Copper Analysis by Two Different Procedures of Sequential Extraction after Electrodialytic Remediation of Mine Tailings

Andrea Lazo, Pamela Lazo, Alejandra Urtubia, María Gabriela Lobos, Claudia Gutiérrez and Henrik K. Hansen
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Andrea Lazo: Departamento de Ingeniería Química y Ambiental, Universidad Técnica Federico Santa María. Avenida España 1680, Valparaíso 2390123, Chile
Pamela Lazo: Instituto de Química y Bioquímica, Facultad de Ciencias, Universidad de Valparaíso, Avenida Gran Bretaña 1111, Playa Ancha, Valparaíso 2360102, Chile
Alejandra Urtubia: Departamento de Ingeniería Química y Ambiental, Universidad Técnica Federico Santa María. Avenida España 1680, Valparaíso 2390123, Chile
María Gabriela Lobos: Instituto de Química y Bioquímica, Facultad de Ciencias, Universidad de Valparaíso, Avenida Gran Bretaña 1111, Playa Ancha, Valparaíso 2360102, Chile
Claudia Gutiérrez: Departamento de Ingeniería Química y Ambiental, Universidad Técnica Federico Santa María. Avenida España 1680, Valparaíso 2390123, Chile
Henrik K. Hansen: Departamento de Ingeniería Química y Ambiental, Universidad Técnica Federico Santa María. Avenida España 1680, Valparaíso 2390123, Chile

IJERPH, 2019, vol. 16, issue 20, 1-11

Abstract: The analysis of Cu distribution in pre-treated mine tailings after electrodialytic remediation was carried out by using two methods of sequential extraction. The initial content of copper in the tailings was 1109 mg Cu/kg of dry tailing, where close to 40% of the sample in weight corresponded to a soluble fraction. The tailing was treated with a leaching solution for 24 h. Three different solutions were tested: H 2 SO 4 + HNO 3 with pH = 1.9; H 2 SO 4 + HNO 3 with pH = 4.2; and NH 4 Cl 0.8 mol/L with pH = 5.5. After that, electrodialytic remediation experiments were carried out using an electric field of 2.7 V/cm for 15 days. The best performance for the complete cell was obtained with H 2 SO 4 + HNO 3 solutions, with a copper removal efficiency in the range of 62% to 67% and a current efficiency between 6% and 9%. The results of the remaining copper concentration between anode and cathode, from both procedures of sequential extraction, showed similar trends. The differences were mainly attributed to the use of different extractant solutions and extraction times. Soluble and exchangeable fractions were easily removed, with efficiencies higher than 80%. The lowest copper removal efficiency was obtained with NH 4 Cl 0.8 mol/L.

Keywords: leaching; sequential extraction; copper; fractions; electrodialytic remediation (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2019
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