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Surface complexation at calcium mineral-water interfaces
1994 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Surface reactions occurring at solid-water interfaces in calcium mineral-ligands systems have been studied. Both hydrous apatite and fluorite surfaces show clear amphoteric properties. An ion exchange process between lattice ions of F- on fluorite and OH- ions in bulk solution is discovered. The surface adsorption of Alizarin Red S and sodium oleate are determined. Surface chemical reaction models are established based on acidbase potentiometric titrations, solubility, adsorption and zeta-potential measurements in 0. 1 mol dm-3 ionic media at 25'C. Experimental data are evaluated using the computer program FITEQL assuming a constance capacitance model for the electric double layer. Surface complexes identities are obtained from FT-IR, FT-Raman, and UV/visible spectroscopy studies. A series of surface equilibrium constants in the system are presented. The correlation between surface complex formation and mineral flotation is discussed.

Place, publisher, year, edition, pages
Luleå: Luleå tekniska universitet, 1994. , 57 p.
Doctoral thesis / Luleå University of Technologyy… → 31 dec 1996, ISSN 0348-8373 ; 149
Research subject
Chemistry of Interfaces
URN: urn:nbn:se:ltu:diva-25727Local ID: ac9af500-f64e-11db-ac79-000ea68e967bOAI: diva2:998882
Godkänd; 1994; 20070429 (ysko)Available from: 2016-09-30 Created: 2016-09-30Bibliographically approved

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