XXXI International Mineral Processing Congress 2024 Proceedings/Washington, DC/Sep 29–Oct 3 2779
Figure 9 shows the yield-ash curve of the flotation tests
at pilot scale with and without sound (using the data corre-
sponding to the same experiments as reported in Figure 8b).
The results are consistent with the lab-scale test results
shown in Figure 5b that use of sound could improve coal
cleaning, especially reduce product ash content (increase
the product grade) without losing flotation recovery (Yang
et al., 2023b).
FLOTATION TESTS AT PILOT SCALE IN
SEMI-CONTINUOUS MODE
Flotation tests for a coking coal sample (250 microns)
obtained from a different mine site were also conducted
using the 17-cm diameter column in semi-continuous
mode, with recycling both the concentrate and the tailing
streams back to the flotation column. Figure 10 schemati-
cally shows the flotation system. Only several flotation tests
Figure 7. Schematic of the experimental setup used to conduct the flotation tests at pilot scale in
batch mode. The tailing stream was sent back to the feed sump. Loudspeakers were placed within
the flotation cell, 1–2 cm below the pulp/froth interface
Figure 8. Pilot scale flotation tests for a coking coal sample: a) three underwater speakers (5 W each), b) one underwater
speaker (30 W). All loudspeakers were placed 1–2 cm below the pulp/froth interface
Figure 9 shows the yield-ash curve of the flotation tests
at pilot scale with and without sound (using the data corre-
sponding to the same experiments as reported in Figure 8b).
The results are consistent with the lab-scale test results
shown in Figure 5b that use of sound could improve coal
cleaning, especially reduce product ash content (increase
the product grade) without losing flotation recovery (Yang
et al., 2023b).
FLOTATION TESTS AT PILOT SCALE IN
SEMI-CONTINUOUS MODE
Flotation tests for a coking coal sample (250 microns)
obtained from a different mine site were also conducted
using the 17-cm diameter column in semi-continuous
mode, with recycling both the concentrate and the tailing
streams back to the flotation column. Figure 10 schemati-
cally shows the flotation system. Only several flotation tests
Figure 7. Schematic of the experimental setup used to conduct the flotation tests at pilot scale in
batch mode. The tailing stream was sent back to the feed sump. Loudspeakers were placed within
the flotation cell, 1–2 cm below the pulp/froth interface
Figure 8. Pilot scale flotation tests for a coking coal sample: a) three underwater speakers (5 W each), b) one underwater
speaker (30 W). All loudspeakers were placed 1–2 cm below the pulp/froth interface