Method for waste paper treatment

Details Method for waste paper treatment Method for waste paper treatment

D - Textiles, Paper

21

C

D21C 5/02 (2006.01) D21B 1/32 (2006.01)

Patent

CA 2100741

ABSTRACT OF THE DISCLOSURE The invention concerns a method for waste paper treatment with primary purification and a early, or primary, dewatering stage as a wash stage which largely separates printing inks from the branch circuit into a main circuit with adapted purification stage for the recycled water of the primary dewatering stage. The method is applied to a mixture containing waste paper im- printed with both hydrodispersible (hydrophilic) and other inks. Acid is selectively added to create an acid environment with a pH value between 6 and 7 in the circuit, up to the first primary dewatering stage. Base is selectively added to create an alkaline environment with a pH value between 9 and 11 in the treatment circuit downstream the primary de- watering stage. A dispersion stage is provided in the second circuit for the printing inks which are not hydrodispersible (hydrophobic). Additionally a stage of selective flotation is provided in the main circuit.

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