Adsorption of Oleic Acid on Calcium Minerals

Chennakesavulu, K and Bhaskar Raju, G and Prabhakar, S (2007) Adsorption of Oleic Acid on Calcium Minerals. In: Mineral Processing Technology- 2007, 22-24 February 2007, Mumbai.



Adsorption of oleic acid on nuorite and calcite was studied by adsorption isotherms and Electro kinetic measurements. The adsorption of oleic acid on calcium minerals was observed to proceed initially by monolayer formation at lower concentrations followed by the physical adsorption of hydrocarbon chains in the second layer and finally the precipitated calcium oleate at higher concentrations. Compared to calcite. oleic acid was found to adsorb on fluorite at very low equilibrium concentrations. From the zeta potential measurements. the iso electric point (iep) values of fluorite and calcite are found to be 10.5 and 8,5 respectively. In presence of oleic acid the iep values of fluorite and calcite are shifted to 3.0 and 5.8 indicating specific chemical-interaction between surface calcium and oleate ions. The Free energy of adsorption was calculated from adsorption and Zetapotential measurements. The sign and magnitude of free energy of adsorption suggest the chemisorption of oleic acid on fluorite.

Item Type:Conference or Workshop Item (Paper)
Official URL/DOI:
Uncontrolled Keywords:Fluorite, calcite, adsorption, oleic acid, monolayer, free energy of adsorption, iso electric point, zetapotential
Divisions:NML Chennai > Mineral Processing
ID Code:4064
Deposited By:Dr. G Bhaskar Raju
Deposited On:28 Sep 2011 10:16
Last Modified:28 Sep 2011 10:16
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