Известия Томского политехнического университета: Инжиниринг георесурсов (Apr 2023)

RESOURCE-SAVING TECHNOLOGY FOR UTILIZATION OF WASTE DUMPS OF MINING INDUSTRIES

  • Dmitriy A. Kozyr,
  • Valery V. Shapovalov

DOI
https://doi.org/10.18799/24131830/2023/4/3965
Journal volume & issue
Vol. 334, no. 4
pp. 175 – 184

Abstract

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The relevance of research. Global demand for coal in 2022 reached a historic high of 2013 and amounted to 8 billion tons. The increase in demand for coal led to the intensification of its production and, accordingly, to increase in the amount of man-made waste – waste dumps. Waste dumps are dangerous for the environment, but their chemical composition makes it possible to consider them as technogenic deposits. Purpose: development of a resource-saving technology for the disposal of waste dumps in the mining industry with the production of alumina and other useful components. Object: waste dumps of coal mines. Methods: experimental studies of the influence of the sintering regime of the argillite–soda–chalk charge on the degree of extraction of alumina from argillite and on the quality of the sinter: determination of the mass fraction of aluminum oxide by the titrimetric method; determination of the amount of carbon dioxide in samples by the volumetric method; determination of moisture loss and reaction products during calcination by the gravimetric method. Results. The article analyzes the content of useful components in the waste dumps of the Donbass, as well as the existing technologies for extracting alumina from man-made deposits with a low aluminum content. Technogenic waste can be a significant raw material base for production for many years. In addition to obtaining demanded products, the processing of man-made waste will increase the level of environmental safety of mining agglomerations. The article considers the technology of disposal of rock dumps using the method of sintering the charge rock–soda–chalk. It was found that the sintering method with soda addition, despite the relatively low percentage of alumina extraction (75,2 %), can significantly reduce the charge sintering temperature (up to 850 °C) and increase the energy efficiency of the method.

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