Effect of particle properties and solution environment on the detachment behavior between particle and bubble

The detachment between bubbles and particles is one of the key sub⁃processes of bubble⁃particle mineraliza⁃ tion in flotation，which determines the final efficiency and the upper limit of the particle size of flotation.However，the influence mechanism of the detachment behavior between particles and bubbles is not clear so far.To systematically ex⁃ plore the effects of particle properties and solution environment on the detachment behavior between particle and bub⁃ ble，the test system of bubble⁃particle attachment and detachment，and the adhesion force measurement system were used. The detachment force between particles and bubbles and the stability of the aggregate were distinguished by the maximum detachment force between particle bubbles and the critical detachment amplitude of the aggregate.The results show that the detachment force between particles and bubbles increases with the increase of particle size through increasing the circumference of three⁃phase contact line， while the stability of the aggregate reduces due to the higher inertia，which is not conducive to flotation on the whole.The detachment force between parti⁃ cle and bubble and the stability of the aggregate increase with the increase of surface particle hydrophobicity due to the longer three⁃phase contact line. The roughness of the hydrophobic surface improves the hydrophobicity of the particle，thus the detachment force and the stability of the aggregate increase accordingly. The particle shape changes the circumference of the three⁃phase contact line and the distribution of contact angles on the three⁃phase con⁃ tact line.Meanwhile，the contact angle at the edge of the upper surface of columnar particles takes a range of values within the limits defined by the Gibbs inequality，the detachment behavior between particle and bubble is influence by them.In general，the detachment force of particle with different shape decreased gradually in the order of cylinder， quadruplex and sphere.The detachment force tested in a quasi⁃static environment is determined by the surface tension while the solution viscosity has almost no effect，but the stability of the aggregate is affected by the surface tension and viscosity.