HBTMPDTP对Pu(Ⅲ)的萃取行为研究

Study on Extraction Behavior of Pu(Ⅲ) in HBTMPDTP(Kerosene)-HNO₃ System

摘要: 实验研究二(2，4，4-三甲基戊基)二硫代膦酸(HBTMPDTP)对Pu(Ⅲ)的萃取行为。考察了搅拌时间、平衡水相 pH、水相不同盐分、萃取剂浓度以及温度等因素对萃取平衡的影响。给出了萃取反应方程式，并计算获得了萃取平衡常数、萃取反应焓和熵。通过与文献中所报道的HBTMPDTP对Am(Ⅲ)、Cm(Ⅲ)的萃取行为比较可知，HBTMPDTP萃取Pu³⁺、Am³⁺、Cm³⁺的能力依次为Pu³⁺＞Am³⁺＞Cm³⁺。

Abstract: Extraction chemical behavior of Pu(Ⅲ) by bis(2,4,4-trimethylpentyl)-dithio-phosphinic acid(HBTMPDTP) was studied. The distribution ratios of Pu(Ⅲ) were varied with stirring time, pH of equilibrated aqueous phase, salinity, concentration of HBTMPDTP, and temperature. The equation of extraction was obtained and some parameters such as equilibrium constant, extraction enthalpy, extraction entropy were calculated. Comparing with other actinide ions, extraction of Pu(Ⅲ) by HBTMPDTP is easier than that of Am³⁺ and Cm³⁺. The order of the extraction capacity is as follow: Pu³⁺＞Am³⁺＞Cm³⁺.