METHOD FOR SUPPLYING CELLULOSE FIBER MATERIAL TO TREATING TANK

PROBLEM TO BE SOLVED: To provide an apparatus and a method for supplying a slurry of a wood chip-like ground cellulose fibrous material to the top part of a continuous cooker-like treating tank. SOLUTION: A cellulose material is treated to remove metals before digesting. In transporting the slurry b...

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Format: Patent
Sprache:eng
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Zusammenfassung:PROBLEM TO BE SOLVED: To provide an apparatus and a method for supplying a slurry of a wood chip-like ground cellulose fibrous material to the top part of a continuous cooker-like treating tank. SOLUTION: A cellulose material is treated to remove metals before digesting. In transporting the slurry by using at least a first and a second pumps 251 and 251' in series, an agent (acid and/or chelating agent) to dissolve metals in the slurry is added to a part of at least one pump 251 or 251' or its upper stream, preferably a liquid is taken out in a certain degree and at least about 10% (e.g. about 20-80%) of the metals existing in the cellulose material is purged. Preferably, the removal of the metals is carried out substantially immediately before alkali digestion.