Medyanik N.L., Girevaya Kh.Ya., Kalugina N.L., Varlamova I.A., Bodyan Ly.A., Girevoy T.A. Study of the sorption activity of a coal surface

Abstract

This paper contains studies of the hard-cleaning coal structure. The presence of such heterofunctional sorption centers as hydroxyl, carbonyl and carboxyl groups was found. The authors found a correlation between the natural floatability of coals and the quantity of oxygen-containing groups, heat of wetting, electrokinetic potential. Studies of the sorption activity of hard-cleaning coals showed that adsorption centers of nucleophilic water molecules were electrophilic areas of the coal surface resulted from a displacement of the electron density to oxygen-containing groups. Quantum chemical calculations confirmed the presence of a large number of electrophilic adsorption centers which caused the hydrophilicity of the coal surface. It was determined that flotation agents used to extract the coal organic matter had to be agents showing a harder nucleophilic nature than water molecules and having the ability to substitute them in flotation.

Keywords

Heterofunctional sorption centers, natural floatability, electrophilic and nucleophilic adsorption centers, coal organic matter, quantum chemical calculations.

Medyanik Nadezhda Leonidovna – D.Sc. (Eng.), Professor, Head of the Chemistry Department, Nosov Magnito-gorsk State Technical University, Magnitogorsk, Russia. E-mail: This email address is being protected from spambots. You need JavaScript enabled to view it..

Girevaya Khanifa Yanshaevna – Ph.D. (Eng.), Associate Professor, Nosov Magnitogorsk State Technical Univer-sity, Magnitogorsk, Russia. E-mail: This email address is being protected from spambots. You need JavaScript enabled to view it..

Kalugina Natalia Leonidovna – Ph.D. (Education), Associate Professor, Nosov Magnitogorsk State Technical University, Magnitogorsk, Russia. E-mail: This email address is being protected from spambots. You need JavaScript enabled to view it..

Varlamova Irina Alexandrovna – Ph.D. (Education), Associate Professor, Nosov Magnitogorsk State Technical University, Magnitogorsk, Russia. E-mail: This email address is being protected from spambots. You need JavaScript enabled to view it..

Bodyan Lyubov Anatolyevna – Ph.D. (Education), Associate Professor, Nosov Magnitogorsk State Technical University, Magnitogorsk, Russia. E-mail: This email address is being protected from spambots. You need JavaScript enabled to view it..

Girevoy Timur Andreevich – student, Nosov Magnitogorsk State Technical University, Magnitogorsk, Russia. E-mail: This email address is being protected from spambots. You need JavaScript enabled to view it..

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