Oxygen reactor systems pulp reject treatment

Details Oxygen reactor systems pulp reject treatment Oxygen reactor systems pulp reject treatment

D - Textiles, Paper

21

C

92/57

D21C 9/10 (2006.01)

Patent

CA 1103504

OXYGEN REACTOR SYSTEMS PULP REJECT TREATMENT ABSTRACT OF THE DISCLOSURE A method and apparatus for the delignification of cellulosic fiber material to minimize the amount of reject material in the final pulp produced. The fiber material is digested, washed, oxygen delignified, and passed through a screening stage to provide a main pulp stream, and a reject stream from the separation stage. The flow and consistency of the separated reject mater- ial is determined, the reject material is refined, and sufficient chemical is added to the separated reject material, based upon the flow and consistency thereof, so that subsequent delignification of the reject mater- ial may be effected. This may be accomplished either by passing the reject material through a separate oxygen delignification stage and then returning it to the main pulp stream, or adding caustic to it and soaking it in a soak tank for predetermined period of time, and then returning it to the main pulp stream before the oxygen delignification stage therein.

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