3033.     SAWAMURA, H.  [Dissociation of Carbon Monoxide in Contact With Various Kinds of Iron Ore.]  Tetsu-to-Hagane, vol. 22, 1936, pp. 121-126; Japan. Jour. Eng., vol. 16, p. 122; Chem. Abs., vol. 33, 1939, p. 4500.

        Sawamura made experiments on 2 important behaviors of CO in contact with various kinds of Fe ore in a more rigid manner than was done in the experiments hitherto published, namely:  (1) The dissociation velocity of CO at 450°; (2) effect of C deposited in Fe ore owing to the dissociation of CO upon the disintegration of Fe ore.  For this purpose, 13 kinds of original ore, besides 5 agglomerated and 1 roasted ore, were taken as samples.  For measuring the dissociation velocity of CO, Honda’s thermobalance was used.  Disintegration of Fe ore heated in CO takes place when it expands, owing to the C deposited in it.  this expansion was measured by a special dilatometer, the so-called gas-dilatometer devised by Sawamura.  No definite relation could be found between the experimental results and the porosity and the content of Fe having 2 valences in Fe ore.  It was found, however, that the dissociation velocity of CO is greater when in contact with hematite or limonite than when in contact with magnetite, and that hematite or limonite in CO is liable to disintegrate more easily than magnetite.