研究4种十二取代叔胺(DRN,DEN,DPN和DBN)对高岭石的浮选行为.发现4种叔胺对高岭石的浮选捕收能力都较好,其中DEN最好,浮选回收率最高可达92%以上.4种叔胺主要依靠静电引力吸附在高岭石表面,在酸性pH范围内,浮选高岭石的回收率较高,随着pH的增大,叔胺的阳离子组分减少,使得浮选回收率下降.Zeta电位研究表明,高岭石在整个pH范围内,表面主要带负电,4种叔胺与高岭石作用后,能显著增加高岭石的Zeta电位.红外光谱研究表面,4种叔胺主要与高岭石表面发生了电性作用的物理吸附.叔胺中N原子上的取代基的给电子效应和空间位阻效应是造成4种叔胺浮选能力差异的主要原因.%The flotation performances of four tertiary amines (DRN, DEN, DPN and DBN) on kaolinite were studied in this paper. All the four tertiary amines show very good flotation effects on kaolinite, and DEN does the best, with the highest flotation recovery of 92 ％. In the acid pH scale, four tertiary can float kaolinite well because their cationics absorb onto the surface of kaolinite by electrostatic force; with the increasing of pH, the content of cationics was decreased to result in the lower flotation recovery. On the basis of Zeta potential, the surface of kaolinite is mainly electro-negative in the whole pH region, and its Zeta potential is remarkable increased after kaolinite was affected by four tertiary amines. Both the results of FY-IR spectra and Zeta potential show that four tertiary amines are absorbed onto the surface of kaolinite by electrostatic force. The flotation differences of four tertiary amines are due to the electronic effects and space steric effects of the substituents belonging to N atom in the amine molecule.
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