Solvent Extraction of Metal Ions from Synthetic Copper Leaching Solution Using R4NCy

Metals

Patricio Navarro¹  Cristian Vargas¹  Pía Hernández²  Rossana Sepúlveda³  Jonathan Castillo³  Edelmira Gálvez⁴  Norman Toro⁵ 

[1] Departamento de Ingeniería Metalúrgica, Facultad de Ingeniería, Universidad de Santiago de Chile (USACH), Santiago 9170124, Chile;Departamento de Ingeniería Química y Procesos de Minerales, Universidad de Antofagasta, Av. Angamos 601, Antofagasta 1270300, Chile;Departamento de Ingeniería en Metalurgia, Universidad de Atacama, Copiapó 1531772, Chile;Department of Metallurgical and Mining Engineering, Universidad Católica del Norte, Avenida Angamos 0610, Antofagasta 1270709, Chile;Faculty of Engineering and Architecture, Universidad Arturo Prat, Iquique 1100000, Chile;

关键词: ionic liquid;    leaching;    hydrometallurgy;    green chemistry;   

DOI  :  10.3390/met12061053

来源: DOAJ

【 摘 要 】

Recent works suggest that the use of ionic liquids in the copper solvent extraction industry is feasible. However, the reports did not use real solutions (or synthetic solutions with various elements). This fact remains poorly established, and the interaction efficiencies are still under study. The objective of this research is to explore the extraction and stripping of the four major elements present in a copper industrial pregnant leach solution (Cu(II), Fe(III), Mn(II), and Zn(II)) using the methyltrioctyl/decylammonium bis(2,4,4-trimethylpentyl)phosphinate (R₄NCy) ionic liquid as an extractant. The work conditions studied in extraction were ionic liquid concentration, initial pH, and O/A ratio, and in stripping were H₂SO₄ concentration and O/A ratio. The test was carried out at room temperature and ambient pressure. High efficiency and selectivity (99.82% and 113,755 over Cu(II), respectively) were observed for Fe(III) extraction over the other elements. Moreover, after the extraction test, significant difficulty in stripping Fe(III) loaded in the ionic liquid was observed (28.7% at 0.5 M of H₂SO₄). Finally, the present study demonstrates that the R₄NCy ionic liquid is not suitable for copper extraction because it has a higher selectivity for Fe(III) and Zn(II).

【 授权许可】

Unknown