The interaction among multiple charged particles induced by cations and direct force measurements by AFM

The interaction among multiple charged particles in flotation system was subjected to detailed analysis using different techniques. To limit the detrimental effect of serpentine on ascharite flotation, an innovative method was used through particles interaction. It stated that serpentine took priority to absorb on quartz surface to prevent from attaching to ascharite surface. Interaction forces among multiple charged particles were measured by AFM, the findings that attractive force between ascharite and serpentine could be prominently reduced by cations (Cu2+ > Ca2+> Mg2+) were unveiled, revealing cations could motivate the separation process, but it didn't work due to the presence of quartz. In this case, Zeta potential analysis and DLVO theory were used to study the inner factor affecting particles interaction. The result showed that cations was of benefit to the particles dispersion and the surface potential was confirmed to contribute most to the difference in forces.