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80-th ANNIVERSARY OF CHELYABINSK ZINC PLANT
Technologies, implemented in production
ArticleName Skull formation in fluid-bed furnaces during fine sulphide zinc concentrates' calcination
DOI 10.17580/tsm.2015.05.04
ArticleAuthor Terentev V. M., Kondratyuk A. A., Knaub E. Yu., Nesmelov V. Yu.
ArticleAuthorData

JSC “Chelyabinsk Zinc Plant”, Chelyabinsk, Russia:

V. M. Terentev, Leading Engineer-Technologist of Engineering Center
A. A. Kondratyuk, Head of Calcination Shop, e-mail: aak@zinc.ru
E. Yu. Knaub, Senior Foreman of Calcination Shop
V. Yu. Nesmelov, Head of Bureau of Reconstruction and New Equipment of Engineering Center

Abstract

Provision of stable and regulated process is an urgent task during processing of sulphide zinc concentrates with different chemical and particle size composition in fluid-bed furnaces. This problem is solved by the choice of temperature condition of calcination and calculation of charge composition, as a mixture of various zinc concentrates. The current trend in the change of zinc concentrates’ grainsize composition (average particle size decrease) and increase of their impurities of iron, lead, copper and silica defines the necessity of the studies of the concentrate calcination ability during calcination, which is undesirable for the process in fluid-bed furnace. This article considers the effect of particle size composition on the probability of agglomerative sinter formation during calcination and effect of impurities in the concentrates on the received sinters' strength. The threshold particle size of the concentrates (100 μm) was defined. The value of threshold particle less than 100 μm leads to formation of agglomerative sinter in the process of calcination. Agglomerative sinters with different mechanical strength were obtained during calcination of different concentrates with fixed values of particle size, temperature and time. There was defined the dependence of the sinter strength on iron content in the concentrate (from 20 kPa at 1.43% Fe to 540 kPa at 14.85% Fe). The changes in the process of calculation and charge preparation for calcination in fluidized bed furnaces and furnaces' design were made on the basis of current and previous researches. These changes made possible to prevent adverse effects of the foregoing factors and ensure stable technology management.

keywords Sulphide zinc concentrate, calcination, calcination fluid-bed furnace, skull, kinetics of oxidizing reactions, grain particles composition, agglomerative sinter
References

1. Klyayn S. E., Kozlov P. A., Naboychenko S. S. Izvlechenie tsinka iz rudnogo syrya (Zinc extraction from ore raw materials). Ekaterinburg : Ural State Technical University-Ural Polytechnic Institute, 2009. 491 p.
2. Constantineau J. P., Bouffard S. C., Grace J. R., Richards G. G., Lim C. J. Demonstration of the conditions conducive to agglomeration of zinc calcine in fluidized bed roasters. Minerals Engineering. 2011. Vol. 24. pp. 1409–1420.
3. Abramovskaya L. A., Saprygin V. A., Saprygin A. F., Ushakov N. N. Issledovanie prichin nastyleobrazovaniya pri obzhige v pechakh kipyashchego sloya nizkosortnykh sulfidnykh tsinkovykh kontsentratov (Research of skull formation reasons during calcination of low-grade sulfide zinc concentrates in fluidized-bed furnaces). Tsvetnye Metally = Non-ferrous metals. 2003. No. 2. pp. 29–33.
4. Nyberg J. Characterization and control of zinc calcination process. Oulu : Oulu university press, 2004. 114 p.
5. Panshin A. M., Kozlov P. A., Terentev V. M. Kinetika okisleniya sulfidnykh tsinkovykh kontsentratov (Kinetics of oxidation of sulfide zinc concentrates). Tsvetnye Metally = Non-ferrous metals. 2014. No. 2. pp. 34–37.
6. Marchenko N. V., Vershinina E. P., Gildenbrandt E. M. Metallurgiya tyazhelykh tsvetnykh metallov (Metallurgy of heavy non-ferrous metals). Krasnoyarsk : Professional Development Institute of Siberian Federal University, 2009. 394 p.

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