Sawdust pumping, and processing

Details Sawdust pumping, and processing Sawdust pumping, and processing

D - Textiles, Paper

21

C

9/2, 92/57

D21C 7/06 (2006.01) D21C 3/22 (2006.01)

Patent

CA 1242055

SAWDUST PUMPING AND PROCESSING ABSTRACT OF THE DISCLOSURE A method and apparatus are provided for effecting treatment of sawdust to produce paper pulp in a simplified and efficient manner. The sawdust is entrained with liquid so that it forms a slurry having a consistency of between about 10-25%, and preferably between about 15-22% solids. The slurry consistency is maintained generally constant throughout the treatment process. The slurry at that consistency is pumped by a fluidizing, high speed, degassing, centrifugal pump (22). The pumping action alone provides for transport of the slurry to a digester vessel (26, 40, 46). The digester vessel may be an upflow vessel (26, 46), a hydraulically filled downflow vessel (40), or a superatmospheric vapor phase downflow vessel (40). Kraft pulping may be practiced in the digester, or a sulfite process may be practiced in the digester (46) and the slurry then passed to a refiner (48) to produce a mechanical pulp. Between the pump and the digester the slurry passes through a heating device (24, 30), which may comprise a fluidizing mixer (24) for directly introducing high pressure steam into the slurry, or a pressure diffuser (30) for effecting indirect heating of the slurry.

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