Lithium isotope selectivities of lithium-specific adsorbents

锂专用吸附剂的锂同位素选择性

基本信息

批准号：
05808044
负责人：
OI Takao
金额：
$ 1.22万
依托单位：
Sophia University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1993
资助国家：
日本
起止时间：
1993 至 1994
项目状态：
已结题

项目摘要

Three lithium specific adsorbents have been prepared and their lithium isotope selectivity has been investigated. They were a manganese oxide-based adsorbent designated as MnO_2(Li) prepared by extracting lithium ions from the precursor, LiMn_2O_4, another manganese oxide-based adsorbent, HMnO(2Mg) prepared by extracting magnesium ions from Mg_2MnO_2 and antimonic acid, HSbO_3, with the monoclinic structure prepared by extracting lithium ions from LiSbO_3. Ammonium peroxodisulfate was found to be an excellent extractant of lithium and magnesium ions in the preparation of MnO_2(Li) and HMnO(2Mg). Isotopically, the three adsorbents examined were all ^6Li specific. The magnitude of the lithium isotope effect of MnO_2(Li) slightly decreased with the increase in the degree of manganese dissolution in the process of lithium extraction from the precursor and also decreased with the increase in the lithium/manganese molar ratio in the precursor between Li/Mn=0.5 and 0.8. The maximum separation factor for the lithium isotopes with MnO_2(Li) was 1.014 at 25ﾟC.Various properties of HMnO(2Mg) depended on the degree of magnesium extraction in the process of its preparation. With the increase in the degree of magnesium extraction, the lithium uptake increased, selectivity for the lithium ions increased, but unfortunately the separation factor value decreased. HSbO_3 showed the largest lithium isotope effect among the three adsorbents examined while the amount of lithium uptake was comparable to those of the other two adsorbents. The maximum separation factor value of HSbO_3 was 1.025 at 25ﾟC.However, it was very difficult to extract lithium ions adsorbed in HSbO3, which seemed a serious drawback of HSbO_3 as a lithium isotope separator.

已经制备了三种特异性吸附剂，并研究了其同位素的选择性。它们是一种基于氧化锰的吸附剂，该吸附剂通过从前体中提取锂离子Limn_2O_4（另一种基于锰的氧化物吸附剂，HMNO（2MG））通过从MG_2MNO_2和抗抗抗氧化剂中提取Monorcin lith sonorcin lith-hmno（2mg）来制备的MNO_2（li）。 Lisbo_3。在制备MNO_2（LI）和HMNO（2mg）时，发现过氧硫酸铵是锂和镁离子的极佳萃取剂。从同位素上讲，所检查的三个吸附剂都是特定于6li的。 Mno_2（li）的锂同位素效应的大小略有下降，随着锂从前体萃取锂的过程的增加，li/mn = 0.5和0.8之间的锂/锰磨牙比的增加也随着锂/锰摩尔比的增加而降低。 MNO_2（li）的锂同位素的最大分离因子在25°C c c c。hmno（2mg）的各种特性取决于其制备过程中镁提取的程度。随着镁提取程度的增加，锂吸收的增加，锂离子的选择性增加，但不幸的是，分离因子值降低。 HSBO_3在所检查的三种吸附剂中显示出最大的同位素效应，而锂摄取量与其他两个吸附剂的摄取量相当。 HSBO_3的最大分离因子值为1.025，在25°C. c。但是，提取吸附在HSBO3中的锂离子非常困难，这似乎是HSBO_3作为同位素分离器的严重缺点。