Enhanced Chalcopyrite-Galena separation through Galena-Assisted ferric ion reduction in Fenton reaction

Developing an efficient and eco-friendly approach for the separation of chalcopyrite and galena is crucial for maximizing the resource utilization. This study explores the use of galena-assisted Fenton reaction as a method for depressing galena flotation. Various analytical techniques, including micro-flotation tests, contact angle (CA) measurements, Fourier Transform Infrared Spectroscopy (FT-IR) analysis, Scanning Electron Microscope (SEM) observation, X-ray Photoelectron Spectroscopy (XPS) studies, Raman Spectra determinations, electrochemical analysis, and UV-visible spectrophotometer (UV-vis) surveying, were employed to investigate the effectiveness of this approach. The results of the flotation tests reveal that the cooperation of ferric ions and hydrogen peroxide can strongly and selectively depress galena. The CA and FT-IR analyses demonstrate the significant decrease of hydrophobicity and collector adsorption of the galena surface by the synergistic effect of ferric ions and hydrogen peroxide. Further analysis using SEM, XPS, Raman spectra and electrochemical analysis show that galena can reduce ferric ions to ferrous ions, creating a Fenton reaction system upon the addition of hydrogen peroxide. The galena surface is intensely oxidized by the generated hydroxyl radicals, leading to the production of a compact layer of PbSO4. These findings provide a promising solution for the efficient and environmentally responsible separation of chalcopyrite and galena.