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Activation of sphalerite by lead in the presence of ethyl xanthate was investigated by microflotation, EDTA extraction, and X-ray photoelectron spectroscopy (XPS). Activation was significant below pH 7 and declined to zero at pH 11. Interactions in the sphalerite/lead/xanthate system to account for the response are proposed. Flotation as a function of surface concentration of Pb, [Pb] su...
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