1982 XXXI International Mineral Processing Congress 2024 Proceedings/Washington, DC/Sep 29–Oct 3
1623–1590 cm–1 are attributed to the chemical adsorption
of carboxyl groups [18]. As shown in Figure 8c, the absorp-
tion peak at 1081 cm–1 corresponds to the antisymmetric
stretching vibration of Si-O-Si, the peak at 778 cm–1 rep-
resents the symmetric stretching vibration of Si-O-Si, and
the peak at 694 cm–1 is related to the stretching vibration
of SiO2 [19]. The FTIR spectra indicate that the two starch
agents do not react with quartz.
Zeta Potential Testing
Zeta potential testing was employed to investigate the
interaction mechanisms of CM-CS-3 and CM-TS-1 with
two minerals. The changes in potential before and after the
interaction of two minerals with different reagents at differ-
ent pH values are depicted in Figure 9.
Figure 9a shows that the the isotropic potential (IEP) for
the specularite is approximately 4.5 [20]. When the slurry
pH value is less than 4.5, the specularite surface carries a
positive charge. Conversely, when the slurry pH exceeds
4.5, the specularite surface becomes negatively charged,
with the negative charge intensity increasing as the pH
value rises. After adding CM-CS-3 and CM-TS-1, the zeta
potential of the specularite surface shifts toward the nega-
tive direction. When the pH value is below 4.5, electrostatic
or chemical adsorption may occur between specularite and
the reagents. Conversely, when the pH value exceeds 4.5,
hydrogen bonding or chemical adsorption occurs between
specularite and the reagents. Figure 9b reveals that within
the pH range of 2 to 12, the quartz surface is negatively
charged, and the zeta potential decreases with an increase
in pH value. This phenomenon is attributed to the forma-
tion of -Si-O– structures on the surface of broken quartz.
At lower pH values, the -Si-O-H structure forms as H+ in
the water combines with the surface O atoms, resulting in a
Figure 8. FTIR spectra of two starch agents (a), specularite treated by starch agents (b), and quartz treated by starch agents (c)
1623–1590 cm–1 are attributed to the chemical adsorption
of carboxyl groups [18]. As shown in Figure 8c, the absorp-
tion peak at 1081 cm–1 corresponds to the antisymmetric
stretching vibration of Si-O-Si, the peak at 778 cm–1 rep-
resents the symmetric stretching vibration of Si-O-Si, and
the peak at 694 cm–1 is related to the stretching vibration
of SiO2 [19]. The FTIR spectra indicate that the two starch
agents do not react with quartz.
Zeta Potential Testing
Zeta potential testing was employed to investigate the
interaction mechanisms of CM-CS-3 and CM-TS-1 with
two minerals. The changes in potential before and after the
interaction of two minerals with different reagents at differ-
ent pH values are depicted in Figure 9.
Figure 9a shows that the the isotropic potential (IEP) for
the specularite is approximately 4.5 [20]. When the slurry
pH value is less than 4.5, the specularite surface carries a
positive charge. Conversely, when the slurry pH exceeds
4.5, the specularite surface becomes negatively charged,
with the negative charge intensity increasing as the pH
value rises. After adding CM-CS-3 and CM-TS-1, the zeta
potential of the specularite surface shifts toward the nega-
tive direction. When the pH value is below 4.5, electrostatic
or chemical adsorption may occur between specularite and
the reagents. Conversely, when the pH value exceeds 4.5,
hydrogen bonding or chemical adsorption occurs between
specularite and the reagents. Figure 9b reveals that within
the pH range of 2 to 12, the quartz surface is negatively
charged, and the zeta potential decreases with an increase
in pH value. This phenomenon is attributed to the forma-
tion of -Si-O– structures on the surface of broken quartz.
At lower pH values, the -Si-O-H structure forms as H+ in
the water combines with the surface O atoms, resulting in a
Figure 8. FTIR spectra of two starch agents (a), specularite treated by starch agents (b), and quartz treated by starch agents (c)