Method of producing cement clinker
AssigneeKrupp Polysius AG
InventorsDetlev Kupper, Wolfgang Rother
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Abstract
The invention relates to a method of producing cement clinker from fine-grained cement raw material which after preheating and calcining is burnt in a clinker burning zone divided into two stages and is then cooled. Optimum process conditions, particularly in the clinker burning zone, are achieved in that the calcined material is first of all heated to a temperature up to the region of the sintering temperature in a stage formed by a fluidized bed or spouted bed so that a build-up granulation of the material is brought about, whereupon the material thus heated is heated to the sintering temperature in a second stage of the clinker burning zone which acts as the finish-burning stage and tempered to the finishing burn.
Claims12
A method of producing cement clinker from granular raw material having a sintering temperature characteristic of the raw material being treated, said method comprising the steps of:
- preheating the raw material in a preheating zone;
- at least partially calcining the preheated material in a calcining zone;
- heating the partially calcined material in a first stage of a clinker burning zone to a temperature approaching but lower than the sintering temperature while agitating said partially calcined material sufficient to produce only a partial agglomeration of the material;
- further heating the material in a second stage of the clinker burning zone to the sintering temperature to produce cement clinker;
- and
- cooling the cement clinker in a cooling zone.
Dependencies are inferred from the claim text.