Makeіev S.Yu., Andreіev S.Yu., Ryzhov H.A. The study of the process of physic-chemical destruction of coal by the method of physical modeling

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Parent Category: Geo-Technical Mechanics, 2019

Category: Geo-Technical Mechanics, 2019, Issue 146

Geoteh. meh. 2019, 146, 69-78

https://doi.org/10.1051/e3sconf/201910900054

THE STUDY OF THE PROCESS OF PHYSIC-CHEMICAL DESTRUCTION OF COAL BY THE METHOD OF PHYSICALMODELING

¹Makeіev S.Yu., ¹Andreіev S.Yu., ¹Ryzhov H.A.

¹ Institute of Geotechnical Mechanics named by N. Poljakov of National Academy of Sciences of Ukraine

UDC [622.236.2:541.12]:53.001.57                 

Language: English

Abstract.

The article is devoted to improvement of methods of physic-chemical destruction (PСD) of coal with the purpose of its production intensification. The objective of the research is to study the mechanism of coal dispersion when exposed to various chemical solutions. Laboratory experiments to study the PCD of coal in different liquids were conducted. According to the results, kinetic curves of swelling coal in them transition LF-G stamps is presents. It is established that condition of the realization of a principle possibility of spontaneous dispersion of coal is to reduce its surface energy by 40-60 J/m². It was established that the most intensive physical and chemical destruction of the coal to a particle size from tenths to tens of millimeters occurs in solutions of methylamine and hydrochloric acid. The most severe swelling of the coal was noted in those environment as well. The intensity of swelling is not significantly associated with the characteristics of wetting. The influence of various effects on the PCD parameters of coal was studied by physical simulation. The total time the chemical destruction of coal on the treated area was calculated. The physic-chemical method of destruction of various liquids based on the action of the stresses of swelling, adsorption reduction of strength of the coal, chemical oxidation and  subsequent leaching of the oxidation products at the border of the coal blocks was tested in the laboratory. It was proposed method PCD for coals occurring in the clay rocks of various stages of catagenesis. The scientific novelty of the presented results lies in the justification of the thermodynamic conditions of spontaneous dispersion of coal in which there is a decrease the free energy of the system due to compensation of the increase of free surface energy in the formation of particles with well-developed surface. The results can be used as a pre-preventive effects in technological processes of coal extraction (physic-chemical effects on rock mass as with the aim of strengthening and weakening or destruction) using a variety of chemical solutions that can make a significant contribution to work safety in the coal mining industry.

Keywords: physic-chemical destruction, swelling of coal, physical modeling.

 

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About the authors

Makeiev Serhii Yuriyovych,Candidate of Technical Sciences (Ph.D.), Senior Researcher, Senior Researcher in the Department of Mineral Mining at Great Depths, Institute of Geotechnical Mechanics named by N. Poljakov of National Academy of Sciences of Ukraine (IGTM, NAS of Ukraine), Dnipro, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it. .

Andreiev Serhii Yuriyovych,Candidate of Technical Sciences (Ph.D.), Senior Researcher, Principal Engineer in the Department  of Mineral Mining at Great Depths, Institute of Geotechnical Mechanics named by N. Poljakov of National Academy of Sciences of Ukraine (IGTM, NAS of Ukraine), Dnipro, Ukraine

Ryzhov Gennadiy Oleksandrovych, Master of Science, Junior Researcher in Department of Mineral Mining at Great Depths, Institute of Geotechnical Mechanics named by N. Poljakov of National Academy of Sciences of Ukraine (IGTM, NASU), Dnipro, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it.

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