3140 XXXI International Mineral Processing Congress 2024 Proceedings/Washington, DC/Sep 29–Oct 3
studying the change of the zeta potential of mineral sur-
face before and after the reaction with different reagents
could analyze the mechanism between reagents and mineral
surface.
The zeta potential of galena surface in the presence of
different reagents is measured and the results are shown in
Figure 5. As illustrated in Figure 5, the zeta potential of
galena decreased with the increase of pulp pH with or with-
out the reagents. The isoelectric point of pure galena was
about pH 7, which was consistent with the results of previ-
ous studies[30]. When pH 7, the galena surface was posi-
tively charged and the zeta potential of galena had negative
shift after adding the anionic reagents of DDTC or NaHA,
indicating that the electrostatic attraction between the
reagent and the galena surface reduced the zeta potential of
galena surface. When pH 7, the galena surface was nega-
tively charged, and the zeta potential of the galena surface
decreased after adding the reagents, indicating that there
were other forms of interaction between the reagents and
the galena surface in addition to electrostatic interaction,
such as the chemical adsorption. At pH 9, the zeta poten-
tial of pure galena was –7.92mV and the zeta potential of
galena moved negatively to –21.31mV after in the pres-
ence collector DDTC, demonstrating that the collector was
adsorbed on the galena surface. The zeta potential of galena
was –52.05mV when the combined depressants Ca2+ and
NaHA were added in sequence at pH 9. Compared with
the pure galena surface, the zeta potential of galena shifted
negatively by 44.13mV after the addition of combined
depressants, indicating that the combined depressants were
adsorbed on the surface of galena. When combined depres-
sants and collector were presence at the same time, the zeta
potential of galena was –63.15mV at pH 9, which was
negative than that in the presence of combined depressants
alone. The collector could be adsorbed on the galena sur-
face after reacting with combined depressants. Therefore,
combined depressants had little depression effect on galena.
The zeta potential of pyrite surface in the presence of
different reagents is measured and the results are shown in
Figure 6. The zeta potential of pyrite decreased with the
increase of pulp pH with or without the reagents. The iso-
electric point of pure pyrite was about pH 6.3, which was
agreement with the previous studies[31,32].
At pH 9, the zeta potential of pure pyrite was
–22.08mV and the zeta potential of pyrite moved nega-
tively to –26.91mV after in the presence collector DDTC,
demonstrating that the collector was adsorbed on the pyrite
surface. The zeta potential of pyrite was –54.03mV when
the combined depressants Ca2+ and NaHA were added in
sequence at pH 9. Compared with the pure pyrite surface,
the zeta potential of pyrite shifted negatively by 31.95mV
after the addition of combined depressants, indicating that
the combined depressants were adsorbed on the surface
of pyrite. When combined depressants and collector were
presence at the same time, the zeta potential of pyrite was
–57.19mV at pH 9, which had a negative shift of 3.17mV
compared with the combined depressants alone. The
adsorption of collector DDTC on the surface of pyrite was
greatly reduced after reacting with combined depressants.
The results showed that the combined depressants Ca2+
4 6 8 10 12
-60
-40
-20
0
20
Galena
Galena+DDTC
Galena+Ca2++NaHA
Galena+Ca2++NaHA+DDTC
pH
Figure 5. The zeta potential of galena surface in the presence
of different reagents
4 6 8 10 12
-60
-40
-20
0
20
Pyrite
Pyrite+DDTC
Pyrite+Ca2++NaHA
Pyrite+Ca2++NaHA+DDTC
pH
Figure 6. The zeta potential of pyrite surface in the presence
of different reagents
Zeta
potential
(mV)
Zetpotential
a
(mV)
studying the change of the zeta potential of mineral sur-
face before and after the reaction with different reagents
could analyze the mechanism between reagents and mineral
surface.
The zeta potential of galena surface in the presence of
different reagents is measured and the results are shown in
Figure 5. As illustrated in Figure 5, the zeta potential of
galena decreased with the increase of pulp pH with or with-
out the reagents. The isoelectric point of pure galena was
about pH 7, which was consistent with the results of previ-
ous studies[30]. When pH 7, the galena surface was posi-
tively charged and the zeta potential of galena had negative
shift after adding the anionic reagents of DDTC or NaHA,
indicating that the electrostatic attraction between the
reagent and the galena surface reduced the zeta potential of
galena surface. When pH 7, the galena surface was nega-
tively charged, and the zeta potential of the galena surface
decreased after adding the reagents, indicating that there
were other forms of interaction between the reagents and
the galena surface in addition to electrostatic interaction,
such as the chemical adsorption. At pH 9, the zeta poten-
tial of pure galena was –7.92mV and the zeta potential of
galena moved negatively to –21.31mV after in the pres-
ence collector DDTC, demonstrating that the collector was
adsorbed on the galena surface. The zeta potential of galena
was –52.05mV when the combined depressants Ca2+ and
NaHA were added in sequence at pH 9. Compared with
the pure galena surface, the zeta potential of galena shifted
negatively by 44.13mV after the addition of combined
depressants, indicating that the combined depressants were
adsorbed on the surface of galena. When combined depres-
sants and collector were presence at the same time, the zeta
potential of galena was –63.15mV at pH 9, which was
negative than that in the presence of combined depressants
alone. The collector could be adsorbed on the galena sur-
face after reacting with combined depressants. Therefore,
combined depressants had little depression effect on galena.
The zeta potential of pyrite surface in the presence of
different reagents is measured and the results are shown in
Figure 6. The zeta potential of pyrite decreased with the
increase of pulp pH with or without the reagents. The iso-
electric point of pure pyrite was about pH 6.3, which was
agreement with the previous studies[31,32].
At pH 9, the zeta potential of pure pyrite was
–22.08mV and the zeta potential of pyrite moved nega-
tively to –26.91mV after in the presence collector DDTC,
demonstrating that the collector was adsorbed on the pyrite
surface. The zeta potential of pyrite was –54.03mV when
the combined depressants Ca2+ and NaHA were added in
sequence at pH 9. Compared with the pure pyrite surface,
the zeta potential of pyrite shifted negatively by 31.95mV
after the addition of combined depressants, indicating that
the combined depressants were adsorbed on the surface
of pyrite. When combined depressants and collector were
presence at the same time, the zeta potential of pyrite was
–57.19mV at pH 9, which had a negative shift of 3.17mV
compared with the combined depressants alone. The
adsorption of collector DDTC on the surface of pyrite was
greatly reduced after reacting with combined depressants.
The results showed that the combined depressants Ca2+
4 6 8 10 12
-60
-40
-20
0
20
Galena
Galena+DDTC
Galena+Ca2++NaHA
Galena+Ca2++NaHA+DDTC
pH
Figure 5. The zeta potential of galena surface in the presence
of different reagents
4 6 8 10 12
-60
-40
-20
0
20
Pyrite
Pyrite+DDTC
Pyrite+Ca2++NaHA
Pyrite+Ca2++NaHA+DDTC
pH
Figure 6. The zeta potential of pyrite surface in the presence
of different reagents
Zeta
potential
(mV)
Zetpotential
a
(mV)