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Mechanism of oleate interaction on salt-type minerals: Part IV. Adsorption, electrokinetic and diffuse reflectance FT-IR studies of natural fluorite in the presence of sodium oleate
Centre de Recherche sur la Valorisation des Minerais, Vandoeure.
Centre de Recherche sur la Valorisation des Minerais, Vandoeure.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Sustainable Process Engineering.
1991 (English)In: Journal of Colloid and Interface Science, ISSN 0021-9797, E-ISSN 1095-7103, Vol. 145, no 2, p. 314-329Article in journal (Refereed) Published
Abstract [en]

The mechanism of oleate interaction with fluorite is investigated through adsorption, electrokinetic, and diffuse reflectance FT-IR measurements coupled with theoretical thermodynamic chemical equilibrium calculations. The adsorption isotherms exhibit an infinite increase in the slope beyond an oleate density of 10 μmole m-2. This adsorption density corresponds to a bilayer formation of oleate by two-dimensional condensation with a reported molecular coverage area of 33Ao2 (liquid-crystal state). Comparison of the theoretical chemical equilibria with the experimental data shows that the infinite increase in the slope of the isotherms is due to the precipitation of calcium oleate. The solubility product of this three-dimensional phase is found to be in the pK range 14.4-14.5, and agrees with most of the values quoted in the literature. From IR studies, monocoordination of oleate through counter sodium and calcium ions is suggested for the monolayer filling. ζ potentials of fluorite are correlated to the adsorption of oleate up to bilayer formation, and formation on surface of calcium oleate (three-dimensional growth on substrate) at high oleate concentrations. Two-dimensional condensation of oleate on the fluorite surface followed by the association of hydrocarbon chains (tail-tail bond) for the second layer, prior to the precipitation of calcium oleate in the bulk solution, is proposed as the adsorption mechanism.

Place, publisher, year, edition, pages
1991. Vol. 145, no 2, p. 314-329
National Category
Metallurgy and Metallic Materials
Research subject
Mineral Processing
Identifiers
URN: urn:nbn:se:ltu:diva-4460DOI: 10.1016/0021-9797(91)90364-EISI: A1991GB21300002Scopus ID: 2-s2.0-0026220661Local ID: 2663dc90-af65-11de-8293-000ea68e967bOAI: oai:DiVA.org:ltu-4460DiVA, id: diva2:977333
Note
Godkänd; 1991; 20091002 (hrao)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved

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Rao, K. HanumanthaForssberg, Eric

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