PROCEDIMIENTO PARA LA FABRICACION DE CEMENTO A PARTIR DE MATERIAS PRIMAS QUE CONTIENEN SUSTANCIAS NOCIVAS

摘要

A method of producing cement from raw material containing a harmful substance such as sulphur, alkali and/or chlorine. In order to reduce the circulation of harmful substances a proportion of the gas or material stream is extracted from a zone in the cyclone preheater at which the desired reduction in the content of the harmful substance is achieved with minimum heat loss.