3
Additives for Magnetic Separation
The process standard (no reagent) is a mass yield of 51%
with a silica content of 9.5%. As seen in Figure 4, both dis-
persing agents were able to increase mass yield by up to 5%.
CADM 23-226 resulted in a mass recovery of 56% and
10.4% of silica content in the concentrate, whereas CADM
23-236 resulted in a 55% mass recovery and silica content
of 10.2%. Particle dispersion proved to be effective for this
ore, at the dosage of 100 g/t.
In terms of agglomerating agents (Figure 5),
FLOTICOR MS 19510, dosed at 100 g/t, was able to
increase mass yield by 7% with a silica content of 10.5%.
FLOTICOR MS 19124 also showed good performance
with 57% mass recovery and 11% silica content.
The rheology modifiers presented the best result in
terms of mass yield, showed in Figure 6. CADM 23-238
was able to increase mass recovery by 12%, resulting in a
silica content of 11.4%, with a low dosage (50 g/t). The
high silicate content is not a pressing point for this study.
As mentioned before, there would be a flotation stage fol-
lowing magnetic separation, so concentrate quality was not
the objective. However, it was observed that quality was
not extremely affected by the additives as silica content
remained relatively stable.
CONCLUSION
The additives were effective in enhancing slimes (with very
fine material and critical mineralogy) magnetic separation
in dosages of 50 g/t and 100 g/t. These initial results show
that iron ore tailings can be reprocessed through high-gra-
dient magnetic separation using the mechanisms of disper-
sion, selective agglomeration, and rheology modification,
thus enabling the reduction of the volume of ultrafine
tailings to be filtered and/or disposed of. CADM 23-238
increased the mass yield of the slimes from 51% to 63%,
keeping the silica content low (11.4%), which means a 12%
mass recovery increase, dosing only 50 g/t of the reagent.
Further studies with magnetic separation additives should
Figure 3. Particle Size Distribution of the slimes sample
Figure 4. Tests results using dispersing agents as additives
Figure 5. Tests results using agglomerating agents as
additives
Figure 6. Tests results using rheology modifiers as additives
Additives for Magnetic Separation
The process standard (no reagent) is a mass yield of 51%
with a silica content of 9.5%. As seen in Figure 4, both dis-
persing agents were able to increase mass yield by up to 5%.
CADM 23-226 resulted in a mass recovery of 56% and
10.4% of silica content in the concentrate, whereas CADM
23-236 resulted in a 55% mass recovery and silica content
of 10.2%. Particle dispersion proved to be effective for this
ore, at the dosage of 100 g/t.
In terms of agglomerating agents (Figure 5),
FLOTICOR MS 19510, dosed at 100 g/t, was able to
increase mass yield by 7% with a silica content of 10.5%.
FLOTICOR MS 19124 also showed good performance
with 57% mass recovery and 11% silica content.
The rheology modifiers presented the best result in
terms of mass yield, showed in Figure 6. CADM 23-238
was able to increase mass recovery by 12%, resulting in a
silica content of 11.4%, with a low dosage (50 g/t). The
high silicate content is not a pressing point for this study.
As mentioned before, there would be a flotation stage fol-
lowing magnetic separation, so concentrate quality was not
the objective. However, it was observed that quality was
not extremely affected by the additives as silica content
remained relatively stable.
CONCLUSION
The additives were effective in enhancing slimes (with very
fine material and critical mineralogy) magnetic separation
in dosages of 50 g/t and 100 g/t. These initial results show
that iron ore tailings can be reprocessed through high-gra-
dient magnetic separation using the mechanisms of disper-
sion, selective agglomeration, and rheology modification,
thus enabling the reduction of the volume of ultrafine
tailings to be filtered and/or disposed of. CADM 23-238
increased the mass yield of the slimes from 51% to 63%,
keeping the silica content low (11.4%), which means a 12%
mass recovery increase, dosing only 50 g/t of the reagent.
Further studies with magnetic separation additives should
Figure 3. Particle Size Distribution of the slimes sample
Figure 4. Tests results using dispersing agents as additives
Figure 5. Tests results using agglomerating agents as
additives
Figure 6. Tests results using rheology modifiers as additives