Flotation of kaolinite with dodecyl tertiary amines |
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Authors: | Xue-feng Cao Chang-miao Liu and Yue-hua Hu |
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Affiliation: | School of Resources Processing and Bioengineering, Central South University, Changsha 410083, China |
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Abstract: | The flotation of kaolinite using a series of tertiary amines (N,N-dimethyl-dodecyl amine (DRN), N,N-diethyl-dodecyl amine
(DEN), N,N-dipropyl-dodecyl amine (DPN) and N,N-dibenzyl-bodecyl amine (DBN)) was investigated. The results show that the
maximum recoveries of kaolinite for DEN, DPN and DRN are 93%, 88% and 84%, respectively, but that of DBN is very low. On the
basis of zeta potential and FT-IR spectra, the ionization of surface hydroxyl and isomorphic exchange of surface ions account
for the charging mechanisms of kaolinite surface. The adsorption mechanism of tertiary amines on kaolinite surface is mainly
electrostatic. The isoelectric point (IEP) of kaolinite increases from 3.4 to some more positive points after the interaction
of kaolinite with the four tertiary amines. The FT-IR spectra of kaolinite change with the presence of some new sharp shapes
belonging to the tertiary amines. The inductive electronic effects and space-steric effects of -CH3, -C2H5, -C3H7 and -C7H7 bonding to N atom result in different collecting power of the four tertiary amines. |
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Keywords: | kaolinite tertiary amine flotation electrostatic effect inductive electronic effect spaee-steric effect recovery |
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