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Flotability and electrokinetic potential of insoluble salt-type minerals in solutions of indifferent electrolytes

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Conclusions

This study showed that at sufficiently long adsorption times the adsorption of anionic surfactant was not influenced by the change of ζ-potential at the insoluble salt-type mineral-water interface resulting from concentration changes of an indifferent electrolyte. Thus, this group of minerals differs in its behaviour from that where the adsorption of a surfactant is controlled by H+ or OH− as potential-determining ions. This finding further confirms conclusions of our previous studies on adsorption mechanism of anionic surfactants on the surface of insoluble salt-type minerals [10].

The effect of added indifferent electrolyte on the ζ-potential can be used for selective flotation of minerals with different character of potential-determining ions, e. g. H+ or OH− ions on one side and polyvalent lattice ions (Ca2+, Ba2+ etc.) on the other side (electrostatic adsorption — chemisorption).

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References

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Author notes

  1. H. Pohl & B. Dobiáš

    Present address: Institute of Physical and Macromolecular Chemistry, University of Regensburg, Regensburg, F.R.G.

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    1. H. Pohl
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    2. B. Dobiáš
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    Additional information

    Thanks are due to Miss. R. Plank from this Institute for the electrophoretic measurements.

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    Pohl, H., Dobiáš, B. Flotability and electrokinetic potential of insoluble salt-type minerals in solutions of indifferent electrolytes. Colloid & Polymer Sci 260, 815–817 (1982). https://doi.org/10.1007/BF01452076

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    • DOI: https://doi.org/10.1007/BF01452076

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