Reduction Behavior of Wustite Pellets with Different Levels of Porosity by Hydrogen Containing Hydrogen Sulphide at Elevated Temperatures

HAYASHI Shoji, IGUCHI Yoshiaki, HIRAO Jiro

doi:10.2355/tetsutohagane1955.71.6_672

In order to understand the effect of sulphur in reducing gas on the reduction behavior of iron oxides, the reduction experiments were conducted in H₂-H₂S mixtures with various sulphur activities at 1 000 and 1 200°C. <BR>Macroscopic reduction patterns of pure wustite pellets can be divided into seven types, depending on the porosity of pellets and the activity of sulphur in the gas. This classification is slightly modified by the addition of MgO and CaO. <BR>The reduction of pellets with low porosity is retarded greatly due to the formation of iron-oxysulphide liquid. The retardation of reduction does not occur with pellets of high porosity even under the high sulphur activity to form FeS. However, the reduction is retarded provided that the sufficient amount of the liquid to fill up the pores is formed. <BR>The activity of sulphur in equilibrium under iron, wustite and iron-oxysulphide liquid was determined experimentally. MgO in wustite raises the sulphur activity and CaO lowers it. <BR>Sulphur in the gas without the formation of sulphides causes the topochemical reduction pattern, independently of the presence of foreign oxides.

Reduction Behavior of Wustite Pellets with Different Levels of Porosity by Hydrogen Containing Hydrogen Sulphide at Elevated Temperatures

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