Semi-batch evaporative crystallization and drying of cobalt sulphate hydrates

Semi-batch evaporative crystallization of CoSO4 was investigated at various underpressures and with different heating powers. The for boiling aqueous solutions temperatures concentrations were measured compared to predicted values obtained by the Aspen Plus Version 11 process simulation software. presence solute decreased underpressure solution in comparison pure water. In experiments, crystallized as CoSO4.7H2O evaporation 30 °C 40 °C, whereas CoSO4.6H2O 60 80 °C. crystals mainly agglomerates octahedron shaped particles. Heating power mixing speed had significant effects on flux particle size distribution products. Smaller produced higher due enhancement evaporation. Dehydration formed cobalt sulfate heptahydrate drying also two variables: temperature time. yielded unstable CoSO4.7H2O, which tended dehydrate a range between 23 °C; these used study crystal drying. At transferred stabilized CoSO4.6H2O. stable hydrate form CoSO4.H2O. Gravimetric analysis, habit, XRD, Raman analyses successfully utilized investigation transformation during