The method of quantitative assessment of galaxite dissociation degree in the oxide MnO–Al2O3 melt based on the Bjerrum-Guggenheim coefficient concept
Yerekeeva G.S. Narikbaeva G.I. Korsukova I.Y. Kapsalamova F.R.
2024Ore and Metals Publishing house
CIS Iron and Steel Review
2024#2778 - 83 pp.
At present time, taking into account the existing situation in the raw material base of production of manganese ferroalloys, the technologies for obtaining new carbon reducing agents for metals from weakly coking, long-flaming and high-ash coals instead of metallurgical coke are developed intensively. It was caused first of all by the fact, that chemical compositions vary cardinally and become low-melting during the process of development of deposits (in particular manganese ores). As a result, technological violations and decrease of production volumes of manganese alloys occur in the furnaces of manganese production shops. Respectively, establishment of regularities in phases interaction, in forming of their crystallization fields and in reducing reactions of the elements by carbon from liquid melts in multi-component systems is especially important. At the same time, the obtained results allow to optimize their manufacturing technologies from different kinds of raw materials and to predict searching ways or rational charge compositions for processing of different low-melting manganese and other raw materials. The aim of this research is to reveal the features of forming of the crystallization fields of galaxite phase MnO–Al2O3 as the most important metallurgical phase and to determine dissociation degree in molten state, as well as to assess influence of these appearances of completeness of extraction of the aimed elements (Mn) from raw materials into metal to stabilize the technological process. The numerical results of dissociation degree for galaxite congruent compound were obtained using Gibbs energy of dissociation reaction and equilibrium constant of this reaction. Material on behaviour of the osmotic coefficient of Bjerrum-Guggenheim is demonstrated as a criterion of melt structure assessment. It was established that dissociation degree of MnO–Al2O3 compound increases with temperature rise and makes 50 % at the melting temperature.
activity , Bjerrum-Guggenheim coefficient , congruent compound , dissociation degree , melt structure , monovariant phase equilibrium lines , phase diagram
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Metallurgy of Steel, material Science” laboratory, Chemical and Metallurgical Institute named after Zh. Abishev, Karaganda, Kazakhstan
National Center on Complex Processing of Mineral Raw Materials of the Republic of Kazakhstan, Almaty, Kazakhstan
Metallurgy of Steel
National Center on Complex Processing of Mineral Raw Materials of the Republic of Kazakhstan
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