Solvent extraction of Au(CN)2−1 with mixtures of the amine Primene JMT and the phosphine oxide Cyanex 923
| Autor: | C. Caravaca, Francisco José Alguacil, Ana Maria Sastre, J. Mochón |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 1997 |
| Předmět: |
Phosphine oxide
Aqueous solution Stripping (chemistry) Primene JMT Chemistry Cyanide Inorganic chemistry Extraction (chemistry) Xylene Metals and Alloys Diluent Industrial and Manufacturing Engineering chemistry.chemical_compound Cyanex 923 Materials Chemistry Amine gas treating Solvent extraction of Au(CN)2−1 |
| Zdroj: | Digital.CSIC. Repositorio Institucional del CSIC instname |
| Popis: | The partition of gold(I) between aqueous cyanide solutions and organic phases of the mixture of the amine Primene JMT and the phosphine oxide Cyanex 923 in xylene was studied at various aqueous pH values, extractant mixtures and gold concentrations, different temperatures and equilibration times. The behaviour of the extraction system with different organic diluents, aqueous ionic strengths and the selectivity of the system with respect to the extraction of different metal-cyano complexes was also investigated. The gold(I) extraction mechanism is discussed on the basis of the experimental results and numerical treatment of the experimental data, the species formed in the organic phase having the probable stoichiometry HAu(CN)2RNH2(R3PO)n, n being 1 (log Kext 11.94 ± 0.07) or 2 (log Kext 12.45 ± 0.I5). Stripping of gold from loaded organic solutions was also studied using low ionic strength alkaline solutions (NaCN at 50°C or NaOH at 40°C). |
| Databáze: | OpenAIRE |
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