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

A. M. Panshin, Technical Director

“Chelyabinsk zinc plant” JSC, Chelyabinsk, Russia:
P. A. Kozlov, Head of Engineering Center, e-mail: pac@zinc.ru
V. M. Terentev, Leading Processing Engineer of Engineering Center

Disturbances of zinc concentrates' roasting process in fluid-bed furnaces of modern plants are related to change of chemical composition and physical properties of concentrates. Thermodynamic possibilities of sulfide zinc concentrates' oxidizing reaction were studied and defined for fluid-bed furnace conditions. Definition of technological parameters of roasting is necessary for definition of speed of sulfide zinc concentrates' oxidizing reactions. Kinetics of oxidizing reactions for the solid body – gas system in laboratory fluid-bed furnaces was investigated. Dependence of oxidization ratio on the particle size of original product was defined together with optimal size of concentrate particles, where the oxidation speed is limited by the quantity of feeding oxidizing substance. There were shown the reasons of the furnaces operation declination during the roasting of fine zinc concentrates. There was made a conclusion about the negative influence of the small size particles' predominance in the fluid-bed furnace on roasting process. Roasting products with minimum content of sulfides can be obtained by controlling of grain fineness of the calcine in fluid-bed furnace during roasting. There are presented the recommendations for changing of technological parameters of roasting for industrial furnaces.

1. Korotich V. I., Naboychenko S. S., Sotnikov A. I., Grachev S. V., Furman E. L., Lyashkov V. B. Metallurgiya (Metallurgy). Ekaterinburg : Ural State Technical University, 2001. 395 p.
2. Baram I. I. Makrokinetika geterogennykh protsessov (Macrokinetics of heterogeneous processes). Alma-Ata : Nauka, 1986. 208 p.
3. Kubasov V. L., Kazanbaev L. A., Kozlov P. A., Terentev V. M. Tsvetnye Metally — Non-ferrous metals. 2007. No. 8. pp. 41–45.
4. Panshin A. M., Zatonskiy A. V., Kozlov P. A., Kondratyuk A. A., Terentev V. M. Tsvetnye Metally — Non-ferrous metals. 2010. No. 5. pp. 34–37.