1 Introduction
2 Experimentation
2.1 Triboelectrostatic Belt Separator
3 Sample Characterisation
Batch A | Batch B | |||||
---|---|---|---|---|---|---|
Fraction | MgO | CaO | SiO2 | MgO | CaO | SiO2 |
[µm] | [%] | [%] | [%] | [%] | [%] | [%] |
>100 | 51.25 | 20.06 | 9.15 | 61.40 | 12.90 | 6.60 |
100/80 | 63.01 | 10.13 | 6.25 | 72.20 | 7.30 | 4.20 |
80/63 | 75.15 | 7.38 | 5.07 | 78.00 | 6.20 | 2.60 |
63/40 | 83.48 | 4.37 | 2.93 | 81.70 | 4.10 | 2.90 |
40/0 | 85.77 | 3.63 | 2.86 | 84.10 | 3.40 | 2.90 |
4 Influence of the Sample History
Storage condition number | Time [h] | Temperature [°C] | Relative humidity [%] | Location |
---|---|---|---|---|
1 | 100 | 25 | 40 | Open in the lab |
2 | 100 | 80 | 0 | Drying oven |
3 | 100 | 20 | 25 | Climatic chamber |
Batch/storage condition | Product | Recovery | SiO2 | CaO | MgO | |||
---|---|---|---|---|---|---|---|---|
[%] | g [%] | ri [%] | g [%] | ri [%] | g [%] | ri [%] | ||
Batch A | ||||||||
Storage condition nr. 1 | E1 (tailings) | 14.3 | 8.4 | 65.9 | 4.7 | 13.6 | 76.2 | 13.3 |
E2 (concentrate) | 85.7 | 0.7 | 34.1 | 4.9 | 86.4 | 82.9 | 86.7 | |
Feed | 100.0 | 1.8 | 100.0 | 4.9 | 100.0 | 81.9 | 100.0 | |
Storage condition nr. 2 | E1 (tailings) | 14.4 | 16.9 | 78.0 | 3.5 | 10.8 | 70.5 | 12.4 |
E2 (concentrate) | 85.6 | 0.8 | 22.0 | 4.9 | 89.2 | 84.0 | 87.6 | |
Feed | 100.0 | 3.1 | 100.0 | 4.7 | 100.0 | 82.0 | 100.0 | |
Storage condition nr. 3 | E1 (tailings) | 15.1 | 15.4 | 79.4 | 4.6 | 14.5 | 69.8 | 12.9 |
E2 (concentrate) | 84.9 | 0.7 | 20.6 | 4.8 | 85.5 | 83.5 | 87.1 | |
Feed | 100.0 | 2.9 | 100.0 | 4.8 | 100.0 | 81.4 | 100.0 | |
Batch B | ||||||||
Storage condition nr. 1 | E1 (tailings) | 29.3 | 8.7 | 83.5 | 5.7 | 32.4 | 74.4 | 27.0 |
E2 (concentrate) | 70.7 | 0.7 | 16.5 | 5.0 | 67.6 | 83.7 | 73.0 | |
Feed | 100.0 | 3.0 | 100.0 | 5.2 | 100.0 | 81.0 | 100.0 | |
Storage condition nr. 2 | E1 (tailings) | 13.4 | 18.2 | 81.7 | 4.0 | 10.3 | 68.8 | 11.3 |
E2 (concentrate) | 86.6 | 0.6 | 18.3 | 5.4 | 89.7 | 84.0 | 88.7 | |
Feed | 100.0 | 3.0 | 100.0 | 5.2 | 100.0 | 82.0 | 100.0 | |
Storage condition nr. 3 | E1 (tailings) | 17.4 | 14.3 | 81.4 | 5.7 | 18.6 | 67.4 | 14.5 |
E2 (concentrate) | 82.6 | 0.7 | 18.6 | 5.3 | 81.4 | 83.7 | 85.5 | |
Feed | 100.0 | 3.1 | 100.0 | 5.3 | 100.0 | 80.9 | 100.0 |
5 Separation Tests with Decreasing Feed Temperature
