Abstract
It was found that calcium carbonate particles dispersed in aqueous medium with sodium oleate were agglomerated spherically by adding and agitating a small amount of organophilic liquid, termed bridging liquid, e.g. benzene, kerosene and amyl acetate, whereas the agglomeration was not accomplished in the system without sodium oleate. This phenomenon was explained by the preferential wetting of the sodium oleate-treated calcium carbonate by the bridging liquid. Sodium oleate concentration in the medium determined the settling velocity and the sedimentation volume of agglomerates or flocs of calcium carbonate. The size distribution of agglomerates was dependent on both the concentration of sodium oleate and the type of bridging liquid used. The residual concentration of calcium carbonate particles in the supernatant separated from the system was also controlled by the above two factors.
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