Abstract: A process and apparatus for the essentially complete recovery of heat, process fluid and yellowcake (U.sub.3 O.sub.8) dust particles normally lost during the drying of yellowcake slurry. The off-gases, consisting of noncondensable gases vaporized fluid, and entrained yellowcake particles, produced in a yellowcake slurry dryer are directed into a condenser in which the off-gases are cooled and condensed by fluid sprays, preferably water. The condensate spent spray fluid and entrained yellowcake particles are collected in the condenser sump. A stream of the condensate and yellowcake particles from the sump is directed into a thickener for the recovery of the yellowcake in the underflow therein and its eventual recombination with the yellowcake slurry being fed to the dryer. A second stream of the spent spray is circulated to the fluid sprays while a third stream is cross-circulated into a bleed chamber.

Abstract: An improved stacking tower is equipped with a dust pollution control system which maintains a negative pressure within the tower and comprises an exhaust means, dust collection and removal means and movable closure means for closing the discharge openings of the tower. A modulating air damper is also provided to adjust the volume of air passing through the tower.