3142 XXXI International Mineral Processing Congress 2024 Proceedings/Washington, DC/Sep 29–Oct 3
adsorption on the surface of pyrite and the adsorption was
strong, so it had a strong depression on pyrite.
Adsorption Tests
The effect of pH on Ca2+ concentration in solution with
or without NaHA is studied and the results illustrated in
Figure 11. As illustrated in Figure 11, the concentration of
Ca2+ in solution decreased with the increase of pulp pH,
which was caused by the formation of different hydroxyl
complexes of Ca2+ in solution with the increase of pulp
pH. The Ca2+ concentration in the galena pulp was higher
than that in pyrite pulp, indicating that more Ca2+ were
absorbed on the surface of pyrite compared with galena.
For galena and pyrite, the concentration of Ca2+ in solution
decreased after the addition of NaHA, which was caused by
the NaHA complex Ca2+.
Electrochemical Tests
Galvanic corrosion occurs when galena and pyrite come
into contact with each other in the flotation process. In
generally, the oxidation of galena will be promoted and the
Pb2+ increased from galena surface at galena and pyrite cou-
ple, which could affect the flotation behavior of minerals.
Therefore, the self-corrosion and coupling corrosion elec-
trochemical parameters of galena and pyrite have been stud-
ied by Tafel polarization curve and Galvanic corrosion test.
Figure 12 showed the Tafel curves of galena and pyrite
and galvanic current and potential between galena and
pyrite couple at pH 9.18, and the results of parameter fit-
ting were shown in Table 3. As shown in Figure 12, the
self-corrosion current and self-corrosion potential of galena
were lower than that of pyrite. The coupling potential of
galena and pyrite couples was 274mV, which was between
the self-corrosion potential of galena and pyrite, and closer
to that of pyrite. The galvanic current was 4.72µA·cm–2,
which was twice the self-corrosion of galena. The results
demonstrated that the galvanic corrosion promoted the
oxidation of the anode mineral galena.
Figure 13 showed the galvanic current and potential
between galena and pyrite couple under depressant sys-
tem at pH 9.18, and the results of parameter fitting were
shown in Table 4. In the presence of depreessant NaHA,
the galvanic current decreased from 4.72 µA·cm–2 to 1.79
µA·cm–2, illustrating that the galvanic interaction between
galena and pyrite reduced with NaHA. In the presence
of depressant Ca2+ and NaHA, the galvanic interaction
0 500 1000 1500 2000 2500 3000
1000 1200 1400 1600 1800 2000
Raman shift (cm-1)
1360.57 1591.94
Pyrite+CaCl
2
+NaHA
Pyrite
Raman shift (cm-1)
342.40 382.21
1360.57
1591.94
Pyrite+CaCl
2
+NaHA
Pyrite
a
0 500 1000 1500 2000 2500 3000
b
1000 1200 1400 1600 1800 2000
Galena+CaCl
2
+NaHA
Galena
Raman shift (cm-1)
Galena+CaCl
2
+NaHA
Galena
Raman shift (cm-1)
204.32
473.61
Figure 10. Raman spectrum of minerals with and without depressant
4 6 8 10 12
1.5
2.0
2.5
3.0
3.5
4.0
Pyrite+CaCl
2
Pyrite+CaCl
2
+NaHA
Galena+CaCl
2
Galena+CaCl
2
+NaHA
pH
Figure 11. Effect of pH on Ca2+ concentration in solution
(C
(CaCl2) =4mg/L, C
(NaHA) =50mg/L)
Ca2+concentration
in
solution(mg/L)
adsorption on the surface of pyrite and the adsorption was
strong, so it had a strong depression on pyrite.
Adsorption Tests
The effect of pH on Ca2+ concentration in solution with
or without NaHA is studied and the results illustrated in
Figure 11. As illustrated in Figure 11, the concentration of
Ca2+ in solution decreased with the increase of pulp pH,
which was caused by the formation of different hydroxyl
complexes of Ca2+ in solution with the increase of pulp
pH. The Ca2+ concentration in the galena pulp was higher
than that in pyrite pulp, indicating that more Ca2+ were
absorbed on the surface of pyrite compared with galena.
For galena and pyrite, the concentration of Ca2+ in solution
decreased after the addition of NaHA, which was caused by
the NaHA complex Ca2+.
Electrochemical Tests
Galvanic corrosion occurs when galena and pyrite come
into contact with each other in the flotation process. In
generally, the oxidation of galena will be promoted and the
Pb2+ increased from galena surface at galena and pyrite cou-
ple, which could affect the flotation behavior of minerals.
Therefore, the self-corrosion and coupling corrosion elec-
trochemical parameters of galena and pyrite have been stud-
ied by Tafel polarization curve and Galvanic corrosion test.
Figure 12 showed the Tafel curves of galena and pyrite
and galvanic current and potential between galena and
pyrite couple at pH 9.18, and the results of parameter fit-
ting were shown in Table 3. As shown in Figure 12, the
self-corrosion current and self-corrosion potential of galena
were lower than that of pyrite. The coupling potential of
galena and pyrite couples was 274mV, which was between
the self-corrosion potential of galena and pyrite, and closer
to that of pyrite. The galvanic current was 4.72µA·cm–2,
which was twice the self-corrosion of galena. The results
demonstrated that the galvanic corrosion promoted the
oxidation of the anode mineral galena.
Figure 13 showed the galvanic current and potential
between galena and pyrite couple under depressant sys-
tem at pH 9.18, and the results of parameter fitting were
shown in Table 4. In the presence of depreessant NaHA,
the galvanic current decreased from 4.72 µA·cm–2 to 1.79
µA·cm–2, illustrating that the galvanic interaction between
galena and pyrite reduced with NaHA. In the presence
of depressant Ca2+ and NaHA, the galvanic interaction
0 500 1000 1500 2000 2500 3000
1000 1200 1400 1600 1800 2000
Raman shift (cm-1)
1360.57 1591.94
Pyrite+CaCl
2
+NaHA
Pyrite
Raman shift (cm-1)
342.40 382.21
1360.57
1591.94
Pyrite+CaCl
2
+NaHA
Pyrite
a
0 500 1000 1500 2000 2500 3000
b
1000 1200 1400 1600 1800 2000
Galena+CaCl
2
+NaHA
Galena
Raman shift (cm-1)
Galena+CaCl
2
+NaHA
Galena
Raman shift (cm-1)
204.32
473.61
Figure 10. Raman spectrum of minerals with and without depressant
4 6 8 10 12
1.5
2.0
2.5
3.0
3.5
4.0
Pyrite+CaCl
2
Pyrite+CaCl
2
+NaHA
Galena+CaCl
2
Galena+CaCl
2
+NaHA
pH
Figure 11. Effect of pH on Ca2+ concentration in solution
(C
(CaCl2) =4mg/L, C
(NaHA) =50mg/L)
Ca2+concentration
in
solution(mg/L)