Flotation process for mechanical pulp using a surface active age

Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – Chemical treatment after start or completion of mechanical...

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162 55, 162 74, 162 78, D21C 100, D21C 916

Patent

active

055542581

ABSTRACT:
An improved process for bleaching pulps is disclosed in which the unbleached pulp is subject to flotation before bleaching and, if necessary, the circulating water is also purified of interfering compounds by flotation.

REFERENCES:
patent: 3856788 (1974-12-01), Corbett et al.
patent: 5225046 (1993-07-01), Borchardt et al.
patent: 5228953 (1993-01-01), Bast et al.
patent: 5273624 (1993-12-01), Chamberlain et al.
Strunk, "Factors affecting hydrogen peroxide bleaching for high-brightness TMP", Pulp & Paper, Jun. 1980, 162-78.
Rydholm, Pulping Processes, Interscience Publishers, New York, Sep. 1967; p. 357.

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