Ural Energy Institute, Ural Federal University named after the first President of Russia B. N. Yeltsin, Ekaterinburg, Russia:
V. A. Munts, Professor, Head of a Chair “Heat Energy and Heat Engineering”
S. A. Ivakina, Post-Graduate Student of a Chair “Heat Energy and Heat Engineering”, e-mail: svetlana-ivakina@mail.ru

JSC “Chelyabinsk Zinc Plant”, Chelyabinsk, Russia:
V. M. Terentev, Leading Production Engineer of Engineering Center

The task of this scientific work was the definition of the velocity constant of chemical reaction of zinc concentrate (charge) for calculation of gas generation in fluidized bed. The obtained calculation data are necessary for thermal processes modeling in fluidized layer furnace for optimization of its operation. Charge and its basic components — zinc and iron sulfides — were investigated for research of oxidation kinetics of zinc concentrate in fluidized bed furnace. All experiments were carried out on simultaneous thermal analysis tool NETZSCH STA 449 F3 with 10 mg of close-cut fraction hangings at various temperatures. The sample was heated in argon, and, reaching the required temperature, the 28% oxygen-enriched air was supplied. The hanging mass and relative concentration of gas components were measured in the real time mode. According to the experimental data, there were defined the values of activation energy and preexponential factors of oxidation reactions of sphalerite, pyrite and charge. There was made a conclusion that oxidation reaction of zinc sulfide has a first oxygen load, oxygen oxidation reactions of pyrite and sphalerite are in inter-kinetic area (when the whole particle volume is reacted), and the charge oxidation velocity constant is decreased (in comparison with the velocity of oxidation of pure sphalerite proportionally to its content in charge). Analysis of gas generation in fluidized bed during the annealing of zinc concentrate using the obtained constants of chemical reaction velocities allowed to obtain the formula for definition of the specific consumption of annealed zinc concentrate depending on the oxygen concentration in blowing.

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