About the authors
| First name, Middle name, Last name, Scientific degree, Scientific rank, Current position. Full and brief name of the organization, The organization address. | Vladimir Z. Abdrakhimov, Doctor of Technical Sciences, Professor, Samara State University of Economics, Samara, Russian Federation E-mail: This e-mail address is being protected from spambots. You need JavaScript enabled to view it Evgeny G. Safronov, Candidate of Economic Sciences, Associate Professor, Samara State Technical University, Samara, Russian Federation E-mail: This e-mail address is being protected from spambots. You need JavaScript enabled to view it |
| Title of the article | Influence of sludge from flotation coal treatment on the technical parameters and porosity structure of expanded clay |
| Abstract. | Problem statement. The depletion of high–quality traditional well-swelling montmorillonite clays for the production of expanded clay requires the use of corrective additives containing a calorific value of at least 3,000 kcal / kg, as a result of which swelling increases. Such tools for recycling secondary raw materials are used by advanced countries for environmental safety. Efficient recycling of large-tonnage waste from the fuel and energy complex in the production of expanded clay will significantly reduce the harmful effects on the environment and improve the company’s performance. The analyzed geography of the localization of processing plants showed that 85% of all coals extracted from the bowels of the earth are undergoing enrichment, including 68% in the Rostov region. The purpose of the work is to analyze the impact factor of sludge from flotation coal treatment on the functional properties and macroporous structure of expanded clay with the participation of bentonite clay. The objectives of the study are to determine the compositions of the resource sources being developed: chemical – oxide and element-wise, mineralogical and fractional, as well as technological parameters; to characterize the parameters of sludge from flotation coal treatment and bentonite clay for the creation of expanded clay; to recommend reasonable formulations for recycling large-tonnage coal-treatment sludge into mass production of expanded clay; to investigate the effect of coal-treatment sludge on the internal and external macroporous structure of expanded clay, taking into account the analysis of the formed closed pores. Results. Due to the increased carbon content in the flotation waste (C=10.77%) and its combustion during firing, gas is released, which contributes to an increase in the swelling coefficient. Expanded clay swelling is identified as the result of excessive gas pressure inside the micropores, contributing to their expansion, which is directly dependent on the viscosity of the pyroplastic melt. Conclusions. The study of expanded clay with a 5-10 mm fraction has shown that formulations containing 30% (composition No. 4) and 35% (composition No. 5) coal-treatment waste are preferred in terms of brand, the grade of which is M250, but composition No.5 does not meet the conditions for frost resistance. Thus, the optimal composition should include composition No. 4. |
| Keywords. | flotation waste from coal treatment, mudstone, bentonite clay, expanded clay, macroporous structure, technical indicators |
| For citations: | Abdrakhimov V.Z., Safronov E.G. Influence of sludge from flotation coal treatment on the technical parameters and porosity structure of expanded clay // News of KSUAE, 2025, № 2(72), p. 159-169, DOI: 10.48612/NewsKSUAE/72.14, EDN: KJTCND |
