Experimental research and kinetics analysis on hydrogen reduction of limonite

This article presents experimental studies on the effects of H₂ on the reduction degree and rate of limonite at different temperatures and kinetic analysis during the hydrogen reduction. The water loss of limonite was investigated by thermal gravimetric analysis. Limonite of 8 to 12 mm in granularity was reduced with 4 L·min^-1 H₂ at five temperatures of 750 to 950℃. As the reduction reaction proceeded, the reduction degree increased, and the sequence of 5 reduction degree curves was consistent with that of reaction temperature when t>28 min. The apparent activation energy was kinetically calculated to be 15.323 kJ·mol^-1, so diffusion is the restrictive step of the reduction reaction.