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AssigneeKrauss-Maffei Aktiengesellschaft
InventorsGunther Hultsch, Franz Alstetter, Uwe Breuer
Estimating the term…
A process for the dewatering and particle classification of solids from suspensions, e.g. coal from a slurry in which the coal is transported, makes use of a dewatering centrifuge having two frustoconical centrifuge drum sections of different inclinations such that in a first filtering zone the particles are preliminarily dewatered and then pass by automigration to the next centrifuge drum at which further dewatering takes place. The suspension on the first sieve surface forms a thin layer classification zone having a thickness up to 5 mm and in which the coarse fraction is retained while the fine fraction is passed. The coarse fraction automigrates to the next sieve surface where it is dewatered and the fine fraction separated out in the thin layer classifying zone is then filtered under pressure in a subsequent stage.
In an apparatus for dewatering a slurry containing solids in a particle size range of 0.05 mm to 2.0 mm and in which the solids are classified into a fine fraction and a coarse fraction, the fine fraction is filtered, and the coarse fraction is dewatered, the improvement which comprises:
The improvement defined in claim 4 wherein said first surface is formed by a plurality of curved perforated surfaces mounted upon a circular array of pockets on a rotor, each of said pockets having an outlet for said fine fraction and being positioned to cast said coarse fraction onto said second surface, said second surface being a frustoconical surface disposed outwardly of said pockets on said rotor.
Dependencies are inferred from the claim text.