THE EFFECT OF CAPILLARY PRESSURE IN BUBBLES ON THEIR ADHESI ON TO PARTICLES DURING FOAM FLOTATION. PART 2

Calculation of the energy possibility of А spherical bubble transition into М captive bubble, i.e. А → М transition, has shown the great effect of capillary pressure (Рc) on the calculation results as well as that in reducing А and М bubbles and growing Рc in them, the range of possible РcМ change in М bubble is sharply confined and the effect of РcМ on the energy barrier along the path of the bubble adhesion to the hydrophilic surface drops practically to zero but the preference in bubble adhesion to the hydrophobic surface is kept constant, although the difference considerably drops compared with large bubbles. The practical data of the first processes of the foam flotation with microbubbles are the confirming experimental base of the results of this high-precision calculation. It is apparently, the adhesion process in practice is also promoted by θМ wetting angle reduction down to 0,02° and the beginning growth of spreading coefficient of the adhered bubble over the substrate-particle.

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