Selective adsorption mechanism of dodecylamine on the hydrated surface of hematite and quartz

Effects of the Goethite Surface Hydration Microstructure on the Adsorption of the Collectors Dodecylamine and Sodium Oleate

“…From the comparison of adsorption energy, it is not difficult to find that both the effective components RNH 2 and RNH 3 + of DDA are difficult to form effective adsorption on the hydrated surface of goethite, which was well in agreement with the flotation results in Figure S6 and explained the practice that DDA was often used for the reverse flotation desiliconization of iron oxide minerals. , The adsorption energy of the collector DDA on the surface of hydrated quartz further confirmed the above results, and the adsorption of DDA on the hydrated surface of quartz is more favorable in thermodynamics than that of hydrated goethite. The adsorption energy of RNH 3 + on the hydrated surface of quartz was −101.6 kcal/mol, reported by Liu et al In our previous study, the adsorption energies of RNH 3 + and RNH 2 adsorbed on the hydrated surface of quartz were −51.0 and −2.8 kcal/mol, respectively, based on the same calculation parameters . The adsorption configuration of RCO 2 – on the hydrated surface of goethite is shown in Figure c.…”

“…The adsorption energy of RNH 3 + on the hydrated surface of quartz was −101.6 kcal/ mol, reported by Liu et al 10 In our previous study, the adsorption energies of RNH 3 + and RNH 2 adsorbed on the hydrated surface of quartz were −51.0 and −2.8 kcal/mol, respectively, based on the same calculation parameters. 24 The adsorption configuration of RCO 2 − on the hydrated surface of goethite is shown in Figure 7c. The O atom in RCO 2 − and the H atom of the hydrated surface formed two strong hydrogen bonds with bond lengths of 1.42 and 1.71 Å, respectively, and the corresponding adsorption energy is −77.6 kcal/mol.…”

“…Also, neutral conditions were considered in the study of the separation mechanism of hematite and quartz with DDA as the collector. 24 In the goethite flotation system theory simulation, Rath et al 25 studied the adsorption of OL on the clean surfaces of hematite, magnetite, and goethite based on density functional theory (DFT) calculations, which filled the theory blank of the interface interaction between the goethite surface and flotation reagents. However, to the best of our knowledge, there are few studies about the effects of the goethite surface hydration microstructure on the adsorption of collectors.…”

“…simulated the adsorption process of polyamine derivatives on the hydration interface of hematite under acidic conditions. Also, neutral conditions were considered in the study of the separation mechanism of hematite and quartz with DDA as the collector . In the goethite flotation system theory simulation, Rath et al studied the adsorption of OL on the clean surfaces of hematite, magnetite, and goethite based on density functional theory (DFT) calculations, which filled the theory blank of the interface interaction between the goethite surface and flotation reagents.…”

Iron ore production using a new Gemini surfactant at 273 K

“…Secondly, analysis of characteristic FTIR spectral peaks was used to distinguish the types of minerals amenable to adsorbing BDB, as such a study was previously shown to be possible for BDB and DA. 47 According to the FTIR spectroscopy analysis of BDB, the bands located at 2924 cm −1 and 2852 cm −1 were assigned to the –CH 2 symmetric and asymmetric stretchings, 11 and another band located at 1471 cm −1 corresponded to –CN stretching vibration. 48 The FTIR spectra of quartz and magnetite, each with and without interaction with BDB, are displayed in Fig.…”