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US 5,626,667 AGranted
Process and apparatus for producing SO.sub.2 -containing gas and cement clinker from waste gypsum
AssigneeBabcock-BSH GmbH
InventorHartwig B ohle
Life of this patent
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Abstract
A method and apparatus for producing SO.sub.2 -containing gas and cement clinker by splitting waste gypsum and anhydrite, using paper fibers as the reducing agent, and firing the splitting residue with additives. The cement forming additives are formed into a mixture with the anhydrite and the mixture is compacted before the final drying and calcining, whereupon the anhydrite containing mixture is subjected to the splitting reaction and firing to form the clinker.
Claims12
A process for producing SO.sub.2 -containing gas and cement clinker from waste gypsum, comprising the steps of:
- (a) transforming waste gypsum into a calcium sulfate anhydrite;
- (b) decomposing said anhydrite in the presence of paper fibers as a reducing agent into an SO.sub.2 -containing gas and a decomposition residue;
- (c) admixing cement-forming additives with said residue to form a mixture;
- and
- (d) firing said mixture to form cement clinker therefrom.
2 more elements
Dependencies are inferred from the claim text.