Innovative scheme for hemimorphite flotation: Synergistic activation performance and mechanism
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Graphical Abstract
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Abstract
Hemimorphite exhibits poor floatability during sulfidization flotation. Cu2+ and Pb2+ addition enhances the reactivity of the hemimorphite surface and subsequently improves its flotation behavior. In this study, the mechanisms of Cu2+ + Pb2+ adsorption onto a hemimorphite surface were investigated. We examined the interaction mechanism of xanthate with the hemimorphite surface and observed the changes in the mineral surface hydrophobicity after the synergistic activation with Cu2+ + Pb2+. Microflotation tests indicated that individual activation with Cu2+ or Pb2+ increased the flotation recovery of hemimorphite, with Pb2+ showing greater effectiveness than Cu2+. Meanwhile, synergistic activation with Cu2+ + Pb2+ considerably boosted the flotation recovery of hemimorphite. Cu2+ and Pb2+ were both adsorbed onto the hemimorphite surface, forming an adsorption layer containing Cu or Pb. Following the synergistic activation with Cu2+ + Pb2+, the activated layer on the hemimorphite surface consisted of Cu and Pb and a larger amount of the active product compared with the surface activated by Cu2+ or Pb2+ alone. In addition, xanthate adsorption on the hemimorphite surface increased noticeably after synergistic activation with Cu2+ + Pb2+, suggesting a vigorous reaction between xanthate and the activated minerals. Therefore, synergistic activation with Cu2+ + Pb2+ effectively increased the content of active products on the hemimorphite surface, thereby enhancing mineral surface reactivity, promoting collector adsorption, and improving surface hydrophobicity.
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