Method of removing fine contaminants from used paper fibre material
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United States of America Patent
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-
May 23, 1995
Grant Date -
N/A
app pub date -
Oct 19, 1992
filing date -
Oct 19, 1991
priority date (Note) -
Expired
status (Latency Note)
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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.
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Cited Art Landscape
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