Fundamental investigations on the high temperature corrosion of ZrSiO4-containing andalusite refractories in cement kiln preheater

• Published in: Journal of the European Ceramic Society Vol. 36; no. 3; pp. 875 - 883
• Main Authors: Madej, Dominika, Szczerba, Jacek
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.02.2016
• Subjects: Andalusite; Corrosion model; Refractories; XRD and SEM/EDS analysis; Zircon; Corrosion model; XRD and SEM/EDS analysis; Andalusite; Refractories; Zircon
• ISSN: 0955-2219; 1873-619X
• DOI: 10.1016/j.jeurceramsoc.2015.10.049

[Display omitted] ZrSiO4-containing andalusite brick after service in cement kiln preheater was analysed by means of XRF, XRD and SEM/EDS techniques in order to determine the corrosion mechanism during 8-months industrial-scale corrosion test in high-alkaline environment at 1100°C. The detailed investigation of the wear mechanism through “post-mortem studies” of the ZrSiO4-containing andalusite brick showed that the K-aluminosilicate phases were formed along with a liquid phase as a consequence of reactions between potassium and andalusite. Ca-aluminosilicate and CaZrO3 phases were also formed. In this paper, a new model of the refractory corrosion was proposed. In modelling the corrosion of zircon-containing andalusite refractory material, ZrSiO4 and Al2SiO5 single grains were used to represent the refractory, so that in all cases the isothermal sections of CaO–Al2O3–SiO2, K2O–Al2O3–SiO2 and CaO–ZrO2–SiO2 systems at 1100°C were used to identify the equilibrium phases and also to explain the mechanism of corrosion.