Tetsu-to-Hagane
Online ISSN : 1883-2954
Print ISSN : 0021-1575
ISSN-L : 0021-1575
Reduction and Dephosphorization of Molten Iron-oxide with Hydrogen-Argon Plasma
Yasushi NAKAMURAMichihisa ITOHidetake ISHIKAWA
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1980 Volume 66 Issue 14 Pages 2100-2105

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Abstract

Iron oxide (Whyalla ore) of 300 700 g charged in a water-cooled iron vessel was melted down by argon plasma, and then reduced by plasma of 10 50% H2-Ar mixtures. The flow rate of mixture was 10 l/min and the electric power was 15 kW. The result showed that the reduction degree of iron oxide was determined as a linear function of the ratio of hydrogen amount used to the weight of iron oxide charged. The utilization efficiency of hydrogen for the reduction reaction was found to be 50 70%, which was higher than the equilibrium values for H2-H2O-Fe-FexO system below 3 000°K. Such a high efficiency would result from strong reactivity of hydrogen atom which was formed by the thermal dissociation of hydrogen molecule in the plasma.
Phosphorus behaviour during the reduction of molten iron oxide containing P2O5, CaO, SiO2, and Al2O3 was examined. The calculation of material balance for phosphorus indicated that phosphorus was transferred out of the reactor. The amount of phosphorus transfer was found to increase exponentially with respect to the reaction time. The transferred amount decreased with increasing value of CaO/(SiO2+Al2O3) ratio.

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© The Iron and Steel Institute of Japan
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