Transport mechanism of uranium in the iodide process
Transport mechanism of uranium in the iodide process
复制标题
碘化过程中铀的输运机理
DOI：
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发表时间：
1967
期刊：
影响因子：
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通讯作者：
T. Kawai
中科院分区：
文献类型：
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作者：
T. Hashino;T. Kawai
本文通过理论计算，讨论了货车阿克尔-德波尔过程输送铀的可能性，并从理论上推导了铀的输送条件。实验观察到，铀在其中一些条件下成功转移，但在其他条件下则不然。在最佳条件下（两个温区分步排列的封闭传输系统）研究了该过程的动力学。从铀的沉积速率的速率控制阶段，取决于系统的总压力，被确定，它的结论是，铀的传输仅通过四碘化物，而三碘化物的形成速率是如此之慢，它基本上没有参与的过程。实验测得四碘甲烷气体的标准扩散常数为3.1 × 10 ~（-3）cm ~ 2/sec，并根据实验数据估算了系统中自然对流速度与总压的关系。
The possibility of uranium transport by the van Arkel-de Boer process is discussed in terms of a thermodynamical calculation, and the operating conditions are theoretically deduced. Experimentally it was observed that the uranium was successfully transferred under some of these conditions but not under others. The kinetics of the process were studied under the optimum condition (in a closed transport system with the two temperature regions arranged stepwise). From the deposition rate of uranium the rate-controlling stages, dependent on the total pressure of the system, were determined and it was concluded that the uranium transport was only via the tetra-iodide while the formation rate of the tri-iodide was so slow that it did not substantially participate in the process. The standard diffusion constant of the gaseous tetra-iodide was found to be 3.1 × 10–3 cm2/sec, and the dependence of the natural convection velocity on the total pressure in the system was evaluated from the experimental data.