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The hydrogen-reduction of spheroidal pyrrhotite particles, varying in diameter from about 0.4 to 1.6 cm, was investigated at 600, 800, and 900~Microscopic examination of partially reduced samples showed a well-defined interface between unreacted pyrrhotite and a porous iron shell. The rate of reduction is controlled primarily by counter-current diffusion of Ha and HaS in the gas-film boundary layer and in the porous iron layer. The magnitude of the ratio of effective diffusivity to the molecular interdiffusivity for Ha-HaS, derrived from the reduction data, suggests that the structure of the porous iron formed is similar to that of an idealized porous material.

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