Synthetic zinc ferrite (ZnO·Fe2O3) samples were dissolved in 1 M HClO4 solutions with dissolved Fe(ClO4)2 at 90°C. The dissolution rate of ZnO·Fe2O3 was dependent upon the Fe2+ concentration, with an order of 0.43±0.03. It was shown that equivalent leach experiments carried out in D2O and H2O in the presence of 5 g/l Fe2+ resulted in a dissolution rate which was twice as high in H2O as in D2O. In 0.5 M H2SO4 at 90°C, in the absence of Fe2+ ions, the rate constant for ZnO·Fe2O3 dissolution was 11% higher in H2O than in D2O. A mechanism is proposed which describes the dissolution of ZnO·Fe2O3 in the presence and in the absence of complexing or reducing agents in H2O or D2O.
ASJC Scopus subject areas
- Metals and Alloys
- Industrial and Manufacturing Engineering
- Materials Chemistry