Process and equipment for the extraction of solid material...

Details Process and equipment for the extraction of solid material... Process and equipment for the extraction of solid material...

B - Operations, Transporting

01

D

161/36

B01D 9/02 (2006.01) B01D 9/00 (2006.01) B01D 33/00 (2006.01)

Patent

CA 1179594

ABSTRACT OF THE DISCLOSURE The present invention provides a process for the extraction of solid material dissolved in a solution by crystallization in which a mother phase in a metastable range is formed by the mixture of said solution, crystallization being in said mother phase, said mother phase being further cooled to increase crystal growth and form a crystal slurry, said crystals then being separated therefrom, wherein the improvement comprises the steps of: (a) separating said crystals from said crystal slurry by continuous filtration, whereby said slurry is separated into a fraction containing a required size of crystal grain and into a fraction of mother liquor containing crystals of a grain size less than that said required size; (b) continuously mixing the mother liquor from step (a) with fresh solution containing dissolved solids; (c) allowing the crystals from the mother liquor and the fresh solution to settle and form a mother phase and a mother liquor free of crystal content which is subsequently withdrawn; (d) cooling and simultaneously moving the mother phase formed in step (c) to increase crystallization thereof and for a crystal slurry; and (e) repeating steps (a) through (d) with the crystal slurry formed in step (c).

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