Abstract: The invention relates to a process for the disposal of combustible refuses in the manufacture of cement clinker by preheating and partly calcining the cement raw meal in a preheater, burning in a rotary kiln and subsequently air cooling the clinker, the refuse being separately burned and the flue gas obtained thereby transfers its heat to the cement raw meal. In the process according to the invention, hot exhaust air of the clinker cooler is fed to the refuse incineration and flue gas having a temperature of from 1000.degree. to 1400.degree. C. is produced during said incineration by means of which the cement raw meal is calcined. The slag of the refuse incineration is separately discharged.

Abstract: A method and apparatus for burning combustible waste materials such as municipal and other refuse, utilizing combustion of the waste materials in a rotary tubular kiln at temperatures above 1200.degree. C., using combustion air in the temperature range between 300.degree. and 800.degree. C. with a small air excess and a reduced quantity of flue gas. The invention further includes heat transfer from the hot flue gas into the combustion air by means of a heat exchanging solid, whereby the solid is heated in contact with the flue gas and subsequently is cooled in contact with air. This air is heated to combustion air temperature and is conducted to the firing of the rotary kiln. The solid may also simultaneously bond noxious substances in the flue gas.