Adsorption of Collectors on Minerals — Effects of Lateral Interaction and Molecular Size
The Adsorption isotherm of CTAB on synthetic carbonate apatite minerals, with different CO3/PO4 molar ratios, was determined at controlled ionic strength, pH and temperature. Flotation recovery of apatite minerals were also determined for the same conditions. The results were analyzed according to the Langmiur, Flory-Huggins and Frumkin isotherms.
In this study the Frumkin isotherm was modified in order to account for the large size of the CTAB molecule. While the Langmiur and Flory-Huggins isotherms give rise to energies of adsorption ∆ G° independent of coverage, the Frumkin isotherms give rise to values dependent on coverage due to lateral interaction effects. The effect of the size of the CTAB molecule on the free energy of adsorption is evaluated. The results of flotation recovery were discussed in view of this analysis.
KeywordsFree Energy Change Lateral Interaction Adsorption Density Standard Free Energy Change Apatite Mineral
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