<報文>還元酸化の繰返えしが酸化ウラン粉末の反応活性におよぼす影響について

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  • カンゲン サンカ ノ クリカエシ ガ サンカ ウラン フンマツ ノ ハンノウ カッセイ ニ オヨボス エイキョウ ニ ツイテ
  • <Original Papers>On the Activation of Uranium Oxide Powder by the Repetition of Successive Reduction and Oxidation

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With the object of interpreting the known phenomenon that the repetition of successive reduction and oxidation would make uranium oxide powder more voluminous and chemically active, studies were made of the influence of this treatment upon the rate constant of the reduction of U_3O_8 to UO_2 by hydrogen. The following rate formula was given for the analysis of the present data : (1-c)^<1.3> = 1-kt where c is the fraction of oxide after the lapse of a definite time interval t and k is the rate constant. When reduction and oxidation were repeated successively, the rate constant increased, and after several repetitions it reached a definite value. This increase was mainly due to the increase in the total surface area caused by destruction of the powder. After the hydrogen pretreatment at various temperatures, the rate constants were determined at 500℃, and it was found that the higher the pretreatment temperature was, the smaller the first value of the rate constant was and that after several repetitions any powder showed the same value. Therefore when the properties of uranium oxide powder are to be studied, the above method may be recommended as a pretreatment for eliminating most of the effects caused by the preparation methods. It was also pointed out that this treatment improved the sinterbility and that this was of interest industrially.

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