HIGH-TEMPERATURE H2S REMOVAL FROM COAL-DERIVED GAS BY IRON-ORE

Six kinds of hematite and two kinds of magnetite were examined as solid sorbents of H2S for high-temperature desulfurization. The hematite samples were more reactive than the magnetite samples, and reactivity of the sample of iron ore depended on the specific ore. The hematite ores were confirmed to be effective sorbents of H2S in H2O-poor and/or H-2-rich gas. The reactivities of the samples of the hematite were decreased by the partial reduction to Fe3O4 with the simulated coal-derived gas (in the absence of H2S). Impurities and thermal history of an iron ore seemed to affect its reactivity. Pretreatment of iron ore with a gas mixture of 50% H-2-N2 at higher than 600-degrees-C for 1.5 h was found to be a useful activation method.