VERFAHREN ZUR ENTFÄRBUNG VON ALTPAPIER DURCH FLOTATIONS-DEINKEN

VERFAHREN ZUR ENTFÄRBUNG VON ALTPAPIER DURCH FLOTATIONS-DEINKEN

Continuous flotation deinking of waste paper under alkaline conditions may not satisfactorily remove hydrophilic and water-soluble printing inks. The invention solves that problem by a two-stage flotation method. An alkaline flotation step is immediately followed by a flotation step in the neutral t...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: SUESS, HANS, GRIMMER, RALF
Format: Patent
Sprache:ger
Schlagworte:
APPARATUS THEREFOR
PAPER-MAKING
PRODUCTION OF CELLULOSE
PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCESFROM CELLULOSE-CONTAINING MATERIALS
REGENERATION OF PULPING LIQUORS
TEXTILES
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Beschreibung
Zusammenfassung:Continuous flotation deinking of waste paper under alkaline conditions may not satisfactorily remove hydrophilic and water-soluble printing inks. The invention solves that problem by a two-stage flotation method. An alkaline flotation step is immediately followed by a flotation step in the neutral to weakly acid pH range, the pH value being lowered at the beginning of the second flotation step to a pH value in the range of from 5 to 7.5 using carbon dioxide.