Flotation Separation Theory of Hydrophobic Malachite with a Novel Di-Minerophilic Group Surfactant Oxadiazole-Thione
Malachite,being a typical copper oxide mineral,readily forms a hydration layer with water during the flotation process,thereby enhancing its hydrophilicity.Achieving selective flotation separation using conventional collectors and proces-ses is challenging.A novel di-minerophilic group oxadiazole-thione collector,5-hexyldithiocarbamate-1,3,4-oxadiazole-2-thione(MHCODT),has been synthesized and designed in this paper.MHCODT can form a dual coordination active center with the malachite surface to enhance its flotation efficiency.The experiments of pure mineral and mixed mineral flotation showed that MHCODT exhibited better flotation selectivity for malachite against gangue quartz and calcite than octyl hydroxamic acid(OHA),and achieved the efficient flotation separation of malachite from its mixture with calcite or quartz.The results of ad-sorption experiments showed that MHCODT can be selectively adsorbed on malachite surface to achieve flotation enrichment of malachite.The DFT calculation further revealed that the dithiocarbamate and oxadiazole-thione moieties in MHCODT served as the active centers for the reaction.The Cu species on malachite surface can coordinate with S and N atoms of MHCODT to form a hydrophobic MHCODT-Cu complex,which realizes hydrophobic malachite and enrichment flotation.
di-minerophilic group surfactantmalchiteflotation separationadsorption mechanism
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