Changes in basic bricks from preheater cement kilns using secondary fuels


ISSN 1121-7588
J. Szczerba
AGH – University of Science and Technology, Faculty of Materials Science and Ceramics, Cracow, Poland

Abstract

The changes in magnesia-spinel bricks from preheater cement kilns using alternative fuels were studied. An analysis of the wear mechanism of bricks was made based on the evolution of apparent porosity, the variation of their chemical compositions and investigation of their microstructure in relation to the internal temperature gradient. The investigation shows that persistence of a coating on the basic refractory lining of the sintering zone does not only effectively protect it against the direct influence of the temperature and corrosive reactions with components of the sintered Portland clinker, but also alleviates the influence of volatile components of the kiln atmosphere on the refractories. Dramatic variations of the volatile components in the kiln atmosphere with simultaneous change of manufactured cement clinker type may lead to coating disappearance and direct exposure of the lining to the influence of the high temperature and aggressive corrosion by components of the sintered Portland clinker and the kiln atmosphere. Excess of chloride and SO3 leads to MgO corrosion. Substantial excess of R2O (R = K, Na) leads to intensive corrosion of main components in the colder part of bricks and weakening of the bricks texture.
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