Iron ore. Fe2O3 + 3H2S = ...

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Iron ore. Fe2O3 + 3H2S = 2FeS + S + 3H2O

You would have to replace the iron ore every so often. The iron sulfide could be regenerated by roasting but the SO2 + SO3 generated would have to be trapped as H2SO4 or CaSO4. Another way would be to add sodium bisulfite: SO2  + 2H2S  = 2H2O + 2S