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| THE RATE OF IRON OXIDE REDUCTION WITH CHARCOAL |
| Lu CHAO-CHI;SHEN PONG-JU;KING DA-KONG;WU TZU-LIANG Institute of Metallurgy and Ceramics;Academia Sinica |
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Cite this article:
Lu CHAO-CHI;SHEN PONG-JU;KING DA-KONG;WU TZU-LIANG Institute of Metallurgy and Ceramics;Academia Sinica. THE RATE OF IRON OXIDE REDUCTION WITH CHARCOAL. Acta Metall Sin, 1958, 3(2): 111-119.
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Abstract By the reduction of mill scale of rimmed steel with charcoal,a high gradeiron powder(>98.5% Fe)suitable for powder metallurgy can be obtained. In the course of reduction at about 1000℃,Fe_2O_3 and then Fe_3O_4 was almostcompletely transformed into Wüstite within a few minutes prior to the formationof metallic iron;but the reduction of Wüstite to metallic iron lasted a much lon-ger time.Therefore the last stage reaction controls the whole reduction process.Inthe last stage of reduction,the iron substrates formed on the surface of Wüstite areporous and permeable to gaseous diffusion.The reduction rate is controlled by thesurface reaction on the Wüstite-iron interface,but the rate of this surface reactionis limited by the velocity of CO formation.The activation energy for the growth of iron substrates on the Wüstite surfacewas determined to be 57000 cal/mole,being comparable to the activation energyfor CO formation in most solid reducing agents such as coke,graphite and coal.Experimental results rther indicate that the effect of temperature on the reduc-tion rate of Wüstite arises from the temperature dependence of CO generation oncharcoal.
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Received: 18 February 1958
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