二磷酸氢钛的加压合成及对锂同位素的分离效应

用无定型磷酸钛和磷酸在175℃,约3MPa气压下,合成的晶形细微化合物,即二水合二磷酸氢钛TI(HPO_4)_2·2H_2O],是一种层状结构的无机离子交换剂。在酸性和中性介质中其溶解度极小,对于钾、锂碱金属离子具有很好的交换吸附效应。以聚丙烯腈的二甲基甲酰胺溶液为粘合剂,压制成型,装制成色谱柱,以LiNO_3溶液为原料,HCl为洗脱剂,合理截取洗脱流分并测得~6Li和~7Li的单级分离因数为1.023,获得了文献中尚未报道过的结果。

Synthesis of Titanium (Ⅳ) Bis (hydrogenorthophosphate) hydrate and its Effect of Separation for Lithium Isotopes

Ti(HPO_4)_2·2H_2O was prepared by the reaction of titanium phosphate with H_3PO_4 at 175℃ about 2942 KPa, the solubility in the phosphate was remarkably low. It has a layer structure and a better effect of exchange and adsorption for the alkali metal ions. With polyacrylonitrile as inter carrier, adopting a method of manual press, we have changed Ti (HPO_4)_2·2H_2O to exchanger particle, and made several chromatographic columes. With LiNO_3 as raw liquid, HCl as eluent, reasonably intercepting and carturing elution cut, we have successfully separated ~6Li and ~7Li. Its single-stage separation factor is 1.023. Up to now, the method of separation for lithium isoptopes has never been reported yet.