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Optimum ink removal by the process steps flotation and disperging

Description: Das Projekt "Optimum ink removal by the process steps flotation and disperging" wird vom Umweltbundesamt gefördert und von Papiertechnische Stiftung München durchgeführt. A full understanding of the property potential of higher-quality graphic recovered paper grades as a function of the process technology used was to be supplied by the research project. It was studying how the combined processes of defibration / flotation and flotation / dispersion can be organized so as to achieve optimum ink detachment and removal. In conclusion, findings are expected on stock preparation concepts as a function of the composition of the recovered paper. The property potential of higher-quality graphic paper grades was shown as a function of the process technology used. Pilot-scale studies on the process combination of defibration, flotation and dispersion were carried out according to a defined flow diagram, using two wood-containing and two wood-free recovered paper grades. The factors varied in the studies were basically the flotation time and the conditions and circuitry of dispersion. The studied wood-free grades showed high initial brightness, which could only slightly be improved by flotation. Optical cleanliness is impaired by dirt specks. The treatment process must therefore be designed such that especially dirt specks are reduced effectively. Efficient dirt specks reduction, especially of large, optically disruptive dirt specks, is achieved by dispersion. The results obtained for these grades suggest that it is not necessary to use a flotation stage prior to disperging. A flotation stage after dispersion, however, is considered necessary to effectively remove even the comminuted or crushed ink particles. Only inferior optical properties can be expected with wood-containing recovered paper grades owing to their lower initial brightness values. The results obtained indicate that pre-flotation is necessary for optimum ink removal in these grades. Residual inks are detached and fragmentised by a dispersion stage after pre-flotation. Insufficient ink removal by pre-flotation and therefore higher residual ink contents in the disperger stage result in high ink fragmentation and reduced ink removal by post-flotation.

Types:

SupportProgram

Origin: /Bund/UBA/UFORDAT

Tags: Papierrecycling ? München ? Abfallbehandlung ? Abwasserreinigung ? Altpapier ? Druckfarbe ? Aufbereitungstechnik ? Industrieabwasser ? Papier ? Verfahrenskombination ? Verfahrensparameter ? Holz ? Abfallzusammensetzung ? Dispersion ? Flotation ? Gütekriterien ? Reinigungsleistung ? Stoffgemisch ? Studie ? Verfahrenstechnik ? Vergleichsanalyse ? Forschungsprojekt ? Partikel ? Rückstand ? Maßstabsvergrößerung ? Schadstoffelimination ? Vorbehandlung ? Zerkleinerung ?

Region: Bayern

Bounding box: 12.53381° .. 12.53381° x 47.795° .. 47.795°

License: cc-by-nc-nd/4.0

Language: Deutsch

Organisations

Time ranges: 2006-05-01 - 2008-04-30

Alternatives

Status

Quality score

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