Abstract
Calcium lignosulphonate (CLS) is qualified as galena depressant in single mineral flotation, which has been proved in previous study. However, the selectivity of CLS in the flotation of Cu-Pb artificial mixed minerals is not satisfactory, which may be due to the interaction between minerals. In this study, the accidental adsorption mechanism of CLS on chalcopyrite surface was studied by replacing dissolved lead ions in galena with lead nitrate. Micro-flotation test results show that the selectivity of CLS is destroyed by lead ions in the pulp, resulting in a depression effect of CLS on chalcopyrite. X-ray photoelectron spectroscopy (XPS) and zeta potential analysis results show that the accidental adsorption (chemisorption) of CLS on chalcopyrite is caused by the pre-action (physisorptions) of lead hydroxyl as the dominant lead species on the chalcopyrite surface. Adsorption capacity measurement and contact angle tests further illustrate that the competitive adsorption of CLS and sodium butyl xanthate is intensified by the action of lead ions, which decreases the surface hydrophobicity of chalcopyrite. Atomic force microscope (AFM) imaging visually reflects the influence of lead ions in the adsorption of CLS on the chalcopyrite surface. The purpose of this work is to provide clues to the cause of poor selectivity of organic depressants in the separation of Cu-Pb sulphide minerals.
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