Chalcopyrite dissolution using seawater-based acidic media in the presence of oxidants
| Autor: | Cynthia M. Torres, O. Herreros, Pía Hernández, Yousef Ghorbani, María E. Taboada |
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| Rok vydání: | 2015 |
| Předmět: |
Chalcopyrite
Inorganic chemistry Metals and Alloys chemistry.chemical_element Hydrochloric acid Sulfuric acid Copper Chloride Industrial and Manufacturing Engineering chemistry.chemical_compound Copper extraction techniques chemistry visual_art Materials Chemistry visual_art.visual_art_medium medicine Seawater Leaching (metallurgy) medicine.drug |
| Zdroj: | Hydrometallurgy. 157:325-332 |
| ISSN: | 0304-386X |
| DOI: | 10.1016/j.hydromet.2015.09.007 |
| Popis: | Due to water shortages and depletion of both surface water and underground aquifers, seawater is now used increasingly in the mining industry in northern Chile as a main alternative water resource. In this paper, the use of seawater in leaching of the chalcopyrite ore samples with copper grade of 1.6% in acidic media is investigated. Different leach solutions were prepared using different acids (H2SO4, HCl and HNO3) with and without seawater. Cupric chloride and ferric chloride were added as oxidant in the leaching process. Leaching tests were conducted in the agitated leaching reactors with 400 RPM using 100 g of the representative ore sample and 1 L of leach solution at 45 °C, with duration of 7 days. The ore was ground to P80 of 62.5 μm. The maximum copper extraction of 37.7% was obtained in the test performed using hydrochloric acid in the seawater-based media and in the presence of cupric chloride. In the leaching test conducted using sulfuric acid in the seawater-based media and in the presence of sodium chloride and cupric chloride, the maximum copper recovery of 34.2% obtained. In all of the different designed leaching approaches, the highest copper extraction was obtained in the tests performed with addition of the cupric ions (Cu2 +). In general, copper extraction in the leaching tests performed using seawater-based acidic media, were higher than those conducted in the pure water-based leaching media. Only exceptions observed when chloride ions (sodium chloride) were added externally. This indicated the importance of chloride ions presence in the leach solution. |
| Databáze: | OpenAIRE |
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