Thermodynamically Equilibrium Compositions of the Products Formed During the Filtration Combustion of the Metal-Containing Mixtures

E.A Salgansky,A.Yu Zaichenko,M.V Tsvetkov,D.N Podlesniy

doi:10.18321/ectj998

E.A Salgansky, A.Yu Zaichenko + Show 2 more

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https://doi.org/10.18321/ectj998

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Abstract

Thermodynamic calculations for describing the compositions of the products formed in conditions of the filtration combustion of the metal-containing mixtures were carried out. The analysis of the equilibrium compositions of the products was carried out using the TERRA high-temperature thermochemical equilibrium calculation program. According to the results of calculations, the metals were divided into two groups. First one forms both the condensed and gaseous phases and in the second one ‒ metals that are only in the condensed phase. In case of the presence of metal compounds in the gas phase, as a rule, these are the following compounds: metals, oxides, hydroxides, hydrides, sulfides and metal sulfates. Metals of the second group cannot be subjected to mass transfer under conditions of the filtration combustion wave and will remain in solid combustion products (in ash).

Highlights

At present time the rare elements are used in various fields of technology on an ever-increasing scale
Metals of the second group cannot be subjected to mass transfer under conditions of the filtration combustion wave and will remain in solid combustion products
Under conditions of the filtration combustion wave, due to constant evaporation and condensation, it is possible to organize the mass transfer of compounds of metals of the first group in order to concentrate them in a specific zone of the reactor (Fig. 4)

Summary

Introduction

At present time the rare elements are used in various fields of technology on an ever-increasing scale. The rare elements are those whose content in the earth’s crust is below 0.1%. The scale of production of such elements is small, but without them, the development of electronics, optics, metallurgy and other industries is impossible [1,2,3]. The largest consumers of rare and precious metals are the countries that have achieved the greatest success in scientific and technological progress: the USA, China, countries of Western Europe, Japan [4, 5]. Demand for the rare and precious metals required for the innovative development of industrial countries will remain stable for a long time [6]

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