Journal
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
Volume 492, Issue -, Pages 181-189Publisher
ELSEVIER
DOI: 10.1016/j.colsurfa.2015.11.003
Keywords
Synergism; Mixed collectors; Muscovite; Adsorption; Flotation
Categories
Funding
- National Natural Science Foundation of China [51304162, 51504224, 51504199]
- Foundation of Key Laboratory of Solid Waste Treatment and Resource Recycle Ministry of Education for Professional Innovation Research Team [14tdgk03]
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The synergistic effect of the mixed cationic dodecyl amine-hydrochloride (DDA) and anionic collector sodium oleate (NaOL) at the air/water interface was investigated by the surface tension measurements. Various physicochemical properties such as surface activity parameters (CMC, gamma(CMC), Gamma(max), A(min)), the micellar and interfacial compositions (X-1(m), X-1(sigma)) and interaction parameters (beta(m), beta(sigma)) were evaluated according to the theory of regular solutions. It is observed that the mixed DDA/NaOL at alpha(DDA) = 0.5 exhibit a maximum synergistic interactions at the air/water interface. The flotation and adsorption of DDA/NaOL at the solid-liquid interface was investigated by flotation tests with muscovite, contact angle measurements and adsorption measurements. The flotation results indicate that the recovery of muscovite could be achieved a maximum value (98.45%) by the mixed DDA/NaOL at alpha(DDA) = 0.25 at pH 7.0. Contact angle measurements further confirm that the DDA/NaOL exhibit more superior hydrophobicity and collecting property than the individual DDA and NaOL. And a more pronounced synergistic effect of DDA/NaOL on muscovite surface at alpha(DDA) = 0.25 is observed, which could be attributed to a favourable arrangement of adsorbing species. The adsorption results show that the individual cationic DDA can be adsorbed strongly onto the muscovite, but no significant adsorption of anionic NaOL can be detected. However, in the mixed systems, the adsorption amounts of both DDA and NaOL are enhanced due to co-adsorption. It is proved that there is also a remarkable synergistic effect of mixed DDA/NaOL collectors at the solid-liquid interface. (C) 2016 Published by Elsevier B.V.
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