Membrane assisted liquid extraction (MALE) technologies are gaining an important role as an extraction /separation technique for actinides and are being deployed as a promising
tool for remediation of nuclear waste generated in the reprocessing plant and other radioactive wastes containing a trace level of radionuclides. The present contribution outlines
the classification of membrane assisted liquid extraction techniques, its operating principle, associated transport mechanism and merits and demerits with respect to industrial
applications. Finally, selected applications of MALE techniques (BLM, SLM and ELM) are presented for extraction/separation of actinides and other radiotoxic nuclides from
.different streams of low level and high level radioactive w
Leopold, A.A.; Coll, M.T.; Fortuny, A.; Rathore, N.; Sastre, A. Journal of hazardous materials Vol. 182, num. 1-3, p. 903-911 DOI: 10.1016/j.jhazmat.2010.07.004 Data de publicació: 2010-07-29 Article en revista
This paper describes experimental work and the mathematical modeling of solvent extraction of cadmium(
II) from neutral and acidic aqueous chloride media with a Cyanex 923 extractant in Exxol D-100.
Solvent extraction experiments were carried out to analyze the influence of variations in the composition
of the aqueous and organic phases on the efficiency of cadmium(II) extraction. In neutral and acidic
chloride conditions, the extraction of cadmium(II) by the organophosphorous extractant Cyanex 923 (L)
is based on the solvation mechanism of neutral HnCdCl(2+n) species and the formation of HnCdCl(2+n)Lq
complexes in the organic phase, where n=0, 1, 2 and q = 1, 2. The mathematical model of cadmium(II)
extraction was derived from the mass balances and chemical equilibria involved in the separation system.
The model was computed with the Matlab software. The equilibrium parameters for metal extraction,
i.e. the stability constants of the aqueous Cd–Cl complexes, the formation constants of the acidic Cd–Cl
species and the metal equilibrium extraction constants, were proposed. The optimized constants were
appropriate, as there was good agreement when the model was fitted to the experimental data for each
of the experiments.