Abstract An apparatus for concentration of dilute solid-liquid slurry by passing through a filter-squeeze out vessel which comprises units formed of a vertical endless-filter belt stretched upon a pair of driving rolls extending across the vessel, these units of the endless-filter belt and driving rolls being set in parallel in the vessel with a definite space in between, the endless-filter belts rotating continuously or periodically; filtering the slurry and the draining filtrate from inside of the filter media to the outside of the vessel. Squeezing rolls and driving rolls are set so as to be tightly contacted to form a separating wall on the open side of the vessel. The layer of solids upon the filter surface are squeezed out, and scraped to the outside of the separating wall as a squeezed out cake. To make the device more effective the filter-squeeze out vessel is assembled with a press device comprising primary and secondary perforated cylinders and a press roll which is wrapped with endless-filter sheet and endless-press sheet. Each cylinder and press roll is arranged in the position so as to form a gradually approaching S-shaped-path, wherein the squeezed out cake is induced and pressed out to obtain the highly concentrated cake in one process step.
In an apparatus for dehydrating a slurry comprising at least one pair of endless, parallel, spaced apart filter belts, each of said belts passing around a driving roll and a counter-driving roll which are vertically arranged and spaced apart from each other within a vessel, and means for driving said roll; the improvement comprising a squeezing roll disposed between, and in contact with, the driving roll of one filter belt and the driving roll of the other filter belt; a scraper positioned in contact with said squeezing roll; and outlet apertures provided at the bottom of said vessel within the region enclosed by each of said filter belts for discharging the filtrate therefrom.
Claim 2
Dependent Claim
113 words
In an apparatus for dehydrating a slurry comprising at least one pair of endless, parallel, spaced apart filter belts, each of said belts passing around a driving roll and a counter-driving roll which are vertically arranged and spaced apart from each other within a vessel, and means for driving said roll; the improvement comprising a squeezing roll disposed between, and in contact with, the driving roll of one filter belt and the driving roll of the other filter belt; a scraper positioned in contact with said squeezing roll; and outlet apertures provided at the bottom of said vessel within the region enclosed by each of said filter belts for discharging the filtrate therefrom.
Claim 3
Dependent Claim
53 words
An apparatus according to claim 1, each said roll having an end portion of reduced cross section receiving an edge belt restraining each filter belt from running off the bottom surface of the vessel to thereby prevent the surrounding slurry from mixing with the filtrate within the region enclosed by each filter belt.