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Adsorption of oleate species on sparingly soluble calcium minerals from aqueous solutions: a comparison of theoretical and experimental thermodynamic chemical equilibria
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Sustainable Process Engineering.
1991 (English)In: 3rd International Symposium on Beneficiation and Agglomeration: Bhubaneswar; India; 16-18 Jan. 1991, Indian Institute of Metals , 1991, p. 222-230Conference paper, Published paper (Refereed)
Abstract [en]

The adsorption of fatty acids on sparingly soluble minerals is a complex phenomena due to the fact that fatty acids are capable of forming precipitated phases with dissolved Ca ions from these minerals. A number of mechanisms have been proposed, but none has been fully substantiated. Adsorption and precipitation reactions in alkaline solutions of oleate in the presence of calcite, apatite, fluorite and scheelite have been explained through adsorption isotherms, electrokinetic studies and theoretical thermodynamic chemical equilibria calculations. The adsorption density at monolayer coverage corresponds to the condensed state of alkyl chain (liquid--crystal state) with a molecular coverage area of 33 A exp 2 . The application of two-dimensional condensation model is considered. These studies showed a bilayer formation in the case of apatite, fluorite and scheelite, and a monolayer formation in the case of calcite, prior to the three dimensional condensation of calcium oleate (precipitation) on the substrate

Place, publisher, year, edition, pages
Indian Institute of Metals , 1991. p. 222-230
National Category
Metallurgy and Metallic Materials
Research subject
Mineral Processing
Identifiers
URN: urn:nbn:se:ltu:diva-27404Local ID: 0d7730f0-2b40-11de-adf6-000ea68e967bOAI: oai:DiVA.org:ltu-27404DiVA, id: diva2:1000588
Conference
International Symposium on Beneficiation and Agglomeration : 16/01/1991 - 18/01/1991
Note
Godkänd; 1991; 20090417 (andbra)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2017-11-25Bibliographically approved

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