5
make estimates to make decisions on the appropriate tech-
nology section for each process stage (Table 6).
EXPECTED BENEFITS OF THE
INDUSTRIAL SCALE FLOWSHEET
HPGR Wet Screening at 3 mm
Screens at 3 mm with the help of water will develop high
classification efficiency of screens. In addition, the use of
HPGR technology to achieve fine particle size distribution,
together with the use of wet screening, will increase the lib-
eration of gangue and will improve the separation efficiency
of the cobbing LIMS and decrease the downstream grind-
ing energy requirements.
Cobbing Stage
The application of LIMS technology prior to the primary
grinding circuit will reject non-magnetic gangue with high
hardness (35% less mass), avoid the intensive use of energy
and consumables (balls, liners, etc.) in the grinding. The
BWI (kwh/tm) of the cobbing concentrate will be lower
than the hardness index of the crude ore. This will have a
positive impact downstream on the next primary milling
circuit.
High-Frequency Screening in Primary and Secondary
Grinding Circuits
The use of closed cycle high-frequency screening tech-
nology2 of the grinding circuits (primary and secondary)
will demonstrate high classification efficiency and low
Table 6. Recommended equipment for each processing stage
Processing Stage Recommended Equipment
1st crushing
2st classification
2st crushing
3st crushing
3st classification
Cobbing LIMS
Primary grinding
1st classification
Intermediate LIMS
2st grinding
2st classification
Desliming Cleaner LIMS
Reverse sulphur flotation
Reverse silica flotation
Dewatering
Regrinding
Scavenger LIMS
Gyratory crusher
Banana Screens DD -45 mm
Cone Crushers
HPGRs
Banana Screens DD -3 mm
LIMS 1100 G
Overflow Ball Mills
High Frecuency Screens -300 µm
LIMS 1100 G
VTMs
High Frecuency Screens -53 µm
Hydroseparators/LFCU
LIMS 800 G
Pneumatic cells Pneumatic cells
LFCU
Stirred Mill
LIMS 800 G
1st Crushing
2st Screening 2st Crushing
3st Crushing
3st Screening (wet)
1st Grinding
1st
Classification
Interm. LIMS
Cobbing LIMS
2st Grinding
2st Classification
Stockpiling
Desliming
Cleaner LIMS
Rev. Sulphur Flot.
Rev. Silica Flot.
Dewatering &
Regrind
Scv. LIMS
Final Iron
Concentrate
Figure 6. The process flowsheet
make estimates to make decisions on the appropriate tech-
nology section for each process stage (Table 6).
EXPECTED BENEFITS OF THE
INDUSTRIAL SCALE FLOWSHEET
HPGR Wet Screening at 3 mm
Screens at 3 mm with the help of water will develop high
classification efficiency of screens. In addition, the use of
HPGR technology to achieve fine particle size distribution,
together with the use of wet screening, will increase the lib-
eration of gangue and will improve the separation efficiency
of the cobbing LIMS and decrease the downstream grind-
ing energy requirements.
Cobbing Stage
The application of LIMS technology prior to the primary
grinding circuit will reject non-magnetic gangue with high
hardness (35% less mass), avoid the intensive use of energy
and consumables (balls, liners, etc.) in the grinding. The
BWI (kwh/tm) of the cobbing concentrate will be lower
than the hardness index of the crude ore. This will have a
positive impact downstream on the next primary milling
circuit.
High-Frequency Screening in Primary and Secondary
Grinding Circuits
The use of closed cycle high-frequency screening tech-
nology2 of the grinding circuits (primary and secondary)
will demonstrate high classification efficiency and low
Table 6. Recommended equipment for each processing stage
Processing Stage Recommended Equipment
1st crushing
2st classification
2st crushing
3st crushing
3st classification
Cobbing LIMS
Primary grinding
1st classification
Intermediate LIMS
2st grinding
2st classification
Desliming Cleaner LIMS
Reverse sulphur flotation
Reverse silica flotation
Dewatering
Regrinding
Scavenger LIMS
Gyratory crusher
Banana Screens DD -45 mm
Cone Crushers
HPGRs
Banana Screens DD -3 mm
LIMS 1100 G
Overflow Ball Mills
High Frecuency Screens -300 µm
LIMS 1100 G
VTMs
High Frecuency Screens -53 µm
Hydroseparators/LFCU
LIMS 800 G
Pneumatic cells Pneumatic cells
LFCU
Stirred Mill
LIMS 800 G
1st Crushing
2st Screening 2st Crushing
3st Crushing
3st Screening (wet)
1st Grinding
1st
Classification
Interm. LIMS
Cobbing LIMS
2st Grinding
2st Classification
Stockpiling
Desliming
Cleaner LIMS
Rev. Sulphur Flot.
Rev. Silica Flot.
Dewatering &
Regrind
Scv. LIMS
Final Iron
Concentrate
Figure 6. The process flowsheet