Abstract
Anionic and cationic flotation of a Stillwater Complex chromite was studied as a function of pH and various pretreatments of the mineral. Aging the ground mineral in air markedly decreased anionic (sodium dodecylsulfate) flotation below pH3 and enhanced it above pH 4–5. Such aging increased cationic (dodecylammonium chloride) flotation in the basic pH region. Mildly preheating the mineral enhanced anionic flotation. Increased conditioning time in collector solution decreased anionic flotation. Strongly acid pretreating the mineral caused it to behave like a simple charged oxide toward both anionic and cationic flotation. These phenomena appear to be related to the effect of aging on the amounts of Fe(II) and Fe(III), of Cr(III) and Cr(VI) and of Mg(II) on the mineral's surface.
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