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Coating reclaim as wet-end filler in papermaking: substitution of virgin filler with coating effluent in coated fine paper
2002 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

In this thesis the possibility to reuse reclaimed clay (coating effluent) as base sheet filler has been studied. The work was carried out in the M-real paper mill in Sittingbourne, England. If proven successful to reuse the effluent in the process, it would be possible for the mill to shut its primary effluent plant. The remaining (fibrous) effluent would be pumped directly to biological treatment. In order to establish what effects the reclaim had on the process a series of trials were carried out on PM16. The trials made it clear that the current system wasn't suitable for the recovery of coating solids. The pressure screen, which was there to remove dirt and lumps of clay, proved to be the weakest link. The screen kept getting blocked up, resulting in very poor runnability of the reclaim system. According to the supplier the screen couldn't cope with the flocculated feed. As longer trials were required, unscreened reclaim was used on a few occasions on PM16. From these longer trials, reclaim was seen to have had little or no impact on paper quality and PM runnability. The wet-end chemistry seemed slightly more affected. Due to the risks of contaminating the paper, an alternative solution had to be found if reclaim was to be used continuously. One option was to disperse the reclaim before introducing it to the paper machines. For this purpose the Atrex dispersion system was on trial for a week (on PM15). The trial was successful and shortly after the trial it was decided to invest in the Atrex dispersion system. Two centrifugal cleaners were included in the investment, enabling the reclaim to be used on both PM15 and PM16. The plan is to shut the primary effluent plant as soon as the Atrex is up and running.

Place, publisher, year, edition, pages
Keyword [en]
Technology, chemistry, papermaking, wet-end, coating, effluent, sludge, reclaim, clay, fillers, dispersion, Atrex
Keyword [sv]
URN: urn:nbn:se:ltu:diva-57477ISRN: LTU-EX--02/261--SELocal ID: e23aecab-0c6b-4f24-a1be-8179e2ff0178OAI: diva2:1030864
Subject / course
Student thesis, at least 30 credits
Educational program
Chemical Engineering, master's level
Validerat; 20101217 (root)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved

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