Abstract
Sodium jarosite is readily converted into hematite by hydrothermal reaction at temperatures greater than 220°C. Although the initial acid and ferric ion concentrations must be kept low to avoid the unwanted formation of Fe(SO4)(OH), the conversion reaction is unaffected by modest concentrations of ZnSO4, FeSO4 or Na2SO4. Hematite seeding is desirable to promote the reaction and to stabilize the reaction system. The hematite conversion product will likely contain ∼0.5% Zn and ∼2% SO4; most of the arsenic in the jarosite will remain with the hematite.
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