Copper extraction from chalcopyrite: Comparison of three non-sulfate oxidants, hypochlorous acid, sodium chlorate and potassium nitrate, with ferric sulfate
| Autor: | D.W. Shiers, N.J. Kelly, Helen R. Watling, D.M. Collinson |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Magnesium
Mechanical Engineering Chlorate Inorganic chemistry chemistry.chemical_element Potassium nitrate 02 engineering and technology General Chemistry Geotechnical Engineering and Engineering Geology 020501 mining & metallurgy chemistry.chemical_compound 0205 materials engineering chemistry Copper extraction techniques Nitrate Control and Systems Engineering medicine Ferric Sulfate Sodium chlorate medicine.drug |
| Zdroj: | Minerals Engineering. 85:55-65 |
| ISSN: | 0892-6875 |
| DOI: | 10.1016/j.mineng.2015.10.019 |
| Popis: | Three oxidants, hypochlorous acid, chlorate and nitrate, were assessed for their ability to oxidise chalcopyrite (CuFeS2). Hypochlorous acid was the most aggressive oxidant trialled, with copper extraction reaching a plateau after 1–5 h. Extraction in this system was complete at room temperature when reagent concentrations of 0.3–0.4 M were supplied. Optimal conditions utilising chlorate as an oxidant measured final extractions of 66–72% after 168 h. Optimal conditions utilising nitrate enabled a final extraction of 92% in systems using milled ore. Gangue dissolution in the presence of each oxidant varied. The system utilising nitrate resulted in comparatively high levels of magnesium and aluminium extraction, 28% and 32%, respectively. The chlorate system, over an identical time period and similar solution pH, had magnesium and aluminium extractions of 7% and 6%. These data, together with those for silicon dissolution, are indicative of incongruent silicate dissolution. Iron extraction data indicated that ferric hydroxy-oxide precipitates formed during leaching in both nitrate and chlorate systems. All systems tested offered improved rates of copper extraction relative to systems utilising ferric sulfate as an oxidant. |
| Databáze: | OpenAIRE |
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