D - Textiles – Paper – 21 – C
Patent
D - Textiles, Paper
21
C
D21C 5/02 (2006.01) B01D 19/02 (2006.01) D21B 1/32 (2006.01)
Patent
CA 2046195
22 ABSTRACT Foam typically forms in a receiving tank from either the underflow or overflow from a gas sparged hydrocyclone. Particularly in processing of paper pulp to deink the pulp or to remove sticky contaminants from it, the foam in the receiving tank has many undesirable materials which are preferably removed. Foam from the receiving tank is removed with a vacuum box or an overflow weir. To facilitate concentration of the foam, the discharge of fluent material from the bottom of the receiving tank is preferably via a tangential discharge line so that a swirling action takes place in the tank and the foam collects near the cylindrical side wall of the tank. The foam may be removed by vacuum caused by a blower, and the foam and entrained liquid is separated from the air before the air reaches the blower. The foam and entrained liquid may be dewatered, or compounds therein having a high BOD and COD load are separated. An alternative construction of receiving tank includes a gas introduction device at one side portion causing gas to blow foam toward an opposite side portion to a foam outlet, with a liquid spray for breaking foam bubbles at the outlet. A generally horizontal baffle, and optional vertical baffles, prevent short circuiting of fluent material from an inlet to the fluent material outlet of the tank.
Chamblee Wayne J.
Greenwood Brian F.
Torregrossa Louis O.
Bereskin & Parr
Chamblee Wayne J.
Greenwood Brian F.
Kamyr Inc.
Torregrossa Louis O.
LandOfFree
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