３インチ直径流動層による酸化ウランの低温フッ素化

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  • Low Temperature Fluorination of Uranium Oxides in 3-inch Diameter Fluidized Bed
  • 3インチ チョッケイ リュウドウソウ ニヨル サンカ ウラン ノ テイオン フ

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In the R & D program of the fluoride volatility process, fluorination characteristics of UO2 under low temperature have been studied in batch and semi-continuous operation with 3 inch diameter fluidized bed. Fluorination rates and technical experiences in handling kilogram quantities of fluorine and UF6 were obtained. Major characteristics of low temperature fluorination around 350°C and 20v/0 (F2) are as follows:<BR>(1) The fluorination rate is not only lower, but the reaction behavior is more complex than that in high temperature over 400°C, where it could be approximated with a single step fluorination of UO2F2, a rate-controlling intermediate.<BR>(2) The high acceleration effect of simulated fission products on the reaction rate is observed and the reaction behavior is simplified to the similar pattern to that in high temperature.<BR>(3) On a technical problem, unstable fluidizability of the reactor results from the accumulation of complex intermediates in the reactor.

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