2778 XXXI International Mineral Processing Congress 2024 Proceedings/Washington, DC/Sep 29–Oct 3
from 7.2% to 9.0% (with a relative increase by 25%). In
the meantime, there was an increase in Cu recovery by
0.8 percentage point (from 94.4 to 95.2%). Both of these
increases were statistically significant with p-values being
less than 0.05.
FLOTATION TESTS AT PILOT SCALE IN
BATCH MODE
Flotation tests were conducted for a coking coal sample
using a 17-cm diameter column in batch mode, with recy-
cling the tailing stream back to the flotation column and
collecting the froth product sequentially while reducing the
froth depth through changing the position of the levelling
bucket.
Figure8a shows that the flotation kinetics with the use
of three low-power underwater loudspeakers which had
their diaphragm facing the middle and spaced equally to
each other, the cumulative combustible recovery (Rcomb)
with sound was found to be statistically significantly higher
than that without sound. Overall, the Rcomb was increased
from 41.0% to 45.2%.
Figure 8b shows that with using a relatively high power
immersible loudspeaker and with its diaphragm facing up,
at a sound frequency of 350 Hz and sound amplitude of
90 dB, the Rcomb with sound was found to be statistically
significantly higher than that without sound throughout
the flotation except the final stage (Yang et al., 2023b). The
apparent rate constant with sound was 0.078 min–1 while
without sound the rate constant was 0.064 min–1, indicat-
ing an increase in flotation rate constant by 22.4%.
Source: Yang et al., 2023b..
Source: Ng et al., 2021.
Figure 5. Coal flotation with and with sound. A loudspeaker was used above a flotation column (see Figure 2b)
0
1
2
3
4
5
6
7
8
9
10
Blank With sound
Figure 6. Effect of sound on the mass recovery of rougher flotation of a real copper ore
Mas s
recovery
(%)
from 7.2% to 9.0% (with a relative increase by 25%). In
the meantime, there was an increase in Cu recovery by
0.8 percentage point (from 94.4 to 95.2%). Both of these
increases were statistically significant with p-values being
less than 0.05.
FLOTATION TESTS AT PILOT SCALE IN
BATCH MODE
Flotation tests were conducted for a coking coal sample
using a 17-cm diameter column in batch mode, with recy-
cling the tailing stream back to the flotation column and
collecting the froth product sequentially while reducing the
froth depth through changing the position of the levelling
bucket.
Figure8a shows that the flotation kinetics with the use
of three low-power underwater loudspeakers which had
their diaphragm facing the middle and spaced equally to
each other, the cumulative combustible recovery (Rcomb)
with sound was found to be statistically significantly higher
than that without sound. Overall, the Rcomb was increased
from 41.0% to 45.2%.
Figure 8b shows that with using a relatively high power
immersible loudspeaker and with its diaphragm facing up,
at a sound frequency of 350 Hz and sound amplitude of
90 dB, the Rcomb with sound was found to be statistically
significantly higher than that without sound throughout
the flotation except the final stage (Yang et al., 2023b). The
apparent rate constant with sound was 0.078 min–1 while
without sound the rate constant was 0.064 min–1, indicat-
ing an increase in flotation rate constant by 22.4%.
Source: Yang et al., 2023b..
Source: Ng et al., 2021.
Figure 5. Coal flotation with and with sound. A loudspeaker was used above a flotation column (see Figure 2b)
0
1
2
3
4
5
6
7
8
9
10
Blank With sound
Figure 6. Effect of sound on the mass recovery of rougher flotation of a real copper ore
Mas s
recovery
(%)