柠檬酸对微细粒绿泥石夹带行为的影响

通过浮选试验、Zeta电位测试、红外光谱分析、EDLVO理论计算及扫描电镜(SEM)分析研究了赤铁矿反浮选体系下柠檬酸对细粒绿泥石夹带行为的影响.浮选试验表明:添加柠檬酸促进了细粒绿泥石的夹带行为，有利于脱除铁精矿中的绿泥石.动电位测试和红外光谱分析表明:柠檬酸吸附在绿泥石和赤铁矿表面使其表面负电性增加进而增强其颗粒间的静电排斥力.EDLVO计算结果表明:赤铁矿和绿泥石之间存在吸引力，添加柠檬酸后，其作用力转化为排斥力，该计算同扫描电镜结果一致.

Effect of Citric Acid on Entrainment Behavior of Fine Chlorite

Flotation tests， Zeta potential measurements， infrared spectrum analyses， EDLVO calculations and SEM analyses were used to investigate the effect of citric acid on entrainment behavior of fine chlorite in hematite reverse flotation. Flotation results illustrated that citric acid promotes entrainment behavior of fine chlorite， and is conducive to removing chlorite in concentrate. Zeta-potential tests and infrared spectrum analyses indicated that adsorption of citric acid on the surfaces of chlorite and hematite increases their electronegativity and enhances the electrostatic repulsion between hematite and chlorite particles. EDLVO calculations demonstrated that the attraction between hematite and fine chlorite is transformed into repulsion after interacting with citric acid， and the calculation results are consistent with those of SEM.