2308 XXXI International Mineral Processing Congress 2024 Proceedings/Washington, DC/Sep 29–Oct 3
the last two peaks refer to the stretching vibrations of P-O
(Cao et al., 2015). In the pure quartz spectrum, the bands
at 693 cm–1, 795 cm–1 and 1048 cm–1 are assigned respec-
tively to the stretching vibration of Si-O-Si groups and the
bending vibration of Si-O group (Liu et al., 2020 Wang et
al., 2021). New peaks associated with FAC were detected
in the spectra of the studied minerals after the treatment.
These peaks are located between the region 1400 cm–1 and
1750 cm–1. Particularly, the peak near 1558 cm–1, which
is indicative of the stretching vibration of COO–, was
replaced by peaks at 1572 cm–1 and 1536 cm–1. The occur-
rence of these two peaks is indicative of the physisorption
of high concentrations of dicarboxylate salts onto the sur-
face of the minerals under investigation. In the case of treat-
ment using low concentrations of the anionic collector, the
peak related to fatty acid collectors’ adsorption is detected
near 1550cm–1. According to some investigations, this is
explained by the chemical adsorption of the collectors onto
the surfaces of apatite, calcite, and dolomite via their Ca2+
sites (Foucaud et al., 2021). The peaks exhibited much
greater intensities in the case of calcium bearing miner-
als as compared to quartz. This difference may be ascribed
to the lack of active sites for adsorption on the surface of
quartz, resulting in the significant absence of these peaks.
Furthermore, distinct peaks representing the hydrocarbon
chain were observed in the range of 2800 cm–1 to 3050
cm–1, specifically indicating the presence of =C-H cis- and
-C-H (CH2-CH3) bonds on the surface of the examined
minerals. Quartz had the lowest intensities for these peaks
associated with hydrocarbon chains.
Figure 8. Zeta potential measurements of apatite and quartz as function of pH, FrOC, ROC, MOC as function of pH, and
fluorapatite and quartz respectively after contact with FACs as function of concentration
the last two peaks refer to the stretching vibrations of P-O
(Cao et al., 2015). In the pure quartz spectrum, the bands
at 693 cm–1, 795 cm–1 and 1048 cm–1 are assigned respec-
tively to the stretching vibration of Si-O-Si groups and the
bending vibration of Si-O group (Liu et al., 2020 Wang et
al., 2021). New peaks associated with FAC were detected
in the spectra of the studied minerals after the treatment.
These peaks are located between the region 1400 cm–1 and
1750 cm–1. Particularly, the peak near 1558 cm–1, which
is indicative of the stretching vibration of COO–, was
replaced by peaks at 1572 cm–1 and 1536 cm–1. The occur-
rence of these two peaks is indicative of the physisorption
of high concentrations of dicarboxylate salts onto the sur-
face of the minerals under investigation. In the case of treat-
ment using low concentrations of the anionic collector, the
peak related to fatty acid collectors’ adsorption is detected
near 1550cm–1. According to some investigations, this is
explained by the chemical adsorption of the collectors onto
the surfaces of apatite, calcite, and dolomite via their Ca2+
sites (Foucaud et al., 2021). The peaks exhibited much
greater intensities in the case of calcium bearing miner-
als as compared to quartz. This difference may be ascribed
to the lack of active sites for adsorption on the surface of
quartz, resulting in the significant absence of these peaks.
Furthermore, distinct peaks representing the hydrocarbon
chain were observed in the range of 2800 cm–1 to 3050
cm–1, specifically indicating the presence of =C-H cis- and
-C-H (CH2-CH3) bonds on the surface of the examined
minerals. Quartz had the lowest intensities for these peaks
associated with hydrocarbon chains.
Figure 8. Zeta potential measurements of apatite and quartz as function of pH, FrOC, ROC, MOC as function of pH, and
fluorapatite and quartz respectively after contact with FACs as function of concentration