Adición de ligandos orgánicos para mejorar la disolución de cobre a partir de calcopirita en el medio acuoso de ácido sulfúrico-peróxido de hidrógeno-etilenglicol

Ángel Ruiz Sánchez; Gretchen L. Lapidus

doi:10.29057/aactm.v9i9.9427

Ángel Ruiz Sánchez National Tecnocogic Instituto of Mexico https://orcid.org/0000-0001-7517-2411
Gretchen L. Lapidus Aunonomous University of Mexico https://orcid.org/0000-0002-1792-8513

DOI: https://doi.org/10.29057/aactm.v9i9.9427

Keywords: Chalcopyrite leaching, Organic Ligands, Fenton and Fenton-type reaccion

Abstract

It has been found that the addition of ethylene glycol (EG) in a sulfuric acid-hydrogen peroxide leaching solution potentiates the dissolution of copper from chalcopyrite, however, at low (0.007M) concentration of sulfuric acid the Fenton reactions and Fenton type promote the rapid decomposition of hydrogen peroxide, which on the one hand limits the dissolution of copper and, on the other hand, mineralizes ethylene glycol. To avoid this problem, in this work the EG is replaced by organic ligands (EDTA or citric acid). The results showed that EDTA is the best organic ligand to improve the dissolution of chalcopyrite because it helps to further retard the decomposition of hydrogen peroxide and presents a mineralization of around 4%, while oxalic acid is mineralized. approximately 16% and only improves the chalcopyrite dissolution process by 5% with respect to the 0.007M sulfuric acid-1M hydrogen peroxide solution.

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