Cupric and Chloride Ions: Leaching of Chalcopyrite Concentrate with Low Chloride Concentration Media
| Autor: | O. Herreros, Pía Hernández, Yousef Ghorbani, Cynthia M. Torres, Francisca J. Justel, Matías I. Aravena |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
inorganic chemicals
lcsh:QE351-399.2 chloride 0211 other engineering and technologies chemistry.chemical_element 02 engineering and technology Redox Chloride chemistry.chemical_compound Copper extraction techniques medicine Metallurgy and Metallic Materials chloro-complex cupric ion 021102 mining & metallurgy lcsh:Mineralogy Chalcopyrite Geology copper sulfide 021001 nanoscience & nanotechnology Geotechnical Engineering and Engineering Geology Copper chalcopyrite Copper sulfide chemistry Stability constants of complexes visual_art visual_art.visual_art_medium Leaching (metallurgy) Metallurgi och metalliska material 0210 nano-technology Nuclear chemistry medicine.drug |
| Zdroj: | Minerals Volume 9 Issue 10 Minerals, Vol 9, Iss 10, p 639 (2019) |
| ISSN: | 2075-163X |
| DOI: | 10.3390/min9100639 |
| Popis: | In this paper, the effect of the cupric and chloride ions concentrations on copper dissolution from chalcopyrite concentrate was studied in acidified media. Variables included three different concentrations of Cu2+ (0.5, 1.5, and 2.5 g L&minus 1), four different concentrations of Cl&minus (0, 5, 7, and 10 g L&minus 1), two different pH values of 1 and 2, and a constant temperature of 60 ° C. Results indicated that addition of Cl&minus to the system improves copper extractions, especially at higher concentrations of Cu2+. Initial copper concentrations in the leaching solution did not significantly affect the copper extraction when Cl&minus was not present. Better copper extractions were obtained at pH 1 as compared with pH 2. As the Cu2+ and Cl&minus concentrations were increased, higher values of redox potential were obtained. According to the formation constants of the chloro-complexes, the predominant species in the Cu2+/Cl&minus system in the studied interval were CuCl+ and Cu2+. Using a model of copper speciation in the experimental range predicted for a single copper concentration with increasing Cl&minus concentration, the Cu2+ concentration decreased significantly while the concentration of the chloro-complex species CuCl+ increased. In the leached residue, evidence of sulfur formation was found using SEM and corroborated by XRD analysis. When chloride is present in the medium, the amounts of copper and iron in the residue decrease, confirming a positive effect of chloride on the extraction of copper from concentrate for the studied conditions. |
| Databáze: | OpenAIRE |
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