B - Operations – Transporting – 01 – D
Patent
B - Operations, Transporting
01
D
B01D 19/00 (2006.01) D21C 9/147 (2006.01) D21C 9/153 (2006.01) D21D 5/26 (2006.01)
Patent
CA 2054727
2054727 9013344 PCTABS00002 The present invention relates to a method of and an apparatus for treating pulp. The apparatus according to the present invention is especially suitable for carrying out bleaching processes of the wood processing industry and for separation of residual gases remaining in the suspension in the processes. The method of the present invention is characterized in that pulp at the consistency range of 8 to 20 % is subjected to at least the following treatment steps in a closed pressurized process: feeding pulp with a pump to a chemical mixer; mixing chemicals with the pulp; introducing the pulp flow by means of the pressure of the pump to a process vessel; treating the pulp with chemicals in the process vessel; removing gases from the pulp in connection with the process vessel or after it in a closed pressurized separator; in the gas separation, preventing fibers from exiting with the gas; and guiding the pulp via a closed path to a following process step. The apparatus according to the present invention is in turn characterized in that the rotor (10) preferably comprises a rotationally symmetric shell (110) which is centrally mounted on a flange (20) disposed substantially perpendicular to the shaft (12) of the rotor (10), and the end of which adjacent to the flange (20) has openings (112) for removal of the gas-free suspension towards the outlet (58).
Henricson Kaj
Niskanen Tolvo
Ahlstrom (a.) Corporation
Bereskin & Parr
Henricson Kaj
Niskanen Tolvo
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