Investigation of dissolution kinetics of malachite ore in ammonnium acetate solutions

In this study, dissolution kinetics of malachite (CuCO3.Cu(OH)2) that is an oxidized copper ore in ammonium acetate solutions have been investigated. In the runs, the ammonium acetate concentration (C), the particle size (D), the solid to liquid ratio (K/S), the stirring speed (v), and the reaction temperature (T), have been chosen as variable parameters.As a result of present experiments, it has been seen that the dissolution rate increased with decraese in the particle size, the solid to liquid ratio, and with increase in the reaction temperature, the stirring speed and ammonium acetate concentration.The diisolution kinetics of malachite ore in ammonium acetate solutions according to the heterogenous reaction models were examined. It has been determined that the dissolution mechanism is controlled by three dimensional diffusion process. The mathematical model of dissolition kinetic can be expressed as.(1-(1-x)1/3)2 = 2,015x106.C1,563D-1,858(K/S)-0,334.?0,369.3.0 tActivation energy for this process has been calculated as 60.67 kJ/mol