Abstract: The flotation behavior of dodecylmorpholine for sodium chloride particles in saturated brine was investigated.The results showed that NaCl particles improved the flotation ability of dodecylmorpholine by increasing the stability of bubbles.The result of infrared spectroscopy showed that the interaction between DMP molecule and NaCl particle was physical adsorption.The adsorption behavior of DMP on NaCl particle surface and the contact angle of NaCl particle surface were investigated.The results showed that the flotation mechanism of DMP with NaCl particle was that the dodecylmorpholine molecules adsorbed on NaCl particle surface by hydrophobic force in saturated brine medium while did not adsorb on carnallite（KCl•MgCl₂•6H₂O）particle surface due to repulsive hydration.NaCl particle was floated selectively in froth flotation because bubbles were adhered on NaCl particle by hydrophobic force with DMP molecule adsorbed on the interface of bubble.

摘要： 通过研究十二烷基吗啉（DMP）在饱和卤水中对氯化钠颗粒的浮选行为，揭示了氯化钠颗粒通过增强体系泡沫的稳定性而提高了十二烷基吗啉的浮选性能;运用红外光谱法研究证明，DMP分子以物理作用力吸附于氯化钠颗粒表面;同时，研究了十二烷基吗啉分子在氯化钠颗粒表面的吸附行为及精光卤石颗粒与各种条件下氯化钠颗粒表面的接触角.研究结果表明，十二烷基吗啉选择性浮选分离氯化钠颗粒的作用原理是：十二烷基吗啉分子在饱和卤水介质中由于受到很强的疏水力，选择性吸附于氯化钠颗粒表面;且因精光卤石（KCl•MgCl₂•6H₂O）颗粒表面有很强的水合斥力，十二烷基吗啉分子不能吸附于精光卤石颗粒表面;因此，在浮选过程中，吸附在气泡界面的DMP分子因受到疏水作用力，使气泡吸附在氯化钠颗粒表面，氯化钠颗粒被浮选分离.