XXXI International Mineral Processing Congress 2024 Proceedings/Washington, DC/Sep 29–Oct 3 3099
The experimental design for the combination PAX-
Promoter and their dose levels within the optimization trials
is depicted in Figure 6. The PAX dose levels are always kept
at three levels 280, 380 and 480 g/t. The scheme involves 4
points of high and low dosage collector and promoter, with
the addition of a fifth point of high promoter/low collector
dosage (low-right). For a sake of better visualization a sixth
point (central) indicates the initial tests dose levels.
The central point dose levels for the three Hostaflot
reagents is identical to the one for the initial tests. The low
and high dosages for the promoters are selected based on
their respective data sheets. The DP-OMC-1127 levels vary
since their initial case dose is lower compared to the other
promoters and the base-case (Aero-238). Moreover, the
DP-OMC-1127 gave a recovery similar to that of Aero-238
during initial testing, therefore in view of eventual indus-
trial application of this reagent, improved performance
could be expected at higher dosage. No particular differ-
ence in the visual appearance of the froth has been noted
during the tests with the various promoters.
Dose Levels Optimization
The results from the four reagents comparative performance
are illustrated in Figure 7. The recovery of gold is visualized
in a 3D view depicting the 5 “optimization” tests from the
factorial design and the test from the initial screening. Each
point is an average from a duplicate realized with both
batches of the ore.
For the DP-OMC-1127 performance, there is a clear
optimal point at an inflexion point bringing Au recovery
approaching 83.1% at 50–380 [Promoter-PAX] g/t dosage,
a slightly higher figure compared with the base case of Aero-
238 (82.8% Au recovery). On the other hand, the addi-
tional point at 50–380 [Promoter-PAX] g/t proves as not
so efficient choice, delivering the second lowest recovery of
82.0%. For the Hostaflot-10093 the highest Au recovery of
86.4% is achieved at 100–380 [Promoter-PAX] g/t dosage,
although the Au recovery increases concurrently with PAX
and promoter dosage. For these experimental trials there
is a clear trend of recovery dependence on the promoter
dosage, also considering that the second highest recovery
of 84.5% was obtained at 100–280 [Promoter-PAX] g/t.
This results supports the possibility of replacing some of the
PAX dosage with additional promoter supply.
Hostaflot-7650 reached 85.3% Au recovery at 100–
280 [Promoter-PAX] g/t dosage, which was the highest
recovery obtained. This is the only case from all testwork,
where reaching a high recovery was possible by replacing a
20, 380 50, 380
50, 280
50, 480
80, 380
80, 280
200
250
300
350
400
450
500
10 30 50 70 90
PROMOTER [G/T]
DP-OMC-1127
60, 380 100, 380
100, 280
30, 380
60, 280
60, 480
200
250
300
350
400
450
500
20 40 60 80 100 120
PROMOTER [G/T]
Hostaflot-10093
60, 380 100, 380
100, 280
30, 380
60, 280
60, 480
200
250
300
350
400
450
500
20 40 60 80 100 120
PROMOTER [G/T]
Hostaflot-7650
60, 380 100, 380
100, 280
30, 380
60, 280
60, 480
200
250
300
350
400
450
500
20 40 60 80 100 120
PROMOTER [G/T]
Hostaflot-LIB
Figure 6. Experimental design for the four best performing promoters (variation in both collector and promoters dose levels)
PAX
[G/T]
PAX
[G/T]
PAX
[G/T]
PAX
[G/T]
The experimental design for the combination PAX-
Promoter and their dose levels within the optimization trials
is depicted in Figure 6. The PAX dose levels are always kept
at three levels 280, 380 and 480 g/t. The scheme involves 4
points of high and low dosage collector and promoter, with
the addition of a fifth point of high promoter/low collector
dosage (low-right). For a sake of better visualization a sixth
point (central) indicates the initial tests dose levels.
The central point dose levels for the three Hostaflot
reagents is identical to the one for the initial tests. The low
and high dosages for the promoters are selected based on
their respective data sheets. The DP-OMC-1127 levels vary
since their initial case dose is lower compared to the other
promoters and the base-case (Aero-238). Moreover, the
DP-OMC-1127 gave a recovery similar to that of Aero-238
during initial testing, therefore in view of eventual indus-
trial application of this reagent, improved performance
could be expected at higher dosage. No particular differ-
ence in the visual appearance of the froth has been noted
during the tests with the various promoters.
Dose Levels Optimization
The results from the four reagents comparative performance
are illustrated in Figure 7. The recovery of gold is visualized
in a 3D view depicting the 5 “optimization” tests from the
factorial design and the test from the initial screening. Each
point is an average from a duplicate realized with both
batches of the ore.
For the DP-OMC-1127 performance, there is a clear
optimal point at an inflexion point bringing Au recovery
approaching 83.1% at 50–380 [Promoter-PAX] g/t dosage,
a slightly higher figure compared with the base case of Aero-
238 (82.8% Au recovery). On the other hand, the addi-
tional point at 50–380 [Promoter-PAX] g/t proves as not
so efficient choice, delivering the second lowest recovery of
82.0%. For the Hostaflot-10093 the highest Au recovery of
86.4% is achieved at 100–380 [Promoter-PAX] g/t dosage,
although the Au recovery increases concurrently with PAX
and promoter dosage. For these experimental trials there
is a clear trend of recovery dependence on the promoter
dosage, also considering that the second highest recovery
of 84.5% was obtained at 100–280 [Promoter-PAX] g/t.
This results supports the possibility of replacing some of the
PAX dosage with additional promoter supply.
Hostaflot-7650 reached 85.3% Au recovery at 100–
280 [Promoter-PAX] g/t dosage, which was the highest
recovery obtained. This is the only case from all testwork,
where reaching a high recovery was possible by replacing a
20, 380 50, 380
50, 280
50, 480
80, 380
80, 280
200
250
300
350
400
450
500
10 30 50 70 90
PROMOTER [G/T]
DP-OMC-1127
60, 380 100, 380
100, 280
30, 380
60, 280
60, 480
200
250
300
350
400
450
500
20 40 60 80 100 120
PROMOTER [G/T]
Hostaflot-10093
60, 380 100, 380
100, 280
30, 380
60, 280
60, 480
200
250
300
350
400
450
500
20 40 60 80 100 120
PROMOTER [G/T]
Hostaflot-7650
60, 380 100, 380
100, 280
30, 380
60, 280
60, 480
200
250
300
350
400
450
500
20 40 60 80 100 120
PROMOTER [G/T]
Hostaflot-LIB
Figure 6. Experimental design for the four best performing promoters (variation in both collector and promoters dose levels)
PAX
[G/T]
PAX
[G/T]
PAX
[G/T]
PAX
[G/T]