MICROEhULSIONS AS ADAPTIVE SOLVENTS FOR HYDROMETALLURGICAL PURPOSES: A PRELIMINARY REPORT

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Abstract
A process aimed at concentrating aqueous dilute solutions of metallic cations is presented. This process is an extraction-reextraction sequence using an anionic surfactant microemulsion. A quantitative assessment of a complete extraction- reextraction cycle on aqueous solution of nickel (5000ppm) is given. The microemulsion phase is made with sodium dodecyl sulfate, n-decane, l-pentanol, and an aqueous solution of NiCl2. Preliminary phase diagram determinations are presented. They state the influence of temperature and“salinity” on the phase behaviour. By measuring the concentration of the all components in every appearing phase, effective ion exchange is pointed out and discussed. It is shown that an adequate combination of extraction-reextraction steps leads to a final concentration of nickel in the final aqueous phase three times larger than the original concentration.

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