Hot Corrosion Resistance of AluminosiSscate Refractories -Comparative Tests in the Secondary Combustion Chamber of a Hazardous Waste Incinerator

摘要

Alkali attack is an important problem that refractories have to encounter in many applications. The thermodynamic stability of the refractory in contact with the alkalis depends on the brick temperature and the chemical and mineralogical composition of the refractory. In the literature, exhaustive studies by Jacobson et al. on Al2O3-SiO2 ceramics indicate that at temperatures below 1100 °C [1-5], high alumina contents are more resistant, whereas at temperatures above 1100°C, low alumina contents should be preferred in view of the detrimental β-alumina formation. Under industrial conditions, this empirical rule of thumb needs to be confirmed by tests be- fore choosing a refractory material. The present study deals with the interactions between aluminosilicate refractories and the corrosive environment in the secondary combustion chamber of a hazardous waste incinerator.