2662 XXXI International Mineral Processing Congress 2024 Proceedings/Washington, DC/Sep 29–Oct 3
solutions except for pine oil which was added as a single
drop only when necessary. The conditioning and flotation
times at each stage are shown in Table 3. The air flow rate
was set at 2.5L/min in all flotation stages. The combined
rougher concentrate was cleaned in a cleaner flotation stage
using a 1.3L flotation cell.
Lepidolite Flotation
The lepidolite ore sample of 500g (Sample C) was milled
for 20 mins in a rod mill charged with 6.3 kg of rods and
500mL of water to produce a slurry with a P80 of 50µm.
The milled ore was transferred into a 2.0L flotation cell
where water was added to the mark. The pH of the pulp was
adjusted to 3.5 using H2SO4 while agitating at 1000rpm.
Collectors (Armoflote ® 940 product and a combination of
Armeen ® T and Armeen ® C products ratio 2:1) were added
as 1% aqueous solution. Conditioning was carried out for
6 min. The flotation tests were done using a Denver D12
flotation machine with the air flow rate set at 2.5L/min.
Rougher flotation tests were carried out for 7 mins
while the two cleaning steps were performed for 6 and
5 mins respectively at an air rate of 1.5L/min and agitator
speed of 1,000 rpm.
RESULTS
Spodumene Flotation
Baseline Flotation (Rougher Flotation)
Figure 2 compares the rougher flotation performance of
TOFA, Atrac ® 2600 product plus TOFA, and Berol ®
8305 product. The ore shown in Table 1 was used in these
experiments. In general, the TOFA showed fast kinetics
when compared to the Berol ® 8305 product (Figure 2a),
however, Berol ® 8305 product was highly selective and
Table 3. Stage addition of reagents in fatty amine flotation of mica
Stage
Reagents Time (mins
Dextrin (yellow) Fatty Amine Pine Oil pH Conditioning Time (mins) Flotation Time (mins)
Rougher 1 1,000 75 1drp 8 1 4 4
Rougher 2 75 50 8 5 4
Cleaner -8 4
Total 1,000 150 125 1drp
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10
Time (min)
TOFA
Berol® 8305
Atrac® 2600 /TOFA (50:50)
30
40
50
60
70
80
90
100
37000 42000 47000 52000 57000 62000
(Li
2 O) Grade (ppm)
TOFA
Berol® 8305
Atrac® 2600 /TOFA (50:50)
(a) (b)
Figure 2. Flotation performance of the anionic collectors on spodumene flotation (a) recovery time graph (b) grade recovery
curve
Recovery
(%Li2O)
Recovery
(%LiO
2
solutions except for pine oil which was added as a single
drop only when necessary. The conditioning and flotation
times at each stage are shown in Table 3. The air flow rate
was set at 2.5L/min in all flotation stages. The combined
rougher concentrate was cleaned in a cleaner flotation stage
using a 1.3L flotation cell.
Lepidolite Flotation
The lepidolite ore sample of 500g (Sample C) was milled
for 20 mins in a rod mill charged with 6.3 kg of rods and
500mL of water to produce a slurry with a P80 of 50µm.
The milled ore was transferred into a 2.0L flotation cell
where water was added to the mark. The pH of the pulp was
adjusted to 3.5 using H2SO4 while agitating at 1000rpm.
Collectors (Armoflote ® 940 product and a combination of
Armeen ® T and Armeen ® C products ratio 2:1) were added
as 1% aqueous solution. Conditioning was carried out for
6 min. The flotation tests were done using a Denver D12
flotation machine with the air flow rate set at 2.5L/min.
Rougher flotation tests were carried out for 7 mins
while the two cleaning steps were performed for 6 and
5 mins respectively at an air rate of 1.5L/min and agitator
speed of 1,000 rpm.
RESULTS
Spodumene Flotation
Baseline Flotation (Rougher Flotation)
Figure 2 compares the rougher flotation performance of
TOFA, Atrac ® 2600 product plus TOFA, and Berol ®
8305 product. The ore shown in Table 1 was used in these
experiments. In general, the TOFA showed fast kinetics
when compared to the Berol ® 8305 product (Figure 2a),
however, Berol ® 8305 product was highly selective and
Table 3. Stage addition of reagents in fatty amine flotation of mica
Stage
Reagents Time (mins
Dextrin (yellow) Fatty Amine Pine Oil pH Conditioning Time (mins) Flotation Time (mins)
Rougher 1 1,000 75 1drp 8 1 4 4
Rougher 2 75 50 8 5 4
Cleaner -8 4
Total 1,000 150 125 1drp
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10
Time (min)
TOFA
Berol® 8305
Atrac® 2600 /TOFA (50:50)
30
40
50
60
70
80
90
100
37000 42000 47000 52000 57000 62000
(Li
2 O) Grade (ppm)
TOFA
Berol® 8305
Atrac® 2600 /TOFA (50:50)
(a) (b)
Figure 2. Flotation performance of the anionic collectors on spodumene flotation (a) recovery time graph (b) grade recovery
curve
Recovery
(%Li2O)
Recovery
(%LiO
2