Vibrations in engineering and technology

Naduty Vladimir Petrovich Doctor of Technical Sciences, Professor, Head of the Department of Mechanics of Machines and Processes of Mineral Processing, Institute of Geotechnical Mechanics named M.S. Polyakov of the National Academy of Sciences of Ukraine (49005, Dnipro city, st. Simferopol, 2a, nadutyvp@gmail.com)

Sukharev Vitaliy Vitalievich Сandidate of technical sciences, Senior Researcher, Department of Machine Mechanics and Mineral Processing, Institute of Geotechnical Mechanics named M.S. Polyakov of the National Academy of Sciences of Ukraine (49005, Dnipro city, st. Simferopol, 2a, agnivik@ukr.net)

Kostyrya Sergey Vladimirovich Сandidate of technical sciences, Junior Researcher, Department of Machine Mechanics and Mineral Processing, Institute of Geotechnical Mechanics named M.S. Polyakov of the National Academy of Sciences of Ukraine (49005,  Dnipro city, st. Simferopol, 2a, kostyrya81@gmail.com)

Great difficulties arise when processing wet mineral raw materials less than 1 mm, and this problem is given large attention. There is an urgent need to dehydrate the final product of mining to a minimum percentage of moisture. Such raw material includes coal, which in the process of mining and processing forms a large number of small particles with a size of 1.0 ÷ 0.05 mm and, when enriched by froth flotation, is saturated with moisture, which complicates the subsequent use of coal. Also, for the processing of man-made deposits, consisting of ash and slag waste, they must be dewatered for subsequent complex processing, which consists in the use of magnetic separation and fine screening.

Mechanical dewatering devices do not always provide the final moisture content required by the market today. Only free and loosely bound moisture is extracted by mechanical methods, and pore and capillary moisture is not removed. Therefore, various sources of heat are used as an auxiliary process for the dehydration of minerals.

The article presents the results of studies of dehydration of finely dispersed rock mass on a vibration device of a new design. Intensification of the dewatering process is achieved due to the vertical conical screw and the creation of a vibroboiling layer. Preliminary studies have shown the effectiveness of the use of a transport-drying device, while it was possible to reduce the humidity in the finished product from 15% to 5%.

According to the results of the experiments, it was found that during the operation of the transport-drying device, the layer thickness decreases from loading to unloading by 3 times, while the path of movement of the material along the working surface increases 2.5 times, the frequency range of vibration excitation from 1000-1200 rpm, the amplitude fluctuations are 4-5 mm and the temperature of the supplied air is 50-80 Сº. Thus, the proposed dewatering device can be used in the mining industry, since, in addition to transportation, it is also capable of dewatering wet material with sufficient efficiency.

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