Питання хімії та хімічної технології (ННІ УДХТУ)

ENG: Voprosy Khimii i Khimicheskoi Tekhnologii / Issues of Chemistry and Chemical Technology (USUCT)

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Investigation of Phase Equilibria in the MnO–Al2O3 System by Differential Scanning Calorimetry Method
(Ukrainian State University of Science and Technologies, Dnipro, 2025) Proidak, Yurii S.; Gladkykh, Volodymyr A.; Ruban, Artem V.; Riabtsev, O. O.
ENG: All slag from the production of manganese ferroalloys can be conditionally attributed to the system MnO–CaO–SiO2–Al2O3, since the sum of these oxides reaches 95–98% with MnO content from 18% to 48%. On the practical side, it is crucial to know the peculiarities of the behavior of silicate systems over a wide temperature range and in the presence of various additives. Differential scanning calorimetry was employed to study concentration–temperature transformations in melts corresponding to manganese aluminate, the low-temperature eutectic E1, and a manganese-rich region with 10% Al2O3 content. The conducted research indicates a congruently melting nature of manganese spinel MnAl2O4. The preservation of short-range order during the melting of MnAl2O4 affects the thermodynamic stability parameters of the compound and the temperature at the onset of manganese recovery during carbothermic reduction. The congruent melting of manganese spinel implies the presence of a second eutectic E2, positioned between MnAl2O4 and Al2O3. According to experimental data, the melting temperature of eutectic E2 is lower, approximately 1720 Celsius degrees.