ASSOCIATED ROCKS OF COAL MINING AS A RAW MATERIAL FOR THE PRODUCTION OF TECHNICAL MATERIALS
DOI:
https://doi.org/10.15421/jchemtech.v34i2.347538Keywords:
coal mining rock, petrographic analysis, hydraulic activity, modulus classification, building materialsAbstract
The relevance of the work is related to solving environmental problems while reducing the use of natural resources and finding ways to create binders using industrial waste as raw materials. The research objective of the work is to investigate the petrographic and hydraulic characteristics of waste rock from the Khmelnitska and Sverdlov mines in the Luhansk region and to explore the potential for their use in the production of construction materials. The elemental composition of waste heap rocks was determined using INCA electron probe microanalysis. Petrographic studing of the samples was carried out using a MIN-8 and Nu-2E microscope in transmitted light in transparent sections. The hydraulic activity of the waste rocks was determined by the amount of absorbed lime CaO. In order to study the behavior of minerals and the amorphous phase of waste rocks at high temperatures, for example, under the conditions of the cement clinker production, sintering was carried out at tmax = 1580 °С for 10 h in an oxidizing medium of O2 and CO2. The studied rocks contain amorphous phases and a crystalline part, in which minerals muscovite, quartz, and clinochlore are presented. The rocks are classified as ultra-acidic. Sintered coal rocks consist of a glass phase in which are distributed crystals of minerals: ferruginous spinels, mullite, and pyroxenes (diopside and hedenbergite), which were formed by high-temperature reactions. The possibility of using coal mining rocks in cement production is confirmed by the similarity of their oxide compositions. The high Fe2O3 content promotes the formation of a melt, in which lime reacts better with other minerals. The combined presence of Al2O3 and Fe2O3 leads to the formation of Ca aluminoferrites with an increased aluminate content. The high content of the glass phase, the presence of Al2O3 and Fe2O3, and the excellent hydraulic properties of the rocks make them suitable for use in the production of lime-slag binders, aluminous cement, and as corrective or active additives to Portland cement clinker. By introducing rocks before sintering the raw material mixture, the Mal and Mc.f. modulus can be adjusted.
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