The flotation behavior and adsorption mechanism of O-isopropyl-S-[2-(hydroxyimino) propyl] dithiocarbonate ester to chalcopyrite

Add time:08/25/2019    Source:sciencedirect.com

In this paper, a novel surfactant, O-isopropyl-S-[2-(hydroxyimino) propyl] dithiocarbonate ester (IPXPO) was synthesized and first introduced as a collector, and its flotation behavior and adsorption mechanism to chalcopyrite were investigated by micro-flotation, adsorption thermodynamics and kinetics, in situ scanning electrochemical microscopy (SECM), Zeta potential and FTIR spectroscopy. IPXPO exhibited superior flotation performances to chalcopyrite in comparison to pyrite and preferably attached on to chalcopyrite surfaces at pH 4–9. The adsorption IPXPO on to chalcopyrite was agreed well with Langmuir isotherm and pseudo-second-order equation, and the adsorption ΔH (enthalpy change), ΔS (entropy change), ΔG (free energy change) and Ea (activation energy) were 70.44 kJ/mol, 332.23 J/mol/K, −28.49 kJ/mol (298 K) and 22.85 kJ/mol respectively, inferring a spontaneously endothermic chemisorption process. Zeta potential and in situ SECM images demonstrated that IPXPO might anchor on the positively charged sites of chalcopyrite surface to form new species. FTIR spectra further elucidated that the IPXPOCu surface complexes were produced probably by reaction of CS and CNOH groups of IPXPO with copper atoms to form CuS, CuN and CuO bonds on chalcopyrite surfaces. IPXPO's unique properties, such as two chelating groups and characteristic adsorption manner, rendered it to be a good collector for chalcopyrite flotation.

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