Rotary vacuum filtration drum with valved hopper cake treatment

Details Rotary vacuum filtration drum with valved hopper cake treatment Rotary vacuum filtration drum with valved hopper cake treatment

1994-02-17

1995-11-28

Dawson, Robert A.

Liquid purification or separation

Filter

Movable medium

210406, 210408, 210409, 210411, 210418, 210472, 414220, 414221, B01D 3306

Patent

active

054704731

ABSTRACT:
An assembly for recovering crystals from a slurry comprises a filtration unit including a rotatably mounted cylindrical filter, a slurry input for receiving slurry pressurized by a pump. The filtration unit has an outlet for discharging crystalline material separated from the slurry by the filtration unit. A first hopper connected to the filtration unit at the discharge outlet thereof is provided at a downstream side with a first valve unit which is in turn connected to a second hopper on a downstream side. A second valve unit is coupled to the second hopper at a downstream side thereof. Each of the valve units includes a rotatably mounted dome shaped valve member. The second hopper is provided with a vent extending to a gas storage tank. A conduit links the hoppers to one another for substantially equalizing pressure in the hoppers prior to an opening of the upstream valve during a discharge procedure. At least one of the hoppers is provided with a blower mechanism for removing crystalline material caked on a wall of the one of the first hopper and the second hopper.

REFERENCES:
patent: 1774044 (1930-08-01), Sweetland
patent: 2352303 (1944-06-01), Young
patent: 2655265 (1953-10-01), Little
patent: 2899068 (1959-08-01), King et al.
patent: 4137935 (1979-02-01), Snowdon
patent: 4465497 (1984-08-01), Howeth
patent: 4514129 (1985-04-01), Legille et al.
patent: 4728250 (1988-03-01), Wilhelm et al.
patent: 5093001 (1992-03-01), Ueda

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