Anal. Bull. 2024;(1-1):74—86. [In Russ]. DOI: 10.25018/0236_1493_2024_011_0_74.

Makarov V. N., Dr. Sci. (Eng.), Associate Professor, FGBOU VO “USGU”, orcid.org/00000002-3785-5569, email: uk.intelnedra@gmail.com;
Akhmetov R. G., chief mechanic, JSC Kostanay Minerals, email: info@km.kz;
Makarov N. V., Cand. Sci. (Eng.), Associate Professor, FGBOU VO “USGU”, orcid. org/0000-0001-7039-6272, email: mnikolay84@mail.ru (сorresponding author);
Arslanov A. A. — student, FGBOU VO “USGU”, orcid.org/0009-0003-30820309, email: azamat.arslanov.2000@mail.ru.

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