702.    DIEPSCHLAG, E.  [Reduction of Iron Ore by Employing Higher Pressures.]  Arch. Eisenhüttenw., vol. 10, 1936, pp. 179-181; Chem. Abs., vol. 31, 1937, p. 635.

     Complete separation of the O from the Fe in the ore is possible only at temperatures over 1,000°.  Lower temperatures can, however, be used with fully the same efficiency and economy if the reduction is carried out at higher pressures, which increases velocity of reduction as the reduction gases penetrate, faster into the interior.  The reduction is greatest for pressures up to 3 atm. and more efficient in an atmosphere of CO than of H₂.  The following reactions take place:  3Fe₂O₃+H₂=2Fe₃O₄+H₂O; Fe₂O₃+H₂=2FeO+H₂O; Fe₂O₃+3H₂=2Fe+3H₂O; 3Fe₂O₃+CO=2Fe₃O₄+CO₂; Fe₂O₃+CO=2FeO+CO₂; Fe₂O₃+3CO=2Fe+3CO₂.

     DIETER, W. E.  See abs. 1448.

     DIETHELM, A.  See abs. 1616.

     DILTHEY, P.  See abs. 978, 979, 980, 981, 1043.

     DIMOCK, W. R.  See abs. 3747.

     DINERSTEIN, R. A.  See abs. 3767, 3768.

     DINGMANN, T.  See abs. 3052, 3053, 3055, 3057, 3059, 3061.

     DITTRICH, E.  See abs. 3456.