XXXI International Mineral Processing Congress 2024 Proceedings/Washington, DC/Sep 29–Oct 3 575
It can be observed that typically, the ROM sample are hard
and lumpy in nature and displays the characteristic dissem-
ination of fines grained white siliceous minerals phases in
the darker chromite ore.
Size analysis was performed to determine the particle
size distribution of the ore, providing information about
the size range and distribution of the chromite particles
(refer Figure 4) .The 80% passing size for the crushed sam-
ples of 100mm, 20mm and 1mm are 75mm, 15mm and
1.9mm respectively.
Chemical analysis, including techniques such as ICP-
AES, was carried out to determine the elemental composi-
tion of the ore, providing insights into the concentration of
different elements present in the sample. It can be observed
that both MgO and SiO2 collectively accounts for ~46.91
and Cr2O3 is 28.71%.Other constituents like Fe, Al2O3,
CaO, Mn, TiO2, Ni, P, S and V2O5 collectively were of
12.9%
Size wise -chemical analysis involved correlating the
particle size distribution data with the chemical composi-
tion of the ore, enabling a deeper understanding of how
the size of the particles relates to their chemical properties.
The trend between the SiO2 and Cr2O3 is observed to be
prominent with decrease in the size as observed in all the
particle size distribution study (refere Figure 5).
X-ray diffraction (XRD) analysis was employed to
identify the mineral phases present in the ore, allowing for
Table 3. The design of experiments used to generate date on
the separation performance
Experiment
Number
Actual levels
Roll Speed
(rpm)
Feed
Rate(tph)
Splitter
Position
1 150 0.1 0
2 200 0.1 0
3 150 0.4 0
4 200 0.4 0
5 150 0.25 –1
6 200 0.25 –1
7 150 0.25 1
8 200 0.25 1
9 180 0.1 –1
10 180 0.4 –1
11 180 0.1 1
12 180 0.4 1
13 180 0.25 0
14 180 0.25 0
15 180 0.25 0
Figure 3. Megascopic view of the low-grade chromite ore
0.0
10.0
20.0
30.0
40.0
50.0
60.0
70.0
80.0
90.0
100.0
0.01 0.1 1 10 100
Average size (mm)
Sample size analysis
ROM sample -20mm sample -1mm size
Figure 4. Particle size distribution of the sample when
analysed as is and then crushed and screened at 20mm and
3mm
Cumulative
weight
%
passing
It can be observed that typically, the ROM sample are hard
and lumpy in nature and displays the characteristic dissem-
ination of fines grained white siliceous minerals phases in
the darker chromite ore.
Size analysis was performed to determine the particle
size distribution of the ore, providing information about
the size range and distribution of the chromite particles
(refer Figure 4) .The 80% passing size for the crushed sam-
ples of 100mm, 20mm and 1mm are 75mm, 15mm and
1.9mm respectively.
Chemical analysis, including techniques such as ICP-
AES, was carried out to determine the elemental composi-
tion of the ore, providing insights into the concentration of
different elements present in the sample. It can be observed
that both MgO and SiO2 collectively accounts for ~46.91
and Cr2O3 is 28.71%.Other constituents like Fe, Al2O3,
CaO, Mn, TiO2, Ni, P, S and V2O5 collectively were of
12.9%
Size wise -chemical analysis involved correlating the
particle size distribution data with the chemical composi-
tion of the ore, enabling a deeper understanding of how
the size of the particles relates to their chemical properties.
The trend between the SiO2 and Cr2O3 is observed to be
prominent with decrease in the size as observed in all the
particle size distribution study (refere Figure 5).
X-ray diffraction (XRD) analysis was employed to
identify the mineral phases present in the ore, allowing for
Table 3. The design of experiments used to generate date on
the separation performance
Experiment
Number
Actual levels
Roll Speed
(rpm)
Feed
Rate(tph)
Splitter
Position
1 150 0.1 0
2 200 0.1 0
3 150 0.4 0
4 200 0.4 0
5 150 0.25 –1
6 200 0.25 –1
7 150 0.25 1
8 200 0.25 1
9 180 0.1 –1
10 180 0.4 –1
11 180 0.1 1
12 180 0.4 1
13 180 0.25 0
14 180 0.25 0
15 180 0.25 0
Figure 3. Megascopic view of the low-grade chromite ore
0.0
10.0
20.0
30.0
40.0
50.0
60.0
70.0
80.0
90.0
100.0
0.01 0.1 1 10 100
Average size (mm)
Sample size analysis
ROM sample -20mm sample -1mm size
Figure 4. Particle size distribution of the sample when
analysed as is and then crushed and screened at 20mm and
3mm
Cumulative
weight
%
passing