2988 XXXI International Mineral Processing Congress 2024 Proceedings/Washington, DC/Sep 29–Oct 3
metallurgical coal. The Blast Tube size of 1 (low volume)
was used for the shown test works. The feed flow rate was
changed from 6 l/min to 4.2 l/min and therefore, the resi-
dence time per pass was changed in the same ratio for T8
and T9, respectively. The rest of the operating conditions
were kept the same. As a result of extending the residence
time, the flotation kinetics get slower which supports the
conclusion made from Figure 4 kinetic graphs. For the low
combustible recoveries ash contents seem to be quite close,
nevertheless, as the combustible recoveries go higher with
increasing flotation time the selectivity against ash slightly
gets better in T8. The reason could be attributed to very
low pulp solids as was observed previously.
The Effect of Pulp Solids
Since Concorde Cell is a new technology, there is a need
for more research to determine the degree of effect of
main flotation parameters which had a proven impact on
0
10
20
30
40
50
60
70
80
90
100
0 5 10 15 20 25 30
Blastt Tube residence time, s.
T3, 5% solids, BT (2), 8 l/min.
T5, 5% solids, BT (2), 5.2 l/min.
72
74
76
78
80
82
84
86
0 10 20 30 40 50 60 70 80 90 100
Carbon Recovery, %
Figure 5. The effect of Blast Tube residence time, by changing the flowrate—graphite, (BT- Blast Tube)
0
10
20
30
40
50
60
70
80
90
100
0 5 10 15 20
Blast Tube residence time, s.
T8, 3.2% solids, BT (1), 4.2 l/min
T9, 3.2% solids, BT (1), 6.2 l/min.
0
10
20
30
40
50
60
70
80
90
100
0 5 10 15 20 25
Cumulative Ash%
Figure 6. The effect of Blast Tube residence time, by changing the flowrate—of metallurgical coal, (BT- Blast Tube)
Carbon
Recovery
%
Carbon
Grade,
%
%,yrevoceRelbitsubmoC
Cumulative
Combustible
Recovery
%