Electrochemical and spectroscopic study of interfacial interactions between chalcopyrite and typical flotation process reagents

• Published in: International journal of minerals, metallurgy and materials metallurgy and materials, 2016-02, Vol.23 (2), p.127-136
• Main Authors: Urbano, Gustavo, Lázaro, Isabel, Rodríguez, Israel, Reyes, Juan Luis, Larios, Roxana, Cruz, Roel
• Format: Article
• Language: English
• Subjects: Adsorption; Ammonium; Ceramics; Chalcopyrite; Characterization and Evaluation of Materials; Chemistry and Materials Science; Composites; Contact angle; Corrosion and Coatings; Electrochemistry; Flotation; Fourier transforms; Glass; Hydrophobicity; Hydroxides; Infrared spectroscopy; Materials Science; Metallic Materials; Microflotation; Minerals; Natural Materials; Preconditioning; Raman spectroscopy; Reagents; Spectroscopy; Spectrum analysis; Starch; Starches; Sulfur dioxide; Surface chemistry; Surfaces and Interfaces; Thin Films; Tribology; 拉曼光谱; 氢氧化物; 浮选; 电化学; 界面相互作用; 矿物表面; 试剂; 黄铜矿
• ISSN: 1674-4799; 1869-103X
• DOI: 10.1007/s12613-016-1219-y

Comparative voltammetry and differential double-layer capacitance studies were performed to evaluate interfacial interactions between cnalcopyrite（CuFeS2） and n-isopropyl xanthate（X） in the presence of ammonium bisulfite/39wt%SO2 and caustic starch at different pH values.Raman spectroscopy,Fourier transform infrared（FTIR） spectroscopy,contact angle measurements,and microflotation tests were used to establish the type and extent of xanthate adsorption as well as the species involved under different mineral surface conditions in this study.The results demonstrate that the species that favor a greater hydrophobicity of chalcopyrite are primarily CuX and S^0,whereas oxides and hydroxides of Cu and Fe as well as an excess of starch decrease the hydrophobicity.A conditioning of the mineral surface with ammonium bisulfite/39wt%SO2 at pH 6 promotes the activation of surface and enhances the xanthate adsorption.However,this effect is diminished at pH ≥ 8,when an excess of starch is added during the preconditioning step.