Method for dewatering and drying a liquid/solid slurry and an ap

Details Method for dewatering and drying a liquid/solid slurry and an ap Method for dewatering and drying a liquid/solid slurry and an ap

1988-10-31

1991-03-12

Spear, Frank

Liquid purification or separation

Processes

Separating

210774, 210185, B01D 25168

Patent

active

049991183

ABSTRACT:
The invention discloses an improved method, and apparatus for utilizing the method, for dewatering and drying a liquid/solid slurry. Unlike the prior known method of consecutive material thickening, filtering, crushing and then subsequent drying achieved with an appropriate for each process apparatus, in the present invention all these processes are achieved with only one apparatus.
The apparatus for the implementation of this method comprises consecutively connected filter press, feeding-compressing container with pressure feed chamber and an inbuilt heat exchanger and vacuum collector with a vacuum pump. The advantages of using this apparatus and method are its compactness, limited space required, low energy consumption, environmental cleanliness and the fact that the separated liquid phase can be used as a heat carrier for industrial and municipal needs. In addition, the disclosed process if fully automated.
The summary time for the consecutive implementation of the prior known method, including thickening, filtering, crushing and drying is considerably decreased using the present invention.
The present invention eliminates the transportation costs and facilitates, which are unavoidable in the utilized up to now method.
Moreover, in the drying process only a fraction of the residual liquid is vaporized, which pushes out the remaining part without its evaporation. Further, there is extraction of salts dissolved in the liquid, since the liquid is not vaporized.

REFERENCES:
patent: 3342123 (1967-09-01), Ermakov et al.
patent: 3608610 (1971-09-01), Greatorex
patent: 4209404 (1980-06-01), Yoshida

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