Abstract
	The modern equipments for combustion of municipal waste are part of mayor importance in protection the environment. Process of burning the waste leads to heat rising, which transmits by heat exchanger in the technology during creation of water vapour, which is possible to serve into energetical nets or to produce electrical energy. Another advantage of combustion is significant reduction of municipal waste and inhibition of accumulation of waste to a waste dumps. The combustion of municipal waste leads to quite a number of problems in the equipments which burn this type of waste. One of the serious problems is a corrosion of linings by slag and gas atmosphere which arise during combustion process. The refractory linings usually wears down and depreciates during the service in the incinerators of the municipal waste. The linings are influenced by inner agressive atmosphere to which have to resist. High temeperature, mechanical and mostly chemical wear influences unfavourable the service life of lining. Monolithic refractories with silicon carbide content have good slag corrosion resistance and then they are succesfully used in furnaces linings for incineration of municipal waste. Two refractory castables based on Al2O3-SiO2 with 75 % and 25 % of SiC were exposed to one type of real slag from incineration of municipal waste with content SiO2-CaO-Al2O3-Fe2O3-X at temperature 1250 0C. Slag corrosion is caused by slag penetration into the castables at high temperature. Chemical analysis, optical microscopy and semiquantitative EDX analysis were used to determine the corrosion mechanisms and rates of these materials.