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HEAVY NON-FERROUS METALS
Название Investigation of thermodynamics and kinetics of zinc oxide interaction in the composition of calcinated dusts of electric arc furnaces with NaOH
DOI 10.17580/tsm.2017.10.06
Автор Yakornov S. A., Panshin A. M., Kozlov P. A., Ivakin D. A.
Информация об авторе

LLC “UMMC-Holding”, Ekaterinburg, Russia:

S. A. Yakornov, Deputy Technical Director
A. M. Panshin, Technical Director

 

Technical University of UMMC, Verkhnyaya Pyshma, Russia:
P. A. Kozlov, Deputy Director (Scientific-Research and Project Institute on Science), e-mail: p.kozlov@tu-ugmk.com

 

Chelyabinsk Zinc Plant, Chelyabinsk, Russia:
D. A. Ivakin, Head of Technological Bureau of Engineering Center

Реферат

Alkali hydrometallurgical technology, used during the development of a method of processing of dusts of electric-arc steel furnaces makes possible the selective extraction of zinc, remaining iron in solid residue. For the increase of zinc extraction before the alkali treatment of dusts, electric-arc steel furnaces undergo the high-temperature calcination together with calcium oxide. At the same time, zinc is transferred in the free oxide form and its solubility in acids and alkalies increases. We carried out the investigations of thermodynamic and kinetic parameters of the process of interaction of zinc oxide in composition of calcinated dust of electric-arc steel furnace (clinker) with NaOH in water solution with the temperature of 60–100 oC. According to our investigations, zinc can be dissolved with formation of hydroxocomplexes [Zn(OH)4]2– and [ZnO2]2– with the medium pH higher than 14. At the same time, reaction equilibrium displaces to the formation of zincates with 10–15-fold excess of alkaline with reference to zinc. Diffusion mode of reactions leading to zinc dissolution is shown. Activation energy in the temperature range of 70–95 oC is 9.6 kJ/mole. This process can apply the model, described by the generalized equation of heterogeneous process with solvent excess. The investigation results showed the technical possibility and efficiency of dissolution of the products, containing zinc oxide (including electric-arc steel furnace dusts after the considered pyrometallurgical preparation), in alkaline solutions with selective extraction of zinc in solution. Alkaline zincate solutions are subsequently purified from impurities and used for zinc extraction using electric extraction with zinc powder obtaining. Spent zincate electrolyte is secondly used for further cycles of zinc dissolution.

Ключевые слова Electric-arc steel furnace dusts, zinc ferrite, alkaline zincate solution, zinc hydrocomplexes
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