INVESTIGATION OF ENERGY-INTENSIVE ROCK DESTRUCTION EXPOSURE TEMPERATURE-TIME MODE MICROWAVE FIELDS
Destruction refers to the main problems of mining, indicating the possibility of mining and processing rocks, ores and minerals, building materials. In the technological process, when preparing rocks for enrichment, problems of softening and destruction arise. The technology for extracting metals and minerals from hard ores requires significant energy and material costs. To extract metals or other valuable minerals from strong polymineral rocks, complex technological work is carried out on their crushing and grinding. The technology for extracting metals and minerals from hard ores requires significant energy and material costs. To extract metals or other valuable minerals from strong polymineral rocks, complex technological work is carried out on their crushing and grinding. High efficiency of softening or destruction of rocks was shown by thermal and low-frequency electrophysical methods, microwave irradiation. Therefore, the development of a method for optimizing the temperature-time regime of an electromagnetic field of ultrahigh frequencies when it affects the rock destruction characteristics, which makes it possible to make rational technological decisions on energy and resource conservation is an urgent task. The article discusses the dependence of the strength properties of rocks on the effects of waves at high frequencies at different temperature-time regimes. To study the physicomechanical properties of the studied rocks under the influence of microwave fields, methods of dynamic destruction, design and experimental studies were used. In the analysis of changes in rock properties and grinding energy intensity, laboratory measurements and calculation algorithms were used in the Matlab environment. When the temperature of rocks changes, under the influence of microwave waves, structural thermal stresses arise at the boundaries of mineral grains, as well as processes that change physical properties. The specific heat of rocks has been analytically determined for different times of exposure to waves at high frequencies. The optimal time of exposure to waves at high frequencies and the temperature corresponding to the minimum specific energy intensity of destruction for specific rocks are revealed.