Empress Catherine II Saint Petersburg Mining University, St. Petersburg, Russia

V. M. Sizyakov, Doctor of Technical Sciences, Scientific Director of the Scientific Center “Issues of Processing Mineral and Technogenic Resources”, e-mail: Sizyakov_VM@pers.spmi.ru
R. V. Kurtenkov, Candidate of Technical Sciences, Associate Professor, e-mail: Kurtenkov_RV@pers.spmi.ru
R. I. Maksimova, Post-Graduate Student, e-mail: Maksimova_RI@pers.spmi.ru

International Competence Centre for Mining Engineering Education under the auspices of UNESCO, St. Petersburg, Russia

V. N. Brichkin, Doctor of Technical Sciences, Head of the Science Project, e-mail: Brichkin_VN@pers.spmi.ru

Modern technologies for the processing of aluminium-containing raw materials invariably pose questions regarding the composition and properties of complex calcium aluminates, the practical significance of which not only remains within the existing technological processes for producing binding compositions, but also develops in
connection with the complex processing of aluminosilicate raw materials and the potential for their individual synthesis for obtaining new types of by-products. In this connection the task of the performed research was to determine the composition and properties of calcium hydrocarboaluminate (CHCA) during its obtaining using alumina production solutions, depending on the nature of the alkali metal cation in the Na₂O(K₂O) – CaO – Al₂O₃ – CO₂ – H₂O system. The performed works included the laboratory synthesis of calcium hydrocarboaluminates, in relation to the conditions of aluminosilicate raw materials processing by sintering. The obtained samples were subjected to a range of analytical methods, including differential thermal analysis, X-ray phase and X-ray fluorescence analysis, laser microanalysis and electron microscopy. Noticeable differences in the laboratory synthesis of CHCA based on sodium and potassium aluminate solutions in terms of the degree of conversion of calcium oxide into CHCA and its yield, the content of CHCA in the precipitate and its stoichiometry with CO₂ saturation from 0.79 to 0.62 mol, respectively, and for the industrial sample 0.45 mol, as a result of changes in the physicochemical and technological conditions of synthesis, have been established. The efficacy of utilising a complex physicochemical analysis of calcium aluminates, predicated on the determination and consideration of the phase composition of the precipitate and the characteristic chemical alterations of the system during the interaction of the lime component with the aluminate solution, is demonstrated. This approach, based on the findings of chemical, X-ray phase and combined thermal analysis, facilitates the determination of the material composition of multicomponent precipitates and the stoichiometry of CHCA.

The present work was carried out with the support of the International Competence Centre for Mining Engineering Education under the auspices of UNESCO under the project “Science”, St. Petersburg, Russia.

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