Abstract
The flotation separation of chalcopyrite from pyrite has attracted increasing attention due to the con-sumption of vast water resources and depressants.This study proposed the seawater oxidation pretreat-ment for non-depressant flotation separation of chalcopyrite from pyrite,as an effective and environmentally friendly strategy.Without the addition of depressants,seawater oxidation for 3 d effec-tively depressed pyrite flotation,with the highest recovery difference greater than 70％and a selectivity index greater than 6 between chalcopyrite and pyrite.The surface investigation showed that pyrite sur-face was more readily oxidized to form hydrophilic Fe oxidants/oxyhydroxides,as compared to that of chalcopyrite.Further UV-visible spectrophotometer and Fourier transform infrared spectrum(FTIR)results indicated that xanthate was less adsorbed onto the treated pyrite surface,resulting in un-floatable particles.Chalcopyrite surface was changed slightly due to seawater oxidation,thereby insignif-icantly affecting its flotation.The coordination theory was further used to reveal the combination mech-anisms between xanthate and pyrite or chalcopyrite.This study therefore provides a promising strategy to effectively separate chalcopyrite from pyrite,especially in the freshwater-deficient area.
基金项目
National Natural Science Foundation of China(51974215)
NETL
NSTL
万方数据