Enrichment of copper and recycling of cyanide from copper–cyanide waste by solvent extraction

The enrichment of copper from copper–cyanide wastewater by solvent extraction was investigated using a quaternary ammonium salt as an extractant. The influences of important parameters, e.g., organic-phase components, aqueous pH values, temperature, inorganic anion impurities, CN/Cu molar ratio, and...

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Bibliographic Details
Published in:International journal of minerals, metallurgy and materials metallurgy and materials, 2016-11, Vol.23 (11), p.1258-1263
Main Authors: Gao, Teng-yue, Liu, Kui-ren, Han, Qing, Xu, Bin-shi
Format: Article
Language:English
Subjects:
Aliquat
Ammonium
Ammonium salts
Anions
Ceramics
Characterization and Evaluation of Materials
Chemistry and Materials Science
Composites
Copper
Corrosion and Coatings
Cyanides
Efficiency
Fresh water
Glass
Impurities
Leaching
Materials Science
Metallic Materials
Natural Materials
Quaternary ammonium salts
Reagents
Solvent extraction
Solvents
Surfaces and Interfaces
Thin Films
Tribology
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Summary:The enrichment of copper from copper–cyanide wastewater by solvent extraction was investigated using a quaternary ammonium salt as an extractant. The influences of important parameters, e.g., organic-phase components, aqueous pH values, temperature, inorganic anion impurities, CN/Cu molar ratio, and stripping reagents, were examined systematically, and the optimal conditions were determined. The results indicated that copper was effectively concentrated from low-concentration solutions using Aliquat 336 and that the extraction efficiency increased linearly with increasing temperature. The aqueous pH value and concentrations of inorganic anion impurities only weakly affected the extraction process when varied in appropriate ranges. The CN/Cu molar ratio affected the extraction efficiency by changing the distribution of copper–cyanide complexes. The difference in gold leaching efficiency between using raffinate and fresh water was negligible.
ISSN:1674-4799
1869-103X
DOI:10.1007/s12613-016-1347-4