It is established that the optimal conditions for flotation of fluorite are characterized by zero charge of the mineral surface. Maximal hydrophobization of the surface is achieved in this case and physical sorption of the collector becomes possible. It is shown that the pH value for the pulp which satisfies the requirements for a zero charge potential on the mineral surface can be determined from a thermodynamic analysis of an isolated mineral - solution system. The functional mechanism of such modifiers as liquid glass and tribasic sodium phosphate are determined by varying the composition of the fluorite surface, assuming a given rate of consumption of reactants. A reduced degree of mineral flotability is determined by the correspondence between the fluorite crystal lattice parameters and the parameters of the calcium salts that form on the mineral surface. The correspondence also determines how well defined is the sorption layer in the modifiers.
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