Abstract
The flotation of celestite (SrSO 4) with the anionic collector sodium dodecyl sulfate has been investigated in solutions with and without carbonate species through electrokinetic and microflotation studies. The surface transformation of celestite to strontium carbonate in aqueous carbonate solutions has been studied through electrokinetics, mineral dissolution, IR spectroscopy and mineral/solution equilibria. Celestite is effectively floated with dodecyl sulfate in solutions free of carbonate species in the pH range of 3–11 due to collector chemisorption. Strontium dodecyl sulfate is formed on the celestite surface. Aqueous carbonate species convert the surface of celestite to strontium carbonate at pH 7.8 without affecting flotation at the onset of transformation. The flotation of celestite is depressed only above pH 10, due to the specific adsorption of HCO 3 − and CO 3 2− species that inhibit the adsorption of dodecyl sulfate on the carbonated surface of celestite.
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