1227.    GOTOH, Y.  [Reduction of Ferric Oxide by Hydrogen and Oxidation of Metallic Iron Reduced From Ferric Oxide.]  Mem. Ryojun Coll. Eng., Inouye Commemoration, vol. 1934, pp. 393-413; Chem. Abs., vol. 29, 1935, p. 2124.

       Describes apparatus for following changes of weight continuously by measuring the current required by a solenoid to counteract with displacement of a magnet attached to a silica spring, which is connected to a Pt bucket containing the sample.  The material used was pure Fe₂O₃ and Anshan hematite, containing Fe₂O₃ 93.89, Fe₃O₄ 2.61, SiO₂ 2.42 and Al₂O₃ 1.08%.  The reduction takes place in the stages Fe₂O₃→Fe₃O₄→Fe.  The reduction to Fe₃O₄ is rapid at all gas velocities; further reduction increases with increasing gas velocity up to 120 cc. per min.  At constant gas velocity, the rate of reduction of Fe₃O₄ increases with the temperature, being rather slow up to 450°.  The curves showed no breaks corresponding to FeO, and its absence was proved by X-ray photographs of samples at varying stages of reduction.

       GOTTLIEB, S.  See abs. 924, 925.