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Eriksson, G. och Grén, U. (1996) *Pulp washing: Sorption equilibria of metal ions on kraft pulps*.

** BibTeX **

@article{

Eriksson1996,

author={Eriksson, Gunnar and Grén, Urban},

title={Pulp washing: Sorption equilibria of metal ions on kraft pulps},

journal={Nordic Pulp & Paper Research Journal},

volume={11},

issue={3},

pages={164-170},

abstract={A kraft pulp mill with a high degree of system closure has an increased accumulation of trace elements, and since the alternative bleaching methods used, such as peroxide and ozone bleaching, are sensitive to transition metals, there is a need for more efficient separation operations. An important aspect to establish is the influence of metal ion equilibria in pulp washing. In this investigation, the sorption equilibria of Na<sup>+</sup>, Mg<sup>2+</sup>, Ca<sup>2+</sup> and Mn<sup>2+</sup> were studied, both for each ion and for combinations of ions, including temperature dependence, at a constant pH and with no chelant added. It was found that the Langmuir isotherm gave a good correlation of the sorption of single ions. A model for the multi-ion sorption, based on the Langmuir model, was found to give an acceptable correlation. The ion charge was accounted for in different ways in the summation of the concentration: linear dependence on the charge in the liquor and no dependence in the fibre gave the best correlation, although the more plausible case with quadratic dependence in the liquor and linear in the fibre was nearly as good. The separation factor, the quota between two ion equilibrium ratios, showed that Na<sup>+</sup> had a weaker bond to the fibres than Mg<sup>2+</sup> and Ca<sup>2+</sup>, and that Mn<sup>2+</sup> bound more strongly than Mg<sup>2+</sup>. A slight temperature dependence of the equilibria was observed.},

year={1996},

keywords={Pulp washing, Sorption, Metal ions, Kraft pulp, Fibres},

}

** RefWorks **

RT Journal Article

SR Print

ID 20893

A1 Eriksson, Gunnar

A1 Grén, Urban

T1 Pulp washing: Sorption equilibria of metal ions on kraft pulps

YR 1996

JF Nordic Pulp & Paper Research Journal

VO 11

IS 3

SP 164

OP 170

AB A kraft pulp mill with a high degree of system closure has an increased accumulation of trace elements, and since the alternative bleaching methods used, such as peroxide and ozone bleaching, are sensitive to transition metals, there is a need for more efficient separation operations. An important aspect to establish is the influence of metal ion equilibria in pulp washing. In this investigation, the sorption equilibria of Na<sup>+</sup>, Mg<sup>2+</sup>, Ca<sup>2+</sup> and Mn<sup>2+</sup> were studied, both for each ion and for combinations of ions, including temperature dependence, at a constant pH and with no chelant added. It was found that the Langmuir isotherm gave a good correlation of the sorption of single ions. A model for the multi-ion sorption, based on the Langmuir model, was found to give an acceptable correlation. The ion charge was accounted for in different ways in the summation of the concentration: linear dependence on the charge in the liquor and no dependence in the fibre gave the best correlation, although the more plausible case with quadratic dependence in the liquor and linear in the fibre was nearly as good. The separation factor, the quota between two ion equilibrium ratios, showed that Na<sup>+</sup> had a weaker bond to the fibres than Mg<sup>2+</sup> and Ca<sup>2+</sup>, and that Mn<sup>2+</sup> bound more strongly than Mg<sup>2+</sup>. A slight temperature dependence of the equilibria was observed.

LA eng

OL 30