Abstract
Salt-type minerals dispersed in aqueous solution with sodium oleate were spherically agglomerated at the critical surfactant concentration. When the pH range corresponded to the pH PZC of carbonate minerals, the spherical agglomeration disappeared. The selective separation of barite from a carbonate mineral suspension (ratio 1:1) was realized when sodium lignin sulphonate was added using the spherical agglomeration procedure. The effect of adding sodium lignin sulphonate was analyzed using FT-IR spectroscopy and thin-layer wicking techniques. The results suggest that the addition of the modifier changes the hydrophobicity of the surface and probably prevents the adhesion of bulk precipitated surfactant salts to the carbonate mineral surfaces.
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