Gemini trisiloxane surfactant: Synthesis and flotation of aluminosilicate minerals |
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| Affiliation: | 1. College of Resources and Environment Engineering, Wuhan University of Technology, Wuhan 430070, China;2. School of Chemical Engineering, The University of Queensland, Brisbane, Queensland 4072, Australia;3. Department of Materials Science and Engineering, Southern University of Science and Technology, Shenzhen 518055, China |
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| Abstract: | In this paper, an amino-trisiloxane Gemini cationic surfactant, butane-1,4-bis(dimethyl-(3-(3-aminopropyl trisiloxane-3-yl)-propyl)-ammonium bromide) (BBAB) was prepared, and its flotation potential was assessed on kaolinite, pyrophyllite and illite minerals. The flotation results showed that changes to the pulp pH did not significantly influence BBAB’s collecting power in floating three aluminosilicate minerals. In addition, BBAB was a stronger collector than the conventional monomeric surfactant dedecyl trimethylammonium bromide (DTAB) or dodecylamine (DDA). The results of FTIR spectra, zeta potential measurements and density functional theory (DFT) calculations indicated that the interaction of BBAB with the three aluminosilicates was mainly through electrostatic attraction. BBAB’s unique properties, such as high positive grouping Mulliken charge of –CH2N+(CH3)2(CH2)4(CH3)2N+CH2–, and “parachute” shape structure of (CH3)3SiO]2SiCH3, resulted in superior collecting powers for the aluminosilicate minerals. |
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| Keywords: | Reverse flotation Aluminosilicate minerals Diasporic bauxite ores Gemini trisiloxane surfactant Density functional theory (DFT) calculation |
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