National Mineral Resources University, Saint Petersburg, Russia

V. M. Sizyakov, Head of the Chair of Non-ferrous Metals Metallurgy, phone: +7 (812) 328-82-67
O. A. Dubovikov, Assistant Professor of the Chair of Furnace Technologies and Energy Resource Processing
N. V. Nikolaeva, Assistant of the Chair of Concentration of Minerals
M. G. Yakovlev, Post-graduate Student of the Chair of Concentration of Minerals

Shows the global trend of increasing the production of primary aluminum, which is directly connected not only with increasing production of bauxite and alumina production, but also with the formation of large amounts of waste alumina production. One way to solve this environmental problem is the use of red mud in the steel industry. Red mud contains a set of compounds that are significantly different in their physical-chemical properties. The degree of reduction of iron red mud negative influence chamosite. In connection with what was necessary to study the stability of chamosite in the process of leaching of bauxite by the Bayer process. This paper presents the results of the interaction with different technological regimes of two samples of chamosite MRA with iron containing solutions. Less resistant to alkaline solutions were chamosite with a high content of monoclinic modification as well as a higher degree of oxidation. However a preliminary roasting lightly oxidized among these differences are smoothed by the almost complete decomposition with the formation of chamosite amorphous aluminum and silicon oxides. However, as shown by the results of research, a preliminary roasting in weakly oxidizing medium these differences are smoothed by the almost complete decomposition with the formation of chamosite amorphous aluminum and silicon oxides. Behavior of chamosite during the interaction with alkali and aluminate solutions depends on the ratio of modifications, and the degree of oxidation. Oxidation increases the disorder of the structure of chamosite and orthogonal modification shows great resistance to alkaline solutions.

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