Method of processing waste paper

Details Method of processing waste paper Method of processing waste paper

D - Textiles, Paper

21

C

9/1

D21C 5/02 (2006.01) D21C 11/00 (2006.01) D21H 11/14 (2006.01) D21H 17/66 (2006.01)

Patent

CA 1275757

ABSTRACT OF THE DISCLOSURE Waste paper with a high lignin content is pretreated and thereafter delignified with oxygen. Prior to the oxygen step, the pulp is dewatered whereby the main part of the white water containing dissolved aluminium is used directly as dilution liquid in a subsequent paper mill. After the oxygen step the pulp is washed and dewatered whereby the white water substantially free of aluminium is led off to evaporation and chemical recovery.

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