B - Operations – Transporting – 04 – C
Patent
B - Operations, Transporting
04
C
209/85
B04C 5/10 (2006.01) D21D 5/24 (2006.01)
Patent
CA 1318282
Abstract The present invention relates to a method and apparatus for grading fiber suspension. The invention especially relates to so called cyclone separators, by means of which particles heavier than the fibers, such as sand and metal particles, are separated from the fiber suspension in the pulp and paper industry. Prior art apparatus problems include the wearing effect on the conical part caused by the heavier particles remaining rotating in the conical part and the acceptable fraction being allowed to the reject, which fraction the apparatuses of the prior art technique have not been able to return to the pulp circulation during the same separation stage and which thus fills the reject section, whereby the separation of the heavier particles also stops. The apparatus according to the invention is characterized in that the reject is removed from the cyclone separator (1) to a reject chamber (10), inside of which a rotor (11) rotates maintaining the pulp in movement and efficiently separating the acceptable pulp flowing into the reject chamber (10) from the heavier reject, whereby the acceptable material can be returned back to the pulp circulation along duct (12). Additionally, ribs may be provided on the walls of the reject chamber (10) to decelerate the rotational speed of the reject, in other words the heavier particles thrown against the wall of the reject chamber have their descent to the bottom of the reject chamber (10) facilitated thereby, from where they are discharged via a duct (14). (Fig. 1) P640/SK2WP
576185
A. Ahlstrom Corporation
Gowling Lafleur Henderson Llp
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