A Noncoulombic Model for Adsorbing Colloid Flotation

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Abstract
A model for floc foam flotation is examined in which the driving force for bubble attachment to a floc particle derives from a nonzero contact angle of the air–water interface with the solid surface. Binding energies are calculated and found to be sufficient to overcome random thermal forces and also the viscous drag forces occurring in wet foams in stripping columns. Adsorption isotherms of floc particles at the air–water interface are calculated; a Langmuir isotherm is found to be an excellent approximation in most cases.