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Influence of surface charge on interaction forces in soluble salt flotation systems as determined by atomic force microscopy

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Abstract

The recent nonequilibrium electrophoretic mobility measurements by laser-Doppler electrophoresis coupled with the stability and prevalence of collector colloids in soluble-salt flotation systems suggest that the selective flotation of alkali halides is due to the adsorption of oppositely charged collector colloids by heterocoagulation. Previously reported flotation results confirm this surface charge/collector colloid adsorption model. These results also indicate that the sign of the surface charge has a significant effect on the extent of particle dispersion/aggregation. In this regard, the nature of such particle interaction forces at high ionic strengths are examined to improve our understanding of these systems. Atomic force microscopy (AFM) is now being used to directly measure the interaction forces responsible for the stability of these alkali halide aggregates observed in optical microscopy studies. Results from this study indicate that, while repulsive hydration forces exist between similarly charged hydrophilic particles, attractive forces exist between oppositely charged hydrophilic particles in high ionic strength solutions.

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Authors and Affiliations

  1. Department of Metallurgical Engineering, University of Utah, Salt Lake City, UT, USA

    S. Veeramasuneni (member SME, graduate student)

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  1. S. Veeramasuneni
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Nonmeeting paper 97-302 — winner of the 1996 SME outstanding student paper contest in the graduate division.

Discussion of this peer-reviewed and approved paper is invited and must be submitted to SME prior to May 31, 1998.

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Veeramasuneni, S. Influence of surface charge on interaction forces in soluble salt flotation systems as determined by atomic force microscopy. Mining, Metallurgy & Exploration 15, 35–40 (1998). https://doi.org/10.1007/BF03402784

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  • DOI: https://doi.org/10.1007/BF03402784

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