Abstract
The formation of zinc-ferrite, from a stoichiometric mixture of ferric oxide and zinc oxide, and the dissolution of zinc-ferrite in dilute sulfuric acid have been investigated, with special reference to the ignition temperature of ferric oxide.The ferric oxide, which was ignited at higher temperature, showed the lower reactivity with zinc oxide, and the rate of formation of ferrite decreased with the increase in ignition temperature. The effect of ignition temperature was more apparent when the ferrite was formed at low temperature. The activation energies of formation of ferrite increased from 39 to 62 kcal/mol gradually, according to the increase in ignition temperature.The rate of dissolution of zinc-ferrite in sulfuric acid was lowered by raising the ignition temperature of ferric oxide and the formation temperature of zinc-ferrite.The dissolution rate was proportional to the surface area of ferrie particles and the activation energies of dissolution were 15-18kcal/mol in calculation.
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