Letter | Published:

Hydrogen Reduction Characteristics of Natural and Artificial Hæmatites

Naturevolume 191page268 (1961) | Download Citation



PUBLISHED data on the rate and mechanism of the reduction process in iron oxides are frequently discordant. This lack of agreement is exemplified by two recent studes1,2. McKewan1, for example, has reported the rate of reduction of hæmatite spheres in the size-range 0.6–2.5 cm. to increase continuously from 400 to 1,050° C. I found2, however, that hæmatite particles in the size range 0.002–0.008 cm. showed a rate maximum at about 550° C. and a pronounced rate minimum at 700° C. approximately.

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  1. 1

    McKewan, W. M., Trans. Amer. Inst. Min. (Metall.) Eng., 218, 2 (1960).

  2. 2

    Henderson, J., Amer. Inst. Min. (Metall.) Eng., Metall. Soc. Conf., 8, Phys. Chem. of Process Metallurgy, 671 (New York: Interscience, 1961).

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  1. Broken Hill Pty. Co., Ltd., Central Research Laboratories, Shortland, 2N, New South Wales



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