Apparatus for producing SO.sub.2 -containing gas and cement clinker from waste gypsum
AssigneeBabcock-BSH GmbH
InventorHartwig Bohle
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.
Claims9
An apparatus for producing SO.sub.2 -containing gas and cement clinker from waste gypsum, comprising:
- a mixer for mixing moist waste gypsum, paper pulp containing paper fibers constituting a reducing agent for the decomposition of a gypsum anhydrite and cement-clinker-forming additives to form a wet mixture;
- means connected to said mixer for mechanically dewatering said wet mixture to produce a dewatered mixture;
- means receiving said dewatered mixture for drying and calcining the gypsum thereof to form the anhydrite;
- and
- a rotary furnace downstream of the means for drying and calcining for reacting said anhydrite in said mixture to decompose said anhydrite to an SO.sub.2 -containing gas and a residue which is reacted with said additives in said rotary furnace to produce cement clinker.
An apparatus for producing SO.sub.2 -containing gas and cement clinker from waste gypsum, comprising:
- a flow tube drier for drying waste gypsum;
- a rotary drum receiving dried waste gypsum from said flow tube drier for calcining said dried waste gypsum to form an anhydrite;
- a mixer for mixing said anhydrite, dry paper fibers and cement-clinker-forming additives to obtain a mixture;
- a device for compacting the mixture;
- and
- a rotary furnace receiving said mixture and decomposing said anhydrite to yield SO.sub.2 -containing gas and a residue reacting with said additives to form cement clinker.
Dependencies are inferred from the claim text.