Pressurized filter

Details Pressurized filter Pressurized filter

B - Operations, Transporting

01

D

182/85

B01D 29/00 (2006.01)

Patent

CA 1129786

ABSTRACT OF THE DISCLOSURE The present invention provides; in an intermittently operating pressurized filter for concentrating a solid matter suspension, comprising a filtering tank having a roof at the upper end thereof, an inlet conduit connected to said filtering tank, a feed pump connected to said inlet conduit for introducing the suspension to be filtered under pressure into said filtering tank, a valve located in said inlet conduit between said feed pump and said filtering tank for removing concentrated sludge, a valve located in said draining conduit, a plurality of fil- tering elements dependently supported from said roof in said filtering tank and arranged so that the filtrate flows through said filtering elements, a filtrate collecting tank mounted on said filtering tank with said roof forming a partition there- between so that the filtrate flowing into said filtering ele- ments flows into said filtrate collecting tank with the sludge in the solid matter suspension collecting on the outer surface of said filtering elements within said filtering tank, the sludge collecting on the external surface of the filtering elements being periodically removable by cutting off the pressure within said filtering tank and opening said draining conduit for providing an exit flow path from said filtering tank, whereby the filtrate within said collecting tank passes in coun- tercurrent fashion through said filtering elements back into said filtering tank and removing the concentrated sludge collec- ted on the external surfaces of said filtering elements, a fil- trate draining conduit connected to said collecting tank for removing the filtrate during the filtering operation by the effect of the pressure produced by said feed pump in directing suspension through said inlet conduit into said filtering tank, said collecting tank being of an enclosed construction, the improvement which comprises a washing tank connected to said draining conduit at a position spaced outwardly from said fil- tering tank with said valve therein located between said wash- ing tank and said filtering tank, a fall pipe connected to said filtrate draining conduit at one end and to said washing tank at the other end, a valve located in said fall pipe between said filtrate draining conduit and said washing tank whereby said filtrate draining conduit from said collecting tank being placeable under atmospheric pressure by opening said valve in said fall pipe.

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