Abstract
The aggregation of alumina suspensions (γ-alumina, boehmite and gibbsite) has been observed by light scattering as a function of the identity and concentration of added electrolyte, and of acidic pH. All the suspensions aggregated rapidly in the presence of less than 1 mM sulfate ion. The gibbsite suspension displayed a critical coagulation concentration of less than 50 mM chloride ion. The other three suspensions displayed anomalous stability in chloride solutions of concentrations greater than 0.1 M and only aggregated at higher chloride ion concentrations. This stability is not related to the pH and electrolyte dependence of the zeta potential.
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