XXXI International Mineral Processing Congress 2024 Proceedings/Washington, DC/Sep 29–Oct 3 2033
was 19.2% at a P2O5 grade of 28.9% and SiO2 content of
11.4%.
Pilot DMS results
To produce the highest possible grade concentrate in the
floats product, while simultaneously maximizing the mass
yield, the targeted cut point was 2.5g/cm3. The results for
the two-stage DMS operation are presented in Table 3.
From this process, the cleanest phosphate product had
a low mass yield of 16.1% at a P2O5 grade of 30.1%.
A comparison of HLS washability data, DMS model-
ling and actual DMS pilot testing when producing a high
grade concentrate is shown in Figure 6. Comparing the
pilot data to the DMS model and modified HLS data, it
was evident that the DMS test achieved a slightly lower
mass yield, but at a P2O5 grade of 30.1%, which met the
target specification. Quartz content was reduced to 8.0%.
The low recovery of 24.4% was observed although as made
evident from the modelled data in Figure 5, there was little
room to improve this using a single stage DMS process.
CFD Modelling Results
Figure 7 depicts contour maps of the static pressure and
volume fraction at identical instances after the transient
simulation showed minimal fluctuation. For pressure,
it was observed as anticipated that the highest pressure
occurred at the outer vortex where the fluid rotated against
the outer boundary walls, while a transition to a negative
Table 2. Liquid, air and particle properties utilized in the CFD modelling
Eulerian Phases
Material type Density, kg/m3 Viscosity, kg/m.s
DMS fluid 2500 1.9 × 10–3
Air 1.225 1.789 × 10–5
Discrete particle phase
Density, kg/m3 Diameter, mm
Injection 1: Finer lower grade P
2 O
5 2650 0.5–1
Injection 2: Coarser lower grade P2O5 2650 2.5–5
Injection 3: Finer higher grade P2O5 2300 0.5–1
Injection 4: Coarser higher grade P
2 O
5 2300 2.5–5
Injection 5: Finer gangue 2600 0.5–1
Injection 6: Coarser gangue 2600 2.5–5
Figure 4. Discrete mass yield and grade by density
was 19.2% at a P2O5 grade of 28.9% and SiO2 content of
11.4%.
Pilot DMS results
To produce the highest possible grade concentrate in the
floats product, while simultaneously maximizing the mass
yield, the targeted cut point was 2.5g/cm3. The results for
the two-stage DMS operation are presented in Table 3.
From this process, the cleanest phosphate product had
a low mass yield of 16.1% at a P2O5 grade of 30.1%.
A comparison of HLS washability data, DMS model-
ling and actual DMS pilot testing when producing a high
grade concentrate is shown in Figure 6. Comparing the
pilot data to the DMS model and modified HLS data, it
was evident that the DMS test achieved a slightly lower
mass yield, but at a P2O5 grade of 30.1%, which met the
target specification. Quartz content was reduced to 8.0%.
The low recovery of 24.4% was observed although as made
evident from the modelled data in Figure 5, there was little
room to improve this using a single stage DMS process.
CFD Modelling Results
Figure 7 depicts contour maps of the static pressure and
volume fraction at identical instances after the transient
simulation showed minimal fluctuation. For pressure,
it was observed as anticipated that the highest pressure
occurred at the outer vortex where the fluid rotated against
the outer boundary walls, while a transition to a negative
Table 2. Liquid, air and particle properties utilized in the CFD modelling
Eulerian Phases
Material type Density, kg/m3 Viscosity, kg/m.s
DMS fluid 2500 1.9 × 10–3
Air 1.225 1.789 × 10–5
Discrete particle phase
Density, kg/m3 Diameter, mm
Injection 1: Finer lower grade P
2 O
5 2650 0.5–1
Injection 2: Coarser lower grade P2O5 2650 2.5–5
Injection 3: Finer higher grade P2O5 2300 0.5–1
Injection 4: Coarser higher grade P
2 O
5 2300 2.5–5
Injection 5: Finer gangue 2600 0.5–1
Injection 6: Coarser gangue 2600 2.5–5
Figure 4. Discrete mass yield and grade by density