2330 XXXI International Mineral Processing Congress 2024 Proceedings/Washington, DC/Sep 29–Oct 3
Table 5. Estimation of the parameters of the temperature-dependent Langmuir fitting of the adsorption isotherms of DDA and
EA on kaolinite at 25, 35 and 45°C
Temperature R2 RMSE ST (µmol·m–2) k (L·mol–1) ΔH (kJ·mol–1)
DDA
25°C 0.951 0.372 5.2 1.0 -21.0
35°C 0.963 0.367 5.5 2.4 -20.0
45°C 0.947 0.477 6.7 0.4 -22.5
EA
25°C 0.89 0.65 7.7 0.3 -24.1
35°C 0.92 0.69 9.2 1.6 -20.0
45°C 0.85 0.66 9.5 0.7 -21.4
Table 6. Adsorption energies of the fatty amine molecules
with chain formed of 6 to 12 carbon atoms
Chain length ΔE
ads (kJ·mol–1) ΔE
disp (kJ·mol–1)
6 -74.54 -24.30
8 -71.82 -23.81
10 -72.10 -26.25
12 -73.16 -23.92
Figure 3. Influence of the chain length on the adsorption and dispersion energies and on the isosteric enthalpy
of the adsorption of a second fatty amine near the first one
Table 5. Estimation of the parameters of the temperature-dependent Langmuir fitting of the adsorption isotherms of DDA and
EA on kaolinite at 25, 35 and 45°C
Temperature R2 RMSE ST (µmol·m–2) k (L·mol–1) ΔH (kJ·mol–1)
DDA
25°C 0.951 0.372 5.2 1.0 -21.0
35°C 0.963 0.367 5.5 2.4 -20.0
45°C 0.947 0.477 6.7 0.4 -22.5
EA
25°C 0.89 0.65 7.7 0.3 -24.1
35°C 0.92 0.69 9.2 1.6 -20.0
45°C 0.85 0.66 9.5 0.7 -21.4
Table 6. Adsorption energies of the fatty amine molecules
with chain formed of 6 to 12 carbon atoms
Chain length ΔE
ads (kJ·mol–1) ΔE
disp (kJ·mol–1)
6 -74.54 -24.30
8 -71.82 -23.81
10 -72.10 -26.25
12 -73.16 -23.92
Figure 3. Influence of the chain length on the adsorption and dispersion energies and on the isosteric enthalpy
of the adsorption of a second fatty amine near the first one