Method of burning pulverous alkali containing raw materials and kiln plant therefor

Abstract From the Canadian patent

A method is disclosed for burning alkali-containing raw materials such as cement raw meal in a plant having a multiple string cyclone preheater, each string containing at least two cyclone preheater stages, a kiln, and a cooler unit for cooling the burnt material from the kiln by means of air which is subsequently divided into two streams, one stream being passed through the kiln and a kiln string of the preheater, the other stream being passed through a calciner and up through the calciner cyclone string of the preheater. According to the invention the flow of material, from the penultimate preheater cyclone stage of the kiln string is directed to the calciner, at least a part of the …