Dissolved and colloidal substances from a mechanical pulp suspension - Interactions influencing the sterical stability

J Nylund, Anna Sundberg, K Sundberg

    Research output: Contribution to journalArticleScientificpeer-review

    24 Citations (Scopus)

    Abstract

    The stability of colloidal material present in unbleached thermomechanical pulp suspension was studied by investigating the influence of simple electrolytes as a function of temperature and substrate concentration. The influence of competitive adsorption to kaolin was also studied. The results indicate that when the temperature is raised, a decrease in the stability of the suspension occurs. The stability was further decreased by addition of simple electrolytes as well as by decreasing the pH. When increasing the substrate concentration, the suspension seems to become less sensitive to electrolyte induced flocculation. This indicates that in concentrated suspensions the contribution of the sterical component of the stabilization mechanism is greater and that in diluted systems other stabilization mechanisms are also important. Adsorbed polymers are proposed to largely determine the surface properties of the lipophilic extractives. Kaolin was found to influence the stability of the lipophilic extractives resulting both in a decrease of the amount of lipophilic extractive droplets in the dispersion, as well as rendering the droplets sensitive to electrolyte induced aggregation. (C) 2007 Elsevier B.V. All rights reserved.
    Original languageUndefined/Unknown
    Pages (from-to)335–340
    Number of pages6
    JournalColloids and Surfaces A: Physicochemical and Engineering Aspects
    Volume301
    Issue number1-3
    DOIs
    Publication statusPublished - 2007
    MoE publication typeA1 Journal article-refereed

    Keywords

    • dissolved and colloidal substances
    • kaolin
    • mechanical pulp
    • steric stability
    • TMP

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