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

作　　者：Gustavo Urbano Isabel Lázaro Israel Rodríguez Juan Luis Reyes Roxana Larios Roel Cruz 

机构地区：[1]Instituto de Metalurgia,Universidad Autonotrla de San Luis Potosi,Av,Sierra Leona 550,Lomas 2a Seccion,San Luis Potosi,S.L.P.78210,Mexico [2]Industrial Minera Mexico S.A.de C.V.,San Luis Potosi,S.L.P.,Mexico [3]Centro Universitario de Ciencias Exactas e Ingenierias,Universidad de Guadalajara,Guadalajara,Jalisco,Mexico

出　　处：《International Journal of Minerals,Metallurgy and Materials》2016年第2期127-136,共10页矿物冶金与材料学报（英文版）

基　　金：supported by Universidad Autónoma de San Luis Potosí(No.PROMEP/UASLP/12/CA15)

摘　　要：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.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.

关 键 词：sulfide minerals chalcopyrite xanthates flotation interfacial reactions electrochemistry spectroscopy 

分 类 号：TD952[矿业工程—选矿] TD923.1