Recovery of copper from ammoniacal/ammonium sulfate medium by LIX 54

✍ Scribed by Francisco José Alguacil; Manuel Alonso

• Publisher: Wiley (John Wiley & Sons)
• Year: 1999
• Tongue: English
• Weight: 85 KB
• Volume: 74
• Category: Article
• ISSN: 0268-2575
• DOI: 10.1002/(sici)1097-4660(199912)74:12<1171::aid-jctb155>3.0.co;2-y

✦ Synopsis

The extraction-stripping reaction of Cu(II) by LIX 54 in Iber¯uid from aqueous ammonium sulfate medium at pH 8.5 has been investigated. The effects of pH, metal ion, extractant concentration as well as the loading capacity of the reagent were studied. The extraction equilibrium constant for copper was determined numerically to be 7 Â 10 À7 . Experimental data can be explained assuming the formation of CuR 2 species in the organic phase (R represents the extractant). Copper stripping was studied using typical spent copper electrowinning solutions as stripping medium. The number of stages required for the extraction and stripping of copper was also evaluated. The results were used to asses the conditions for puri®cation of industrial waste solutions (eg spent etchants) containing copper through counter-current extraction-stripping.