XXXI International Mineral Processing Congress 2024 Proceedings/Washington, DC/Sep 29–Oct 3 2987
had the faster flotation kinetics, while the delta is again
wider at higher pulp solids. Furthermore, the highest com-
bustible recoveries were obtained with shorter residence
time regardless of the pulp solids. The curves in cumulative
combustible recovery versus cumulative ash graphs prove
that prolonging the residence time has a positive effect on
decreasing the ash content, e.g., on selectivity.
Figure 5 displays the effect of Blast Tube residence time,
manipulated by changing the slurry flow rate, for graphite.
As can be seen from Table 1, the Blast Tube volume was the
same, high, for T3 and T5, while the flow rate was reduced
from 8 l/min to 5.2 l/min, respectively. By doing so, Blast
Tube residence time per pass was extended. Other param-
eters such as Air-to-Pulp Ratio, pulp solids, and froth depth
were kept the same. The kinetic graph shows that giving a
shorter residence time (T3) in the Blast Tube accelerates the
flotation kinetics to some extent. This finding is in line with
the outcomes of the Blast Tube capacity study. Moreover,
no matter how the residence time is modified, having a lon-
ger residence time leads to higher graphite grades.
Figure 6 shows the effect of Blast Tube residence
time, manipulated by changing the feed flow rate, for
0
10
20
30
40
50
60
70
80
90
100
0 10 20 30 40
Blast Tube residence time, s.
T6, 3,2% solids, BT (2), 4.2 l/min.
T7, 8.5% solids, BT (2), 6.2 l/min.
T9, 3.2% solids, BT (1), 4.2 l/min.
T10, 8.5% solids, BT (1), 6.2 l/min.
0
10
20
30
40
50
60
70
80
90
100
0 5 10 15 20 25 30
Cumulative Ash%
T7, BT (2)
T10, BT (1)
0
10
20
30
40
50
60
70
80
90
100
0 5 10 15 20 25 30
Cumulative Ash%
T6, BT (2)
T9, BT (1)
Figure 4. The effect of Blast Tube residence time, by changing the Blast Tube size – coal, (BT- Blast Tube)
Combustible
Recovery,
%
%yrevoceRelbitsubmoCevitalumuC
Cumulative
Combustible
Recovery
%
had the faster flotation kinetics, while the delta is again
wider at higher pulp solids. Furthermore, the highest com-
bustible recoveries were obtained with shorter residence
time regardless of the pulp solids. The curves in cumulative
combustible recovery versus cumulative ash graphs prove
that prolonging the residence time has a positive effect on
decreasing the ash content, e.g., on selectivity.
Figure 5 displays the effect of Blast Tube residence time,
manipulated by changing the slurry flow rate, for graphite.
As can be seen from Table 1, the Blast Tube volume was the
same, high, for T3 and T5, while the flow rate was reduced
from 8 l/min to 5.2 l/min, respectively. By doing so, Blast
Tube residence time per pass was extended. Other param-
eters such as Air-to-Pulp Ratio, pulp solids, and froth depth
were kept the same. The kinetic graph shows that giving a
shorter residence time (T3) in the Blast Tube accelerates the
flotation kinetics to some extent. This finding is in line with
the outcomes of the Blast Tube capacity study. Moreover,
no matter how the residence time is modified, having a lon-
ger residence time leads to higher graphite grades.
Figure 6 shows the effect of Blast Tube residence
time, manipulated by changing the feed flow rate, for
0
10
20
30
40
50
60
70
80
90
100
0 10 20 30 40
Blast Tube residence time, s.
T6, 3,2% solids, BT (2), 4.2 l/min.
T7, 8.5% solids, BT (2), 6.2 l/min.
T9, 3.2% solids, BT (1), 4.2 l/min.
T10, 8.5% solids, BT (1), 6.2 l/min.
0
10
20
30
40
50
60
70
80
90
100
0 5 10 15 20 25 30
Cumulative Ash%
T7, BT (2)
T10, BT (1)
0
10
20
30
40
50
60
70
80
90
100
0 5 10 15 20 25 30
Cumulative Ash%
T6, BT (2)
T9, BT (1)
Figure 4. The effect of Blast Tube residence time, by changing the Blast Tube size – coal, (BT- Blast Tube)
Combustible
Recovery,
%
%yrevoceRelbitsubmoCevitalumuC
Cumulative
Combustible
Recovery
%