Method and plant for manufacturing cement clinker
AssigneeF.L. Smidth & Co. A/S
InventorS.o slashed.ren Hundeb.o slashed.l
Life of this patent
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Abstract
A method and plant for burning sludge or filter cakes during the cement clinker manufacture where the cement is manufactured in known manner by the cement raw meal being preheated, calcined and burned into clinker with subsequent cooling of the clinker and where the sludge is dried and finely divided prior to burning. The drying heat is provided by feeding hot raw meal from either the preheater or a separating cyclone installed in connection with the calciner to the drier unit, which may be a drier crusher. Applicable types of sludge include sewage sludge, beaching earth, paper sludge, fibre rejects, combustible chemical residues, e.g. waste derived from the manufacture of nylons and pesticides, and drill sludge resulting from oil exploration.
Claims14
A method for burning sludge or filter cakes during cement clinker manufacture comprising the steps of preheating cement raw meal, calcining the preheated cement raw meal in a calciner, and then burning the calcined cement raw meal in a kiln, said method further comprising drying the sludge or filter cakes by mixing therewith at least a portion of the preheated or calcined cement raw meal thereby drying the sludge or filter cakes at least partially by means of the heat from the preheated or calcined cement raw meal, and thereafter burning the mixture of dried sludge or filter cakes and cement raw meal in the calciner or the kiln.
A plant for burning sludge or filter cakes during a cement clinker manufacture, said plant comprising a preheater, a calciner, a kiln and a drier unit in which the sludge or filter cakes can be dried, said drier unit being fitted with an outlet for dried sludge or filter cakes and an inlet for untreated sludge, and wherein the drier unit is further provided with a feed point for preheated or calcined raw meal.
Dependencies are inferred from the claim text.