Method and device for filtration
AssigneeFuji Photo Film Co., Ltd.
InventorSadayoshi Itagaki
Life of this patent
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Abstract
A device for filtering slurries comprises a bag-shaped filter medium accommodated in a filter chamber of a filter tank, in which a slurry is supplied, a baffle plate for separating the filter chamber into a side filter chamber and a bottom filter chamber, said side and bottom filter chambers each having an outlet port which can be freely opened and shut, the upper end of said baffle plate being located above the upper surface of a filter cake sedimented on the bottom of the bag-shaped filter medium and a method of filtration by means of the device.
Claims10
A method of filtering slurries to obtain a filtrate and a sedimented filter cake, comprising,
- a. supplying a slurry to a bag-shaped filter medium within a filter tank,
- b. forcing the liquid from said slurry to enter a bottom filter chamber and a side filter chamber, separated from one another by a baffle extending slightly higher than the expected height of the sedimented filter cake on the bottom of said bag-shaped filter medium, to leave a sedimentation of filter cake on the bottom and side walls of said bag-shaped filter medium,
- c. said bottom and side filter chambers having exit ports for the removal of filtrate therefrom, and (d) subsequent to the forcing of the liquid, applying a pressure differential on opposite sides of said bag-shaped filter medium while simultaneously having closed all exit ports of said side filter chamber and having the exit port of said bottom filter chamber open, whereby said pressure differential draws liquid from said filter cake on the bottom of said medium.
Apparatus for filtering slurries comprising,
- a. a filter tank,
- b. filter medium holding means positioned in said tank for holding a bag-shaped filter medium in said tank above the bottom of said tank and separated from the walls of said tank,
- c. a slurry inlet on said tank for introducing a slurry therein at a position which will result in said slurry being supplied to the inner portion of said bag-shaped filter medium,
- d. a baffle, located within said tank on the filtrate side of said bag-shaped filter medium, separating the portion of said tank which will receive the filtrate through the filter medium into a side filter chamber and a bottom filter chamber, said baffle extending to a predetermined height which is slightly above the expected height of the filter cake, and
- e. separate exit ports for the side filter chamber and the bottom filter chamber, said exit ports being freely openable and closeable.
Dependencies are inferred from the claim text.