加速效应在阳离子交换法分离铀同位素中的应用
STUDY ON THE APPLICATION OF ACCELERATIVE EFFECT TO THE SEPARATION OF URANIUM ISOTOPES BY CATIONIC ION EXCHANGE
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摘要: 本文研究了丁二酸、Ca~+的加速效应在(O_2)_~(2+)-苹果酸-Na~+排代体系分离铀同位素中的作用。对(O_2)_~(2+)-苹果酸-丁二酸-Ca~(2+) (NH_4~+)排代体系的色谱特征、铀同位素的单级分离因子ε和斜率系数δ及它们的温度系数进行研究测定并和(O_2)~(2+)-苹果酸-Na~+排代体系作了对比后,肯定了丁二酸和Ca~(2+)对(UO_2)~(2+)传质的加速效应δ使值增加63％,或ε×δ值增加37％;还明确了(O_2)_2~(2+)-苹果酸-丁二酸-Ca~(2+)(NH_4~+)体系的铀区pH是可调控的,因而具有选择最佳分离条件的优点。Abstract: The function of the accelerative effect exerted by succinic acid and calcium ion on the separation of uranium isotope by UO22+-Mal-Na+ ion exchange displacement system was studied.The chromatographic characteristics,separation factor ?and slope coefficient g as well as their temperature coefficients for the UO22+-Mal-Suc-Ca2 + (NH4+ ) displacement system were studied and determined. By comparing the data obtained from the system described above with that from the UO22+-Mal-Na+ displacement system, we found that the g increases by a factor of 63% or g×ε by 37% due to the accelerative effect exerted by succinic acid-Ca2+ on the mass-transfer of UO22+. It was also shown that the UO22+ -Mal-Suc-Ca2+(NH4+) system is more adaptable for obtaining optimum experimental conditions because of its capability to control the pH of the solution involved in uranium-plateau.
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