Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – With agitation or forced circulation
Patent
1992-02-28
1993-11-02
Jones, W. Gary
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
With agitation or forced circulation
162243, D21C 300
Patent
active
052581004
ABSTRACT:
A method and mixer are provided for mixing chemical (such as a gas like chlorine or oxygen) with a slurry (such as paper pulp having a consistency of about 1-16%) in such a way that separation of gas from the slurry at the discharge from the mixer is avoided. Where the mixer housing has a radial discharge, the leading and trailing walls of the discharge (in the direction of circular and tangential movement of slurry within the main body housing of the mixer) present curved configurations to transition the slurry from circular/tangential movement to radial movement. The curvature of the configurations (which may be provided by inserts) does not exceed an angle of about 10 degrees at any point along them until radial flow is established. Alternatively, the discharge may allow the tangential movement of the pulp in the main housing to continue by cutting off the original radial pulp discharge outlet, and welding or otherwise attaching a retrofit new discharge outlet to the main housing body similar to a pump volute with a gradually increasing cross-section.
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International Technology Disclosure, vol. 1 No. 9 (Jul. 25, 1983) pp. 3-4.
Berry, R., "High-Intensity Mixers in Chlorination and Chlorine Dioxides Stages: Survey Results and Evaluation", Pulp and Paper Canada, vol. 91 No. 4 (1990), pp. T151-T160.
Brochure entitled "Kamyr Mc.RTM. Mixer", Jan. 1988.
Dunn Stephen J.
Greenwood Brian F.
Makela Mika P.
Niskanen Toivo
Peltonen Kari
Jones W. Gary
Kamyr Inc.
Lamb Brenda
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