Estudo dos parâmetros de desgaste de refratários: comparativo de tijolos dolomíticos para linha de escória em panelas de aço de siderurgia

Abstract

Wear of refractories bricks is a gradual process and an inherent problem in steel production, so the search for measures to reduce this wear are essentials, whether related to the study of variables operations practices and/or the lining properties. In steel ladles detect different types of wear mechanisms in different regions in which a ladle is divided. In general, there is no single mechanism acting isolated form in each region what is found is a combination of them, however, in each region predominates one mechanism. The slag line is the region with the lowest time in a steel ladle, and the region which is under the greatest number of requests. The knowledge of the operating variables and their influences in the material wear can then allow the use of a material with properties suitable for this region, in order to provide increased equipment life. This work shows a comparison of dolomitcs bricks, both supplied by Magnesita Refratários Company, evaluating the mechanical and thermal mechanical properties related to oxidation resistance, erosion, hot bending and slags attack. Among the refractories studied, resin dolomitcs refractories showed better results according to the variables related to the material wear. The applicability of a product with improved properties combined with good operating practices can contribute to reduction of wear refractory lining.