D - Textiles – Paper – 21 – C
Patent
D - Textiles, Paper
21
C
92/53, 8/78
D21C 7/00 (2006.01) D21B 1/16 (2006.01) D21C 9/10 (2006.01)
Patent
CA 1074608
ABSTRACT OF THE DISCLOSURE A process is provided for preparing groundwood pulp from debarked pulpwood logs, which comprises grinding the logs under a superatmospheric pressure of a gas selected from the group consisting of steam, air, and steam and air, while continuously supplying thereto water comprising spent bleaching liquor at a temperature of at least 70°C and forming a pulp suspension in the resulting aqueous liquor; centrifugally separating steam from the pulp suspension and using the separated hot steam to heat spent bleaching liquor supplied for the grinding; thickening the pulp suspension to a concentration within the range from about 5 to about 40% and supplying water separated therefrom to the grinding; diluting the pulp suspension to a concentration within the range from about 0.5 to about 4.0%; screening the pulp suspension; thickening the pulp suspension to a concentration within the range from about 10 to about 50% and supplying water separated therefrom to the screening; adding bleaching chemicals to the pulp and bleaching the pulp; diluting the bleached pulp with spent bleaching liquor to a concentration within the range from about 1 to about 6%; thickening the bleached pulp suspension to a concentration within the range from about 10 to about 50% and separating, heating and recycling to the grinding spent bleaching liquor containing residual bleaching chemicals.
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