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Mechanism of oleate interaction on salt-type minerals Part III: Adsorption, zeta potential and diffuse reflectance FT-IR studies of scheelite in the presence of sodium oleate
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Sustainable Process Engineering.
1991 (English)In: Colloids and Surfaces, ISSN 0166-6622, E-ISSN 1873-4340, Vol. 54, p. 161-187Article in journal (Refereed) Published
Abstract [en]

The mechanism of oleate adsorption on scheelite has been examined through adsorption isotherms, zeta-potential measurements and diffuse reflectance FT-IR studies.The form of the adsorption isotherms for alkaline pH values indicated a bilayered structure of oleate, proceeding the precipitation of calcium oleate. The precipitation of calcium oleate is characterized by a steep increase in the slope of the adsorption isotherms after 10 μmol m-2 adsorption density. This adsorption density corresponds to a condensed state of oleate molecule for a bilayer formation with a molecular coverage area of 33 Å2 (liquid-crystal state). In the monolayer filling, monocoordination of oleate through counter sodium and calcium ions is suggested from the IR studies. A linear relationship between the amount adsorbed and the Kubelka-Munk function of diffuse reflectance is obtained. The zeta potentials are correlated to a successive oleate adsorption up to a bilayer formation. At high oleate concentrations, the constant negative zeta potentials ( - 52 mV) corresponds to that of calcium oleate, suggesting that the solids are covered with a layer of calcium oleate precipitate.Monocoordination of oleate through counter sodium and calcium ions in the monolayer range followed by a bilayer formation through hydrophobic association of hydrocarbon chains, prior to the growth of calcium oleate precipitate on the substrate, is suggested for the adsorption mechanism of oleate on scheelite

Place, publisher, year, edition, pages
1991. Vol. 54, p. 161-187
Keywords [en]
Technology - Chemical engineering
Keywords [sv]
Teknikvetenskap - Kemiteknik
National Category
Metallurgy and Metallic Materials
Research subject
Mineral Processing
Identifiers
URN: urn:nbn:se:ltu:diva-4879DOI: 10.1016/0166-6622(91)80058-VISI: A1991FC63800014Scopus ID: 2-s2.0-0003636757Local ID: 2e1e8590-af45-11de-8293-000ea68e967bOAI: oai:DiVA.org:ltu-4879DiVA, id: diva2:977753
Note
Godkänd; 1991; 20091002 (andbra)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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