Flotation process for deinking printed waste paper

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

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162 8, D21C 502

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active

049716565

ABSTRACT:
A flotation process for the de-inking of printed waste-paper by treating the paper pulp in the pulper at alkaline pH-values by means of alkali silicate, oxidative bleaches and separating the loosened printing-ink particles from the fibrous material suspension by flotation, in which protein fatty acid condensates are added finely distributed, possibly together with dispersing agents, in a solution or dispersion which is fluid at normal temperature.

REFERENCES:
patent: 2116511 (1938-05-01), Earle
patent: 3354027 (1967-11-01), Hossain
patent: 3846227 (1974-11-01), Mestetsky
patent: 3963560 (1976-06-01), Mestetsky
patent: 4043908 (1977-08-01), Roberts
patent: 4231841 (1980-11-01), Calmanti
patent: 4360439 (1982-11-01), Calmanti
patent: 4487655 (1984-12-01), Noetzel
patent: 4586982 (1986-05-01), Poppel
Tappi, "Deinking of Secondary Fibers", Sep., 1980, vol. 63, No. 9, pp. 1, 113-116.
Ullmanns Encyklopadie der technischen Chemie, Band 17, pp. 1, 570-572.

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