Beschreibung:
Thiophosphate compounds have attracted much attention in coordination chemistry, but their deep adsorption mechanism remains underexplored as flotation collectors. The flotation performance and adsorption mechanism of a novel (dibutoxy-thiophosphorylsulfanyl)-acetic acid (CDDP) chelating collector on azurite surface was investigated by micro-flotation tests, zeta potential measurements, and FTIR, XPS and FE-SEM analysis. The micro-flotation results demonstrated that compared with sodium isoamyl xanthate (NaIX) and benzohydroxamic acid (BHA), CDDP exhibited superior collecting performances to direct flotation recovery of azurite and floated out above 91.44% azurite at pH 7. The results of zeta potential, FTIR, XPS and FE-SEM measurement, all of which confirmed that CDDP showed a better affinity to azurite surface than NaIX and BHA. Furthermore, XPS and FE-SEM provided obvious evidence that CDDP could easily react with Cu 2+ sites on azurite surfaces. Using the density functional theory (DFT) method, the collection capacity of azurite is CDDP>BHA>NaIX, which exactly matches the result of micro-flotation results. In addition, this study provides an atomic-scale understanding of the structure-property relationship of CDDP as chelating agents for copper minerals flotation