Effect of calcium ions on the adsorption of CMC onto the basal planes of New York talc - A ToF-SIMS study

Burdukova, E., Van Leerdam, G. C., Prins, F. E., Smeink, R. G., Bradshaw, D. J. and Laskowski, J. S. (2008) Effect of calcium ions on the adsorption of CMC onto the basal planes of New York talc - A ToF-SIMS study. Minerals Engineering, 21 12-14: 1020-1025.


Author Burdukova, E.
Van Leerdam, G. C.
Prins, F. E.
Smeink, R. G.
Bradshaw, D. J.
Laskowski, J. S.
Title Effect of calcium ions on the adsorption of CMC onto the basal planes of New York talc - A ToF-SIMS study
Journal name Minerals Engineering  (ERA 2012 Listed)    (ERA 2010 Rank A*)   Check publisher's open access policy
Publication date 2008-11
Sub-type Article
DOI 10.1016/j.mineng.2008.03.017
Volume number 21
Issue number 12-14
ISSN 0892-6875
1872-9444
Start page 1020
End page 1025
Total pages 6
Place of publication Oxford, London, U.K.
Publisher Pergamon
Language eng
Subject 0914 Resources Engineering and Extractive Metallurgy
Abstract Talc is a magnesium rich phylosilicate mineral that occurs as a gangue component of many base metal sulfide ore deposits around the world. The basal planes of talc are naturally hydrophobic and therefore talc is highly floatable. In order to reduce talc floatability, polymeric depressants such carboxymethyl cellulose (CMC) are commonly utilised. Typical depressants are natural cellulose based polymers such Depramin®, produced by Akzo Nobel. This paper examines the adsorption characteristics of a charged polymeric depressant (CMC) on the basal planes of New York talc using surface specific ToF-SIMS measurements. The effect of the presence of calcium ions in solution on the adsorption density of charged polymers is also studied. The adsorption density of CMC was measured both in the presence and absence of calcium ions in solution. It was found that the presence of calcium greatly enhanced the adsorption density of the polymer. This was attributed to the increased concentration of CaOH+ ions on the mineral surface, which facilitated polymer adsorption though acid/base interactions. The enhanced adsorption density was also attributed to the increased amount of coiling of the CMC macromolecules due to their reaction with Ca2+ ions.
Keyword Froth flotation
Flotation depressants
Particle morphology
Process instrumentation
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

 
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Created: Wed, 13 Jan 2010, 10:17:42 EST by Ms Therese Nolan-brown on behalf of Sustainable Minerals Institute