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Filler co-flocculation with MFC: Novel predictive method
RISE - Research Institutes of Sweden, Bioeconomy, Papermaking and Packaging.
RISE - Research Institutes of Sweden, Bioeconomy, Papermaking and Packaging.
RISE - Research Institutes of Sweden, Bioeconomy, Papermaking and Packaging.
2019 (English)In: PaperCon 2019: Proceedings, TAPPI Press, 2019, article id PA2-PF1.2Conference paper, Published paper (Other academic)
Abstract [en]

Research has been undertaken in which a combination of different techniques was utilised to compare pre-flocculation (flocculant added to the filler prior to its addition to the pulp) with pre-mixing strategies, also called co-flocculation (chemicals added to a mixture of cellulose microfibrils (CMF) and filler. The pulp used was a mixture of 80% hardwood kraft pulp and 20% softwood kraft pulp. The filler was ground calcium carbonate (GCC), while the chemicals used included cationic polyacrylamide (CPAM), silica, bentonite, anionic PAM (APAM), cationic starch and CMF. Using the focused beam reflectance method (FBRM) enabled an in-depth and quick study of the filler floc behaviour at different dosages and mixing conditions, demonstrating that it was a very good tool as a pre-screening for different treatment alternatives. Clear differences in behaviour between different pre-flocculation and pre-mixing strategies were observed. For the pre-mixing strategy, the most promising results were achieved with CPAM plus bentonite and cationic starch systems. Although dewatering was negatively affected with pre-mixing, the mechanical properties were clearly improved. Flocs obtained with PCAM/bentonite had a similar resistance with both strategies, while cationic starch was clearly more advantageous when using the pre-mixing strategy.

Place, publisher, year, edition, pages
TAPPI Press, 2019. article id PA2-PF1.2
Keywords [en]
filler; flocculation; microfibrillated cellulose; anionic polyacrylamide; cationic polyacrylamide; bentonite; silica; stock preparation
National Category
Paper, Pulp and Fiber Technology
Identifiers
URN: urn:nbn:se:ri:diva-40587OAI: oai:DiVA.org:ri-40587DiVA, id: diva2:1366265
Conference
PaperCon 2019. Proceedings of a conference held in Indianapolis, Indiana, USA, 5-8 May 2019
Available from: 2019-10-28 Created: 2019-10-28 Last updated: 2019-10-31Bibliographically approved

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CiteExportLink to record
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