2940 XXXI International Mineral Processing Congress 2024 Proceedings/Washington, DC/Sep 29–Oct 3
demonstrates that the pneumatic Imhoflot achieves a higher
grade and recovery compared to mechanical cell. It is worth
emphasising that matching the metallurgical performance
achieved in lab-scale mechanical cells to the plant-scale
mechanical cells is difficult and performance can degrade
upon scaleup. The plant tailings contain about 0.4–0.46 g/t
Au, with a significant amount of ultrafine liberated gold
that is lost to the tailings. Therefore, there is a need for a
0
10
20
30
40
50
60
70
80
0 5 10 15 20 25
Au grade, g/t
Imhoflot conc Feed grade
Figure 5. Gold grade and recovery of pilot Imhoflot test on scavenger concentrate
more efficient flotation separation reducing especially the
losses into the fines and ultra-fines.
Imhoflot G-Cell achieved an average concentrate
grade of 3.5 g/t Au (the first concentrate of cell 1 shows
an obtained Au content of about 10–15 g/t) at a recov-
ery of up to 48% (average 30%) compared to the labo-
ratory mechanical cell with 1.4 g/t at a recovery of only
10.7% (Figure 5). Also, the Imhoflot tailings contain about
4.28
12.22
15.38 15.59 17.14
32.61
35.47 36.16
63.07
52.50 53.29
26.44
4.01
2.67
2.31
2.32
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
0
10
20
30
40
50
60
70
20 20-38 38-71 71
Particle size in μm
Feed -Scav. conc Au grade Au Recovery Enrichment ratio
Figure 6. Gold grade, gold recovery and enrichment ratio size by size (average value from four
pilot test results)
Au
recovery,
%
Enrichment
rati
Au
grade
in
g
/
Au
recovery
in
%
demonstrates that the pneumatic Imhoflot achieves a higher
grade and recovery compared to mechanical cell. It is worth
emphasising that matching the metallurgical performance
achieved in lab-scale mechanical cells to the plant-scale
mechanical cells is difficult and performance can degrade
upon scaleup. The plant tailings contain about 0.4–0.46 g/t
Au, with a significant amount of ultrafine liberated gold
that is lost to the tailings. Therefore, there is a need for a
0
10
20
30
40
50
60
70
80
0 5 10 15 20 25
Au grade, g/t
Imhoflot conc Feed grade
Figure 5. Gold grade and recovery of pilot Imhoflot test on scavenger concentrate
more efficient flotation separation reducing especially the
losses into the fines and ultra-fines.
Imhoflot G-Cell achieved an average concentrate
grade of 3.5 g/t Au (the first concentrate of cell 1 shows
an obtained Au content of about 10–15 g/t) at a recov-
ery of up to 48% (average 30%) compared to the labo-
ratory mechanical cell with 1.4 g/t at a recovery of only
10.7% (Figure 5). Also, the Imhoflot tailings contain about
4.28
12.22
15.38 15.59 17.14
32.61
35.47 36.16
63.07
52.50 53.29
26.44
4.01
2.67
2.31
2.32
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
0
10
20
30
40
50
60
70
20 20-38 38-71 71
Particle size in μm
Feed -Scav. conc Au grade Au Recovery Enrichment ratio
Figure 6. Gold grade, gold recovery and enrichment ratio size by size (average value from four
pilot test results)
Au
recovery,
%
Enrichment
rati
Au
grade
in
g
/
Au
recovery
in
%