Bleach plant filtrate recovery

Details Bleach plant filtrate recovery Bleach plant filtrate recovery

D - Textiles, Paper

21

C

9/2

D21C 3/00 (2006.01) D21C 11/00 (2006.01)

Patent

CA 1070908

ABSTRACT OF THE DISCLOSURE Acid and alkaline filtrates are separated from the bleach plant of a bleached pulp mill for use in washing unbleached pulp free from entrained pulping liquor. Acid effluent is neutralized with sodium hydroxide solution prior to use in the washing as the last washing step while alkaline filtrate is used in the remainder of the washing. Part of both the acid and alkaline filtrates are not used in the washing to allow bleed of calcium value and caustic extraction stage solids which otherwise would build up on the washed pulp mat passing to the bleach plant.

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