用三烷基(C_6-C_8)氧磷(TRPO)从强放废液中萃取锕系、镧系元素的研究

TRIALKYL (C_6-C_8) PHOSPHINE OXIDE FOR THE EXTRACTION OF ACTINIDES AND LANTHANIDES FROM HIGH ACTIVE WASTE

摘要: 本文研究了三烷基(C_6-C_8)氧膦(TRPO)对锕系、镧系元素及裂变产物的萃取行为;测得了铀、镎、钚、镅、锔等20余种离子在30％TRPO-煤油-硝酸溶液中的分配比以及部分离子的被萃络合物形式;测定了稀释剂、萃取剂浓度、温度、盐析剂等因素对TRPO萃取三价锕系和镧系元素的影响,为用TRPO萃取剂从强放废液中提取有用元素提供了基础数据。

Abstract: The extraction behavior of trialkylphosphine oxide (TRPO) for HAW constituents and factors (nitric acid and TRPO concentration, temperature, salting agent, diluent etc.) influencing extraction are studied. Distribution ratios of HAW constituents between 30% (vol.) TRPO-kerosene and aqueous nitric acid are determined. The solvation number and apparent equilibrium constants of certain ions in TRPO extraction are given. Results show that TRPO is a good extractant for the extraction of actinides and lanthanides from acidic HAW.