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Return to Abstracts of Literature 1500-1749

Literature Abstracts

 1658.    KAMURA, H.  Reduction of Ferric Oxide and Iron Ores by Hydrogen.  Jour. Iron Steel Inst., vol. 112, II, 1925, pp. 279-298; Chem. Abs., vol. 19, 1925, p. 3451.

        Samples of pure Fe₂O₃ and of hematite were heated to 500°-800° in a combustion tube, and H₂ was passed over them, the volume of gas used and the % of reduction to Fe being recorded at definite time intervals.  At 500° the time required for 90% reduction of the hematite was 78 min.; at 600°, 46 min.; at 700°, 39 min.; and at 800°, 30 min.  The volume of H₂ used also decreased with rise of temperature.  At about 570° the velocity of reduction increased rapidly and the volume of H₂ decreased suddenly, probably because reduction below this temperature was from Fe₃O₄ to Fe and above it from Fe₃O₄ to FeO and FeO to Fe.  As velocity of reduction increases slowly above 600°, this would be the most economical reduction temperature.