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SynopsisIn order to examine the effect of alkali component on iron ore reduction, reduction tests were made using artificial MIO (Fe2O3 single crystals). MIO was grown in conc. NaOH or KOH solution by hydrothermal method and contained Na 0.12 wt% or K 0.20 wt%, respectively. It is considered that Na2O and K2O form solid solution in Fe2O3 crystal. In this experiment CO was generally used as reduction gas. After reduction the surface of the specimen was observed with SEM. In marked contrast to the reduction of artificial Fe2O3 grown by flux method (Na, K trace) and natural MIO (Na trace, K 0.01 wt%), in this case fibrous iron grew intensely and the growth position had no dependence on crystal plane index of Fe2O3. It is surmised that lattice defects caused by the solution of alkali element would enhance swelling phenomena during reduction.