Abstract
In a recent paper (3) an example of what appears to be selective coagulation (as distinct from selective flocculation by polymers (4)) was reported. As that investigation was purely empirical, the potentialities of selective coagulation have now been considered theoretically on the basis of the Derjaguin-Landau-Verwey-Overbeek theory of colloid stability. Computed stability curves indicate that a very wide range of coagulation rates is possible. Consequently, in favorable cases separations should be possible by chemical control of the surface potentials of the different species present. The influence of particle size distribution can be taken into account.
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