Vacuum belt filter
OwnerHenri G. W. Piersoninventor
Life of this patent
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Abstract
Slurry required to be filtered is supplied to a downwardly inclined feed section of intermittently-moving belt 25 by way of supply pipe 20. Inclination of succeeding vacuum section of belt 25, over vacuum boxes 17, ensures even distribution of thin layer of slurry over belt 25, dependent upon angle of inclination, in range 4.degree. to 20.degree. to horizontal (an angle of 8.degree. being illustrated). Subsequently resultant filter cake layer is subjected to mechanical dewatering by an expansible membrane of a lower pressure plate 23 being expanded to press belt 25 with filter cake thereon against underside of counterplate 24.
Claims11
In a vacuum belt filter mechanism for filtering a filtrate from a slurry the combination of:
- an endless filter belt movable unidirectionally through a forwardly advancing upper working run and a lower return run, drive means for driving the belt intermittently, guide means for guiding the belt through a feed section and a vacuum section of the upper working run, the belt in the vacuum section being upwardly inclined in the forward advancing direction of belt movement by an angle of from 4.degree. to 20.degree. to the horizontal, feed means for feeding the slurry onto the belt at the feed section, and vacuum means positioned below belt at the vacuum section and being operative for exerting a vacuum and draining the slurry through the belt leaving a filter cake residue deposited on the belt, the drive means being operative for belt advancement only when the vacuum means is non operative.
Dependencies are inferred from the claim text.