Statistical and kinetic study for leaching of covellite in a chloride media
| Autor: | Toro Villarroel, Norman Rodrigo, Pérez Salinas, Kevin, Briceño Romero, Williams, Navarra Lafontaine, Alessandro, Cánovas Vidal, Manuel, Trigueros Tornero, Emilio |
|---|---|
| Přispěvatelé: | Scientific Equipment Unit-MAINI of the Universidad Católica del Norte (Chile) |
| Rok vydání: | 2019 |
| Předmět: | |
| Zdroj: | Repositorio Digital de la Universidad Politécnica de Cartagena instname |
| Popis: | Covellite is a relatively rare copper sulfide with slow dissolution kinetics. The present investigation used the surface optimization methodology to evaluate the effect of three independent variables (time, chloride concentration and sulfuric acid concentration) on the rate of extracting Cu from covellite. The effects of chloride concentration and temperature over time were also studied. An ANOVA indicated that the linear variables of time and chloride concentration have the greatest influence, this being highly representative (R2 = 0.9945). The highest copper extraction rate (71.23%) at room temperature, was obtained with a high chloride concentration (100 g/L), a low concentration of sulfuric acid (0.5 M), and a leaching period of 600 h. The dissolution is described by the model of the unreacted core, the rate of leaching of the covellite is controlled by the chemical surface reaction at temperatures between 50 and 90°C, with concentrations of 0.5 M of H2SO4, 100 g/L of chloride, and a leaching period of up to 6 hours, where an activation energy of 72.36 kJ/mol was obtaine. The authors are grateful for the contribution of the Scientific Equipment Unit-MAINI of the Universidad Católica del Norte for aiding in generating data by automated electronic microscopy QEMSCAN® and for facilitating the chemical analysis of the solutions. We are also grateful to Marina Vargas Aleuy and Carolina Ossandón Cortés of the Universidad Católica del Norte for supporting the experimental tests. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|