Isolation of Rare Earth Element's Radionuclides from Phosphoric Acid Solutions on Cerium (III) Phosphate
Isolation of Rare Earth Element's Radionuclides from Phosphoric Acid Solutions on Cerium (III) Phosphate
复制标题
DOI：
10.1080/10426509008040973
复制
发表时间：
1990-09
影响因子：
1.3
通讯作者：
I. Melikhov;Y. Trofimov;D. Chirkst;K. Chalian;Yu. Dibrov
中科院分区：
文献类型：
--
作者：
I. Melikhov;Y. Trofimov;D. Chirkst;K. Chalian;Yu. Dibrov
摘要研究了从磷灰石破坏过程中产生的浓度为2-5 mol·dm-3的磷酸溶液中结晶分离镧系磷酸盐的方法。根据Ce ~（144）和Eu ~（152 -154）放射性核素在溶液和固相之间的分布数据，得到了镧系磷酸盐在60-90°C温度范围内的结晶动力学参数及其在含各种杂质的磷酸中的溶解度值。确定了过饱和溶液亚稳性的宽范围。通过引入磷酸铈（III）晶种来消除亚稳区过饱和的可能性已被证明。本文研究了磷酸盐在CePO_4·0.5H_2O晶种上，在强酸性溶液的小过饱和度范围内结晶，使磷灰石中的镧系元素与钙及其它伴生元素分离。磷酸钙展示了“盐”的作用。
Abstract The isolation of the lanthanide phosphates by crystallization from the solutions of phosphoric acid with the concentration of 2–5 mol·dm−3, produced during destruction of the apatite, was investigated. The kinetic parameters of crystallization of the lanthanide phosphates and the values of their solubility in phosphoric acid with various impurities under temperatures between 60–90°C have been obtained from the data on distribution of Ce144 and Eu152–154 radio- nuclides between the solution and the solid phase. The wide region of supersaturated solution metastability has been determined. The possibility to remove supersaturation in the metastable region by introduction of the cerium (III) phosphate seeds has been proved. Separation of the lanthan-ides from calcium and other accompanying elements in the apatites by crystallization of the phosphates on the CePO4 ·0.5H2O seed in the region of small supersaturation of strongly acid solutions has been studied. Calcium phosphate demonstrates the “saltin...