XXXI International Mineral Processing Congress 2024 Proceedings Page 2995 (3019 of 3836)

XXXI International Mineral Processing Congress 2024 Proceedings/Washington, DC/Sep 29–Oct 3 3131
17.66
21.13 20.15
22.79
72.29
82.13
80.45
85.56
0.097 0.11 0.1 0.11
63.16
67.41
63.01
65.44
None Sodium silicate Lime+Sodium silicate Lime
0.0
0.1
5
10
15
20
25
50
60
70
80
90
100
Cu grade
Cu recovery
Mo grade
Mo recovery
Figure 7. Effects of depressant types on recoveries and grades of Cu and Mo in concentrates
Ore
Roughing
70% -0.074mm
6
Cleaning¢ñ
3
Cleaning¢ó
Mid.2
4
Cleaning¢ò
3
Mid.1 Conc.
Grinding
2 NaHS 100
2 BK386 32
2 SIBX 7
2 BK233 40
Tailing
2 Lime
pH=10.00
Regrinding 81.7% -0.045mm
Figure 8. Flowchart of re-grinding fineness tests for cleaning process
Grade
/r
overy,%

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XXXI International Mineral Processing Congress 2024 Proceedings/Washington, DC/Sep 29–Oct 3 3131
17.66
21.13 20.15
22.79
72.29
82.13
80.45
85.56
0.097 0.11 0.1 0.11
63.16
67.41
63.01
65.44
None Sodium silicate Lime+Sodium silicate Lime
0.0
0.1
5
10
15
20
25
50
60
70
80
90
100
Cu grade
Cu recovery
Mo grade
Mo recovery
Figure 7. Effects of depressant types on recoveries and grades of Cu and Mo in concentrates
Ore
Roughing
70% -0.074mm
6
Cleaning¢ñ
3
Cleaning¢ó
Mid.2
4
Cleaning¢ò
3
Mid.1 Conc.
Grinding
2 NaHS 100
2 BK386 32
2 SIBX 7
2 BK233 40
Tailing
2 Lime
pH=10.00
Regrinding 81.7% -0.045mm
Figure 8. Flowchart of re-grinding fineness tests for cleaning process
Grade
/r
overy,%

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3130 XXXI International Mineral Processing Congress 2024 Proceedings/Washington, DC/Sep 29–Oct 3
significant increase. Upon surpassing 32g/t of BK386, the
Mo recovery stabilizes. The results suggest that a dosage of
32g/t BK386 is optimal for rougher flotation.
Effect of Depressant Types on Cleaning
The flowchart depicted in Figure 6 was utilized to con-
duct a test on different depressant types to evaluate their
impact on Cu concentrate. For this experiment, we selected
sodium silicate(200g/t), lime(300g/t), and a combination
of sodium silicate(200g/t) and lime(100g/t) as depressants.
The results are presented in Figure 7. These results indicate
that, compared to not adding a depressant, the addition of
lime or sodium silicate can enhance the copper grade in
the concentrate, with lime alone yielding the highest cop-
per grade. Consequently, lime is selected as the preferred
depressant.
Effect of Re-Grinding Fineness on Cleaning
The flowchart shown in Figure 8 is used to examine the
effect of re-grinding fineness on the grade of Cu in the con-
centrate, in which the amount of lime added in Cleaning 1
is 300g/t.
The results in Figure 9 show that re-grinding the
rougher concentrate can significantly improve the Cu grade
of the concentrate. As the re-grinding fineness increases,
the Cu grade also increases. When the particle size distribu-
tion exceeds 88% passing through 45 μm, the Cu grade of
the concentrate have stabilized. Therefore, the appropriate
re-grinding fineness is –45 μm acczounting for 88%.
10 20 30 40 50 60 70
0
1
2
3
4
5
6
7
8
9
10
Dosage of BK386, g/t
Cu grade
0
20
40
60
80
100
Cu recovery
(a)
20 30 40 50 60
0.00
0.02
0.04
0.06
0.08
0.10
Dosage of BK386, g/t
Mo grade
(b)
0
20
40
60
80
100
Mo recovery
Figure 5. Effects of BK386 dosage on recoveries and grades of Cu(a) and Mo(b) in rougher concentrates
Ore
Roughing
70% -0.074mm
6
Cleaning¢ñ
3
Cleaning¢ó
Mid.2
4
Cleaning¢ò
3
Mid.1 Conc.
Grinding
2 NaHS 100
2 BK386 32
2 SIBX 7
2 BK233 40
Tailing
2 Depressant
pH=10.00
Figure 6. Flowchart of depressant types tests for cleaning
process
Grade,% Recovery,% Grade,% Recovery,%

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3132 XXXI International Mineral Processing Congress 2024 Proceedings/Washington, DC/Sep 29–Oct 3
Locked-Circuit Tests
Based on the recommended flotation conditions, the
locked-circuit tests of bulk flotation were conducted using
the flowchart and reagent scheme given in Figure 10. The
results of locked-circuit test are shown in Table 2.
As seen from Table 2, the results demonstrate that
BK386 exhibits good adaptability to this ore sample. It
enables the production of a bulk concentrate with a Cu
grade of 28.95%, Cu recovery rate of 90.33%, Mo grade of
0.15%, and Mo recovery rate of 72.7%, thereby achieving
60 65 70 75 80 85 90 95
20
22
24
26
28
30
32
34
Cu grade
0
20
40
60
80
100
Cu recovery
(a)
60 65 70 75 80 85 90 95
0.00
0.02
0.04
0.06
0.08
0.10
0.12
0.14
0.16
Mo grade
(b)
0
20
40
60
80
100
Mo recovery
Figure 9. Effects ofre-grinding fineness on recoveries and grades of Cu(a) and Mo(b) in concentrates
Ore
Roughing
70% -0.074mm
6
Cleaning¢ñ
3
Cleaning ¢ó
4
Cleaning¢ò
Grinding
2 NaHS 100
2 BK386 32
2 SIBX 7
2 BK233 40
Tailing 1
Regrinding
Conc.
3
Tailing 2
Scavenging for cleaning
3
87.1% -0.045mm
Figure 10. Flowchart of locked circuit flotation tests
Grade,% Recovery,% Grade,% Recovery,%

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