Method and apparatus for freezeconcentrating substances

Details Method and apparatus for freezeconcentrating substances Method and apparatus for freezeconcentrating substances

B - Operations, Transporting

01

D

B01D 9/04 (2006.01) B01D 9/00 (2006.01)

Patent

CA 2256244

The invention relates to a crystallization apparatus and to a method for crystallizing a liquid from a solution, a mixture of liquids or a suspension. The apparatus comprises a growth zone in a vertically positioned tank, which growth zone is positioned below a nucleation zone. Via a delivery line the seed crystals are fed from the nucleation zone to the bottom end of the growth zone. In the growth zone the ice slurry slowly moves in a vertical direction at such a low velocity heavier particles are able to precipitate and to be discharged at the bottom end. Preferentially, the nucleation zone comprises a vacuum apparatus for effecting a reduction in pressure in the nucleation zone to between 10-4 and 7-10-3 bar. Using the apparatus according to the present invention it is possible for waste water and effluent to be concentrated in a simple manner, clogging of, for example, filters owing to the settling of solid particles being prevented.

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