Process and apparatus for the volume reduction of pwr liquid...

G - Physics – 21 – F

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161/19

G21F 9/08 (2006.01)

Patent

CA 1201651

19 ABSTRACT OF THE DISCLOSURE An apparatus for the volume reduction of radio- active liquid waste solutions such as evaporator waste bottoms containing boric acid or sodium sulfate and trace quantities of radioactivity through a vacuum evaporative cooling crystallization process or an evaporative crystal- lization process. A crystallization unit has an internal baffle which separates the center portion of the unit into a quiescent zone where crystallization can be effected and an inner chamber into which the liquid waste is tangen- tially introduced. The waste is circulated from the bottom of the crystallization unit through a heat ex- changer which adjusts the temperature of the liquid waste and maintains the temperature within a predetermined range. The vacuum draws off a portion of the solvent in the solution. Upon the crystallization of the liguid waste solution to a degree which renders a solid-liquid slurry, the slurry is removed from the apparatus for further treatment.

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