Process for the calcination of filter cakes with high solids contents being partly pre-dried in a directly heated rotary kiln
AssigneeBayer Aktiengesellschaft
InventorsBernd-Michael Holle, Peter Beumer, Rolf M. Braun, Hilmar Rieck, Jurgen Kischkewitz, Gerhard Wiederhoft
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Abstract
A process for calcining a filter cake in a directly heated rotary kiln wherein part of the filter cake is separated from the entire mass of filter cake, the separated portion is predried and recombined with the remainder portion and the combined predried and remainder portion is calcined. The filter cake can be inorganic solids such as oxides of titanium, chromium (III), zinc and iron.
Claims11
A process for the calcination of a filter cake comprising a) filtering a raw material to form a filter cake, b) separating a part of the filter cake and pre-drying the separated part, c) combining the pre-dried separated part with the remainder of filter cake remaining after the separating, d) introducing the combined filter cake of c) into a directly heated rotary kiln and e) calcining the combined filter cake of c).
Dependencies are inferred from the claim text.