Batch | Product | Recovery | SiO2 | CaO | MgO | |||
---|---|---|---|---|---|---|---|---|
[%] | g [%] | ri [%] | g [%] | ri [%] | g [%] | ri [%] | ||
Batch A | E1 (tailings) | 11.4 | 18.3 | 75.4 | 3.9 | 9.5 | 68.7 | 9.5 |
E2 (concentrate) | 88.6 | 0.8 | 24.6 | 4.8 | 90.5 | 84.1 | 90.5 | |
Feed | 100.0 | 2.8 | 100.0 | 4.7 | 100.0 | 82.3 | 100.0 | |
E1 (tailings) | 10.9 | 18.5 | 73.9 | 4.1 | 9.1 | 68.2 | 9.1 | |
E2 (concentrate) | 89.1 | 0.8 | 26.1 | 5.0 | 90.9 | 83.5 | 91.0 | |
Feed | 100.0 | 2.7 | 100.0 | 4.9 | 100.0 | 81.8 | 100.0 | |
Batch B | E1 (tailings) | 9.8 | 21.7 | 75.0 | 3.6 | 6.9 | 66.2 | 7.9 |
E2 (concentrate) | 90.2 | 0.8 | 25.0 | 5.2 | 93.1 | 83.9 | 92.1 | |
Feed | 100.0 | 2.8 | 100.0 | 5.1 | 100.0 | 82.2 | 100.0 | |
E1 (tailings) | 9.9 | 21.5 | 75.7 | 3.6 | 6.9 | 66.4 | 8.0 | |
E2 (concentrate) | 90.1 | 0.8 | 24.3 | 5.3 | 93.1 | 83.8 | 92.0 | |
Feed | 100.0 | 2.8 | 100.0 | 5.1 | 100.0 | 82.0 | 100.0 |
5.1 Separation Test with Gradual Increase of Voltage
Applied voltage | Product | Recovery | SiO2 | CaO | MgO | |||
---|---|---|---|---|---|---|---|---|
[%] | g [%] | ri [%] | g [%] | ri [%] | g [%] | ri [%] | ||
1 kV | E1 (tailings) | 29.6 | 8.9 | 84.0 | 4.3 | 27.2 | 77.1 | 27.8 |
E2 (concentrate) | 70.4 | 0.7 | 16.0 | 4.8 | 72.8 | 84.1 | 72.2 | |
Feed | 100.0 | 3.1 | 100.0 | 4.6 | 100.0 | 82.1 | 100.0 | |
2 kV | E1 (tailings) | 24.5 | 10.3 | 77.6 | 4.1 | 21.5 | 75.9 | 22.7 |
E2 (concentrate) | 75.5 | 0.7 | 16.1 | 4.9 | 78.5 | 84.1 | 77.3 | |
Feed | 100.0 | 3.3 | 100.0 | 4.7 | 100.0 | 82.1 | 100.0 | |
3 kV | E1 (tailings) | 21.1 | 12.2 | 79.1 | 4.1 | 19.1 | 74.1 | 19.0 |
E2 (concentrate) | 78.9 | 0.9 | 20.9 | 4.6 | 80.9 | 84.2 | 81.0 | |
Feed | 100.0 | 3.3 | 100.0 | 4.5 | 100.0 | 82.1 | 100.0 | |
4 kV | E1 (tailings) | 14.2 | 16.1 | 79.4 | 3.7 | 11.2 | 71.0 | 12.3 |
E2 (concentrate) | 85.8 | 0.7 | 20.6 | 4.8 | 88.8 | 84.4 | 87.7 | |
Feed | 100.0 | 2.9 | 100.0 | 4.7 | 100.0 | 82.5 | 100.0 | |
5 kV | E1 (tailings) | 14.2 | 15.8 | 80.8 | 3.8 | 11.5 | 71.1 | 12.2 |
E2 (concentrate) | 85.8 | 0.6 | 19.2 | 4.8 | 88.5 | 84.2 | 87.8 | |
Feed | 100.0 | 2.8 | 100.0 | 4.7 | 100.0 | 82.4 | 100.0 | |
6 kV | E1 (tailings) | 13.2 | 16.2 | 81.4 | 3.8 | 10.4 | 70.8 | 11.4 |
E2 (concentrate) | 86.8 | 0.6 | 18.6 | 5.0 | 89.6 | 83.7 | 88.6 | |
Feed | 100.0 | 2.6 | 100.0 | 4.8 | 100.0 | 82.0 | 100.0 |