Method for improving the washing of cellulose pulps

Details Method for improving the washing of cellulose pulps Method for improving the washing of cellulose pulps

D - Textiles, Paper

21

C

92/60

D21C 9/02 (2006.01) D21D 1/40 (2006.01)

Patent

CA 1164704

METHOD FOR IMPROVING THE WASHING OF CELLULOSE PULPS ABSTRACT OF THE DISCLOSURE An improved method is provided for washing cellulose pulps, which enables more chemicals and more combustible organic material to be recovered from the waste washing liquors, washing the chemically cooked and optionally mechanically defibrated pulp suspension in a plurality of stages while supplying water; subjecting the pulp to at least one mild mechanical treatment between twin interdigitated rotating screws in between two or more washing stages, after the pulp has been partially washed, thereby obtaining a pulp having a lower extractives content and Kappa number, and improved dewatering properties, and a washing effluent containing less contaminants.

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