Method of removing fine contaminants from used paper fibre mater

Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – Waste paper or textile waste

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162 28, 162 55, 162 60, 162261, 209164, 209165, 209168, 209169, 210173, 210259, 210294, 210322, 210703, D21B 132

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active

054178061

ABSTRACT:
A method of removing fine contaminants from waste paper fibrous material (S) is described with solution (1) and pre cleaning (2) whereupon the fibrous material is first subjected to a washing treatment (3) and then to a flotation treatment (5). The washing filtrate (12) from the washing treatment (3) is cleaned in a filtrate-flotation treatment (4) so that a cleaned fraction (14) can be returned into the useful material (13) of the washing treatment. The so cleaned waste paper fibrous material can be passed to further treatment steps such as flotation, bleaching and/or dispersion. The reject material from the filtrate-flotation (4) is, in one embodiment, again subjected to a flotation treatment.

REFERENCES:
patent: 4331534 (1982-05-01), Barnscheidt
patent: 4332638 (1982-06-01), Mauer et al.
patent: 4865690 (1989-09-01), Bernard et al.
Pfalzer, "Deinking of Secondary Fibers A Comparison of Washing and Flotation," TAPPI (Sep. 1980) vol. 63 No. 9, pp. 113-116.

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