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HEAVY NON-FERROUS METALS
ArticleName Research on wear of chromite-periclase refractories in a reaction zone of zinc waelz-kiln
DOI 10.17580/tsm.2016.12.02
ArticleAuthor Akselrod L. M., Yarushina T. V., Maryasev I. G., Nechunaev V. L.
ArticleAuthorData

LLC “Magnezit Group”, Moscow, Russia:

L. M. Akselrod, Technical Director

 

LLC “Magnezit Group”, Satka, Chelyabinsk region, Russia:
T. V. Yarushina, Head of Administrative Department of Technological Developments
I. G. Maryasev, Head of Laboratory of Materials Science (Department of Technological Developments)

 

LLP “Dalmond”, Pavlodar, Kazakhstan:
V. L. Nechunaev, Executive Officer of the Representation in the Republic of Kazakhstan

Abstract

This article studies the wear factors of lining in zinc Waelz-kiln and presents the results of scientific-research work, which aims to increase its durability. Special attention was paid to a technology for production of chromite-periclase refractories. It also discusses a contemporary method for perfecting the structure of chromite-periclase refractories, which is based on analysis of corrosion effect on their reaction charge. A method for modeling a process of introducing a melt of reaction charge into refractory structure was developed. Refractories wear was determined in a Waelz-kiln according to a frontal scheme through a series of consequent transformations of their microstructure. Based on the results of researching corrosion of refractory products under the influence of fayalite slag, chemical composition of such chromite-periclase refractories was chosen (more resistant to the components of materials that undergo the Waelz-process). The most important advantage of the recommended refractories (brand GMHP-2SP) is their low thermal conductivity and gas permeability of the structure, as well as the occurrence of protective characteristics of the matrix during their operation, which is due to complex spinelide forming (Mg, Fe, Zn)(Fe, Al, Cr)2O4 along the boundaries of periclase grains, protecting the latter from corrosion. Structural changes of refractories under the influence of corrosion materials in the samples after tests, performed in a rotary kiln, are consistent with analogue structural changes in the samples that were cut out from lining after industrial testing of the GMHP-2SP chromite-periclase refractories. The usage of these refractories for lining of Waelz-kiln reaction zone ensured a stable conduction of the highly productive technological process and increased the overhaul interval.

keywords Waelz-process, rotary kiln, chromite-periclase refractory, charge, reaction zone, structure, testing method
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