Extraction Behavior of Strontium from Nitric Acid Solution with N,N,N’,N’-Tetraisobutyl Diglycolamide

The extraction behaviors of strontium from nitric acid solution were investigated with N,N,N’,N’-tetraisobutyl diglycolamide (TiBDGA). Effects of acidity, diluents, concentration of extractant and temperature on the distribution ratio of strontium (DSr) were examined. The stoichiometry of the extracted molecule was Sr2+:TiBDGA of 1:3. The apparent extraction equilibrium concentration constant logKex was 3.25. The enthalpy change ΔH and entropy change ΔS were -55.6 kJ mol-1 and -124 J mol-1 K-1, respectively. The extraction is an exothermic process. Through two strip stages, strontium could be stripped effectively by 0.01 M nitric acid solution