LLC “UMMC-Holding”, Verkhnyaya Pyshma, Russia:

A. M. Panshin, Technical Director

Ural Federal University named after the first president of Russia B. N. Yeltsin, Ekaterinburg, Russia:
V. I. Matyukhin, Assistant Professor, Chair of Thermal Physics and Informatics in Metallurgy, e-mail: matyhin53@mail.ru
O. V. Matyukhin, Assistant Professor

JSC “Chelyabinsk zinc plant”, Chelyabinsk, Russia:
P. A. Kozlov, Head of Engineering Center

Peculiarities of heat and mass transfer processes under conditions of counter flow movement of charge and gases were established by conventional division of working space of rotary furnace on processing zones of drying, sulfate and carbonate decomposition, materials recovery (reaction zone), oxidative and clinker cooling. There were determined the regularities of changes in gaseous medium and materials temperature in working space of heating unit, depending on the ratio of specific heats of charge flow and gas flow compo nents. A progressive increase in flow heat capacity is observed in the time of gases transfer in working space of rotary tube. Peculiarities of specific heat changes of materials flow depend on intensity of heat and mass transfer processes development in separate technological zones. Heat capacity of material flow is increased in drying and reduction zones due to development of endothermic processes, and values of this characteristics are reduced in oxidizing and cooling zones. The most intensive development of heat transfer processes occur in zone of charge preheating and formation of heat carrier flow with the ratio of W_m < W_r. The least intensity of heat exchange with formation of high-temperature gas flow is observed in oxidizing furnace zone. Considering the peculiarities of thermal compression of bulk materials, there were defined the intervals of their solid and liquid phase sintering, indicating conditions of intensive development of rotary kiln process without breaking of high temperature firing conditions. Rotary kiln process of ore components occurs mainly in the solid phase sintering mode, which determines the minimum diffusion difficulties for development of recovery processes with maximal zinc output.

1. Korotich V. I. Teoreticheskie osnovy okomkovaniya zhelezorudnykh materialov (Theoretical basis of pelletizing of iron ore materials). Moscow : Metallurgiya, 1966. 151 p.
2. Klassen P. V., Grishaev I. G. Osnovy tekhniki granulirovaniya (Basis of granulation technics). Moscow : Khimiya, 1982. 272 p.
3. Khzmalyan D. M. Teoriya topochnykh protsessov (Theory of furnace processes). Moscow : Energoatomizdat, 1990. 352 p.