A method for carrying out an at least partial calcination of the preheated pulverulent raw material consisting of or containing calcium carbonate as well as plant for carrying thereof.

摘要

A method of heat treating a preheated, pulverous raw material consisting of or containing lime, such as cement raw meal. Preheated pulverous raw material is accumulated in a lower portion of a calcination chamber and a substantially incombustible gas is introduced into the accumulation at a sufficient velocity to traverse the accumulation to cause surface portions to overflow a weir. An oxygen-containing gas is introduced into a flame chamber overlying the accumulation. At least one flame is maintained within the flame chamber by burning a fuel therein. The heat necessary for at least partially calcining particles of raw materials suspended in the incombustible gas and oxygen-containing gas is transmitted from the flame to the suspension of raw materials. The treated materials may then be subjected to a finishing calcination and/or any other final heat treatment. An improved calcination plant is disclosed for at least partially calcining a pulverous raw material according to the method of the present invention wherein the heat necessary for at least partially calcining the preheated fluidised raw material is supplied by at least one flame which is maintained in a flame chamber through the introduction of at least one burner pipe into the flame chamber of the plant.