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Iron, Manganese and Copper Equilibria with Wood Fibres in Single Salt Aqueous Suspensions

Authors

  • Robin Susilo,

    1. Department of Chemical and Biological Engineering and Pulp and Paper Centre, The University of British Columbia, 2216 Main Mall, Vancouver, BC, Canada V6T 1Z4
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  • Rajeev Chandraghatgi,

    1. Department of Chemical and Biological Engineering and Pulp and Paper Centre, The University of British Columbia, 2216 Main Mall, Vancouver, BC, Canada V6T 1Z4
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  • Xiao-Sen Li,

    1. Department of Chemical and Biological Engineering and Pulp and Paper Centre, The University of British Columbia, 2216 Main Mall, Vancouver, BC, Canada V6T 1Z4
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  • Peter Englezos

    Corresponding author
    1. Department of Chemical and Biological Engineering and Pulp and Paper Centre, The University of British Columbia, 2216 Main Mall, Vancouver, BC, Canada V6T 1Z4
    • Department of Chemical and Biological Engineering and Pulp and Paper Centre, The University of British Columbia, 2216 Main Mall, Vancouver, BC, Canada V6T 1Z4
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Abstract

Ions of Fe, Mn and Cu were introduced into suspensions of protonated or metal-free fibres and the equilibrium concentration of each metal in the fibre and surrounding solution was measured. The results were compared with the Donnan equilibrium model. Mn and Cu concentrations on the fibres were found to be pH dependent and in agreement with the model. An increased amount of Fe on the Kraft pulp fibres was found and attributed to iron containing precipitates trapped within the fibres. Precipitates in mechanical pulps had a very small amount (1-2 wt%) of iron.

Abstract

Des ions de Fe, Mn et Cu ont été introduits dans des suspensions de fibres protonatées ou « sans métaux » et la concentration d'équilibre de chaque métal dans la fibre et la solution environnante a été mesurée. Les résultats ont été comparés avec le modèle d'équilibre de Donnan. On a trouvé que les concentrations de Mn et Cu sur les fibres étaient dépendantes du pH et en accord avec le modèle. Une quantité accrue de Fe a été trouvée sur les fibres de pâte kraft et attribuée aux précipitats contenant du fer retenus dans les fibres. Les précipitats dans les pâtes mécaniques ont une très petite quantité (1-2% en poids) de fer.

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