ARTICLE:

• VIABILITY OF THE LIQUID-LIQUID SEPARATION OF CADMIUM FROM PHOSPHORIC ACID USING ALIQUAT 336 AS EXTRACTANT  download article

A. M. Urtiaga
Dpto. de Quimica. E.T.S.I.I. y T. Universidad de Cantabria. Avda. de los Castros S/N. 39005, Santander, Spain

S. Zamacona
Dpto. de Quimica. E.T.S.I.I. y T. Universidad de Cantabria. Avda. de los Castros S/N. 39005, Santander, Spain

A. Irabien
Departamento de Ingenieria Quimica y Quimica Inorganica, ETSII y T., Universidad de Cantabria, Avda. Los Castros, s/n, 39005 Santander, Espana

I. Ortiz
Dpto. de Quimica. E.T.S.I.I. y T. Universidad de Cantabria. Avda. de los Castros S/N. 39005, Santander, Spain

ABSTRACT

In this work it is presented the viability of the application of the liquid-liquid extraction to the separation of cadmium from wet phosphoric acid using a new technology, non-dispersive liquid-liquid extraction (NDSX), as separation technique. Preliminary batch tests were carried out in order to select the most adequate cadmium extractant. Kinetic experiments with coupled extraction-stripping steps were performed in two hollow fibre modules working with industrial phosphoric acid and an ammonium quaternary salt, ALIQUAT 336, as selective extractant diluted in kerosene. A high cadmium separation efficiency, better than 95%, was obtained with a feed phase flow rate equal to 2 ml/min. The cadmium concentration in the stripping phase was increasing with the cadmium loading of the organic phase.

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