Abstract
A comparative study is made of the extractants D2EHPA and Cyanex 272 for the zinc and minor metal extraction from aqueous concentrated ammonium chloride solutions, as those of the leaching liquors of the CENIM-LNETI process. Extraction equilibrium data for zinc are presented as extraction isotherms at constant pH and at a temperature of 50 °C. Zinc extraction and coextraction of minor metal ions as Cu, Ca, Pb, Mg, Cd, Co, Ni and Hg are studied. Mercury does not extract from concentrated ammonium chloride solutions. Cyanex 272 shows a better selectivity for zinc with regard to the minor metals than D2EHPA, which is especially remarkable for calcium, the most coextracted element by D2EHPA. Nickel and cadmium coextraction is negligible for both extractants. The possible use of the Cyanex 272 as an alternative to D2EHPA is considered.
Highlights
The use of hydrometallurgical methods for the recovery of metáis has made possible to process low grade ores
New techniques have been developed like the solvent extraction, which improves the recovery, separation and
Among the reagents used for the solvent extraction of metáis the organophosphorous extractants have played an important role
Summary
The use of hydrometallurgical methods for the recovery of metáis has made possible to process low grade ores. New techniques have been developed like the solvent extraction, which improves the recovery, separation and (*) Trabajo recibido el día 3 de abril de 1995. Purification of metal valúes from the leaching liquors. Among the reagents used for the solvent extraction of metáis the organophosphorous extractants have played an important role. The bis (-2-ethylhexyl)phosphoric acid (D2EHPA) is the most characteristic and used of the organophosphoric acids. This extractant has been applied in many processes to recover metal valúes. Some of these processes have been described for the recovery of zinc [1]. D2EHPA has been used in many basic research studies with many metallic ions
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