from the conferences organized by TANGER Ltd. provisional website
The sulphide phase of ore minerals is subject to passivation in oxidizing conditions. The kinetics of dissolution of polycrystalline sulfide minerals - the raw material of hydrometallurgy of molybdenum, copper, under conditions of variable hydrodynamics of interaction with the medium, is adequately described by the method of a rotating disk of dissolved material with a surface equally accessible to the diffusion of reagents. Overcoming the passivation of their surface is described by kinetic equations based on model representations. Objective: on the example of the behavior of Mo-concentrate in nitrate and hypochlorite electrolytes to describe the nature of the resulting products and the kinetics of their dissolution. Samples of Mo-concentrate (38% Mo in MoS2 phase) were used. The concentration of Cu (II), Fe (III), Mo (VI), Re (VII) ions in solutions was determined photocolorimetrically and spectrometrically (AAS Perkin-Elmer 3030B, ICP- Aligent 7500 ICP MS); thermal analysis was carried out by dilatography, and microscopy of samples was carried out on scanning electron microscopes: SEM-EDS EVO-MA (Carl Zeiss Instrum) and JCM – 6000 Neoscope II (JEOL); spectral analysis - on a Nicolet iS50 FT-IR spectrophotometer (Thermo Scientific, USA), diffuse reflection electronic spectra - on a UV-2600 spectrophotometer (Shimadzu); structural and phase analysis - on an XRD Empyrean X-ray diffractometer (PANalytical), kinetic measurements were performed on powder samples of sulfide concentrates, t:W = 1:7 and 1:75. For example, oxidation of Mo-concentrate samples in a sulfate-hypochlorite electrolyte, during 1800 seconds, the destruction of the phase of Mo, Cu sulfide compounds was established, with the transformation of their share into the oxide-sulfate phase. The kinetics of oxidation of a number of minerals in a sulfate-hypochlorite electrolyte was studied in the temperature range 20–40–70 °C, at atmospheric pressure. The samples of the solid phase after their leaching were studied by the methods of thermal analysis, optical, UV and IR spectroscopy, X-ray diffraction, electron microscopy, and probe microanalysis of the surface areas of the grains.Keywords: Sulfide minerals, Mo-concentrate, reagent, oxidation, leaching
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