from the conferences organized by TANGER Ltd. provisional website
The ore raw materials of Au, Mo producing industry are predominantly sulphide. Technologies for their processing include the oxidation stage, for which chlorine, oxygen, ozone, nitric acid, Mn(IV), Fe(III), NaCiO are used. The nature of the oxidant and ligand of metal ions determines the kinetics of dissolution of minerals. Gravimetric, redox-measurements with gold-bearing ore and concentrate of the Kokpatas field and dissolution electrokinetics using a rotating disk electrode, with chalcopyrite-mineral of Cu-Mo ores of Almalyk field are conducted. Dissolution of sulfide mineral under the redox potential or its equal anodic polarization is represented by steps: - dissolution of the outer layer of the mineral; - diffusion of Cu(II), Fe(III) ions out its volume, - enrichment of the interphase boundary with sulfur (passivation). Electrokinetics measurements with chalcopyrite revealed a similarity of the processes of its reagent and anodic dissolutions in an acid medium: both were accompanied by passivation of the surface. For chalcopyrite the diffusion coefficient of Fe (III), Cu (II) ions in its solid state was calculated.Keywords: Sulphide ores, chalcopyrite mineral, electrokinetics
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