XXXI International Mineral Processing Congress 2024 Proceedings/Washington, DC/Sep 29–Oct 3 3139
results are shown in the Figure 4. The results shown that the
reagent addition order of CaCl2 and NaHA had an effect
on the flotation recovery of galena and pyrite. When com-
bined depressants CaCl2 and NaHA were added in sequence
and CaCl2 and NaHA were added at the same time, the
recoveries of galena and pyrite were similar with pH. The
recovery of galena first increased and then decreased, and
the recovery of pyrite gradually decreased with the increase
of pH. Compared with the combined depressants CaCl2
and NaHA were added in sequence and CaCl2 and NaHA
were added at the same time, the recoveries of galena and
pyrite were increased under the condition of NaHA and
CaCl2 were added in sequence. The depression ability to
pyrite was weak when the combined depressants CaCl2 and
NaHA mixed first and then added, the recovery of pyrite
was between 30% and 40% in the pH range 6~10. The flo-
tation results shown that the separation effect of galena and
pyrite was the best when the combined depressants CaCl2
and NaHA were added in sequence, which could realize the
effective separation of galena and pyrite under the condi-
tion of low alkaline.
To evaluate the effect of combined depressant Ca2+ and
NaHA, the tests of the artificial mixed mineral of galena
and pyrite were carried out at pH 9. The dosage of Ca2+
and NaHA were 4 mg/L and 50 mg/L and table 2 showed
the results of the artificial mixed mineral. From Table 2, in
the presence of combined depressant Ca2+ and NaHA, the
Pb concentrate with a recovery of 84.41% Pb and 19.49%
Fe, a grade of 65.82% Pb and 8.13% Fe was obtained.
Through the artificial mixed minerals experiment results,
Ca2+ and NaHA could used as a effectively depressant in
the flotation of galena and pyrite.
Zeta Potential Experiment Results
Zeta potential is an important electrical parameter of min-
eral interface double layer. Mineral particles will interact
with various reagents in the flotation pulp, which will
change the zeta potential of mineral surface[29]. Therefore,
4 6 8 10 12
0
20
40
60
80
100
Galena+CaCl
2
+NaHA+DDTC
Pyrite+CaCl
2
+NaHA+DDTC
Galena+NaHA+CaCl
2
+DDTC
Pyrite+NaHA+CaCl
2
+DDTC
Galena+CaCl
2
/NaHA+DDTC
Pyrite+CaCl
2
/NaHA+DDTC
pH
Figure 4. Effect of reagent addition order on the flotation of galena and pyrite (‘+’
denotes that two reagents are added in sequence, and ‘/’ denotes that two reagents are
added at the same time.)
Table 2. Flotation results of galena-pyrite artificial mixed minerals
Products Yield, %
Grade, %Recovery, %
Pb Fe Pb Fe
Pb concentrate 53.86 65.82 8.13 84.41 19.49
S concentrate 46.14 14.19 39.21 15.59 80.51
Feed 100.00 42.00 22.47 100.00 100.00
Recovery/%
results are shown in the Figure 4. The results shown that the
reagent addition order of CaCl2 and NaHA had an effect
on the flotation recovery of galena and pyrite. When com-
bined depressants CaCl2 and NaHA were added in sequence
and CaCl2 and NaHA were added at the same time, the
recoveries of galena and pyrite were similar with pH. The
recovery of galena first increased and then decreased, and
the recovery of pyrite gradually decreased with the increase
of pH. Compared with the combined depressants CaCl2
and NaHA were added in sequence and CaCl2 and NaHA
were added at the same time, the recoveries of galena and
pyrite were increased under the condition of NaHA and
CaCl2 were added in sequence. The depression ability to
pyrite was weak when the combined depressants CaCl2 and
NaHA mixed first and then added, the recovery of pyrite
was between 30% and 40% in the pH range 6~10. The flo-
tation results shown that the separation effect of galena and
pyrite was the best when the combined depressants CaCl2
and NaHA were added in sequence, which could realize the
effective separation of galena and pyrite under the condi-
tion of low alkaline.
To evaluate the effect of combined depressant Ca2+ and
NaHA, the tests of the artificial mixed mineral of galena
and pyrite were carried out at pH 9. The dosage of Ca2+
and NaHA were 4 mg/L and 50 mg/L and table 2 showed
the results of the artificial mixed mineral. From Table 2, in
the presence of combined depressant Ca2+ and NaHA, the
Pb concentrate with a recovery of 84.41% Pb and 19.49%
Fe, a grade of 65.82% Pb and 8.13% Fe was obtained.
Through the artificial mixed minerals experiment results,
Ca2+ and NaHA could used as a effectively depressant in
the flotation of galena and pyrite.
Zeta Potential Experiment Results
Zeta potential is an important electrical parameter of min-
eral interface double layer. Mineral particles will interact
with various reagents in the flotation pulp, which will
change the zeta potential of mineral surface[29]. Therefore,
4 6 8 10 12
0
20
40
60
80
100
Galena+CaCl
2
+NaHA+DDTC
Pyrite+CaCl
2
+NaHA+DDTC
Galena+NaHA+CaCl
2
+DDTC
Pyrite+NaHA+CaCl
2
+DDTC
Galena+CaCl
2
/NaHA+DDTC
Pyrite+CaCl
2
/NaHA+DDTC
pH
Figure 4. Effect of reagent addition order on the flotation of galena and pyrite (‘+’
denotes that two reagents are added in sequence, and ‘/’ denotes that two reagents are
added at the same time.)
Table 2. Flotation results of galena-pyrite artificial mixed minerals
Products Yield, %
Grade, %Recovery, %
Pb Fe Pb Fe
Pb concentrate 53.86 65.82 8.13 84.41 19.49
S concentrate 46.14 14.19 39.21 15.59 80.51
Feed 100.00 42.00 22.47 100.00 100.00
Recovery/%