Аннотация:The solubilities of tantalum and niobium oxides, as well as the natural minerals of pyrochlore (Ca,Na)2(Nb,Ta)2O6(O,OH,F) and tantalite (Mn,Fe)(Ta,Nb)2O6 in (HF+HCl) mixed fluids were experimentally studied. The data obtained made it possible to estimate the equilibrium contents of niobium and tantalum in (HF+HCl) solutions at 300 - 550 ° C and 100 MPa in the presence of Co-CoO oxygen buffer. The initial HF concentration varied from 0.01m to 2 m, and the HCl concentration remained constant at 0.5 m. The effect of temperature on the solubility of Ta and Nb oxides, as well as pyrochlore and tantalite minerals, has been established. A comparative analysis of the equilibrium contents of Nb and Ta is carried out.
