580 XXXI International Mineral Processing Congress 2024 Proceedings/Washington, DC/Sep 29–Oct 3
1. Effective removal of the finer silicate particles
resulting in the improved separation and hence
better grade.
2. Chromite particles are distributed towards the fin-
ers size are effectively segregated in the wet separa-
tion process.
Taking cue from the above results, an attempt was made to
carry out the magnetic separation after classifying the finers
size fraction i.e., less than 250µm particles to understand if
it will aid the separation to yield better results. The results
obtained are depicted in the graph below.
It can be observed from the magnetic separation results
post screening (0.25mm fraction) that the SiO2 reduction
has marginally improved from 17.9 to 16.9% and Cr2O3
has increased from 31.1 to 34.28, however, there is substan-
tial decrease in the yield from 88.5 to 66.83%. It can be
understood from the results that screening may marginally
help in improving the SiO2 reduction and improvement is
Cr2O3%.
CONCLUSION
From the study on low-grade chromite ore which ana-
lyzed for 28.7% Cr2O3 with 20.5% SiO2,was upgraded to
33.6% Cr2O3 and 17.6 SiO2 with a yield of 77.39%. By
screening the 0.25 mm particle from the feed of –1mm
fraction, the silica reduction can be further decreased to
16.9%, but with a yield loss of ~21%. Multi-stage separa-
tion of RERMS can be helpful to maximize the silica rejec-
tion with maximum chromite recovery.
REFERENCE
[1] Abubakre, O., Aremu, M., Nwokike, P., 2007.
Characterization and Beneficiation of Anka
Chromite Ore Using Magnetic Separation Process.
J. Miner. Mater. Charact. Eng. 06. doi: 10.4236
/jmmce.2007.62012.
[2] Al-Tigani, M.M.H., Awdekarim, A., Abdueldaem,
A.A.-G., Abdullah, A., Seifelnasr, S., 2020.
Application of Response Surface Methodology on
Beneficiation of Sudanese Chromite Ore via Pilot
Plant Shaking Table Separator 4.
[3] Ayinla, K.I., Baba, A.A., Tripathy, B.C., Ghosh,
M.K., Dwari, R.K., Padhy, S.K., 2019a. Enrichment
of a Nigerian chromite ore for metallurgical applica-
tion by dense medium flotation and magnetic separa-
tion. Metall. Res. Technol. 116, 324. doi: 10.1051
/metal/2018097.
[4] Can, İ.B., Özsoy, B., Ergün, Ş.L., 2019. Developing
an optimum beneficiation route for a low-grade chro-
mite ore. Physicochem. Probl. Miner. Process. ISSN
2084–4735. doi: 10.5277/PPMP19006.
[5] Chakraborty, K.L., Chakraborty, T.L., 1984.
Geological features and origin of the chromite depos-
its of sukinda valley, Orissa, India. Miner. Deposita
19, 256–265. doi: 10.1007/BF00204378.
[6] Chang, J., Li, H., Zheng, K., Liu, C., Wang, L., Li,
B., Bu, X., Shao, H., 2020. Mineralogical charac-
terisation and separation studies on the recovery of
Cr2O3 in the high carbon ferrochrome slag.
Feed
{100%}
Dry beneficiation
{77.39%}
Wet
beneficiation
{53.78%}
10
12
14
16
18
20
22
25 30 35 40 45
Cr2O3 (%)
Comparision between Dry magnetic separation
&gravity concentration test
Figure 12. Comparison between the dry beneficiation and
wet beneficiation results
0
10
20
30
40
50
60
70
80
90
100
15
20
25
30
35
40
Feed Cr2O3 -1mm fraction -1+0.25mm
Cr2O3 SiO2 Yield
Figure 13. Comparison between the magnetic separation
results of Unscreened Feed (less than 1mm fraction) and
screened feed (-1mm+0.25mm)
SiO2(%)
Yield(%)
Cr2O3(%)
&
SiO2(%)
1. Effective removal of the finer silicate particles
resulting in the improved separation and hence
better grade.
2. Chromite particles are distributed towards the fin-
ers size are effectively segregated in the wet separa-
tion process.
Taking cue from the above results, an attempt was made to
carry out the magnetic separation after classifying the finers
size fraction i.e., less than 250µm particles to understand if
it will aid the separation to yield better results. The results
obtained are depicted in the graph below.
It can be observed from the magnetic separation results
post screening (0.25mm fraction) that the SiO2 reduction
has marginally improved from 17.9 to 16.9% and Cr2O3
has increased from 31.1 to 34.28, however, there is substan-
tial decrease in the yield from 88.5 to 66.83%. It can be
understood from the results that screening may marginally
help in improving the SiO2 reduction and improvement is
Cr2O3%.
CONCLUSION
From the study on low-grade chromite ore which ana-
lyzed for 28.7% Cr2O3 with 20.5% SiO2,was upgraded to
33.6% Cr2O3 and 17.6 SiO2 with a yield of 77.39%. By
screening the 0.25 mm particle from the feed of –1mm
fraction, the silica reduction can be further decreased to
16.9%, but with a yield loss of ~21%. Multi-stage separa-
tion of RERMS can be helpful to maximize the silica rejec-
tion with maximum chromite recovery.
REFERENCE
[1] Abubakre, O., Aremu, M., Nwokike, P., 2007.
Characterization and Beneficiation of Anka
Chromite Ore Using Magnetic Separation Process.
J. Miner. Mater. Charact. Eng. 06. doi: 10.4236
/jmmce.2007.62012.
[2] Al-Tigani, M.M.H., Awdekarim, A., Abdueldaem,
A.A.-G., Abdullah, A., Seifelnasr, S., 2020.
Application of Response Surface Methodology on
Beneficiation of Sudanese Chromite Ore via Pilot
Plant Shaking Table Separator 4.
[3] Ayinla, K.I., Baba, A.A., Tripathy, B.C., Ghosh,
M.K., Dwari, R.K., Padhy, S.K., 2019a. Enrichment
of a Nigerian chromite ore for metallurgical applica-
tion by dense medium flotation and magnetic separa-
tion. Metall. Res. Technol. 116, 324. doi: 10.1051
/metal/2018097.
[4] Can, İ.B., Özsoy, B., Ergün, Ş.L., 2019. Developing
an optimum beneficiation route for a low-grade chro-
mite ore. Physicochem. Probl. Miner. Process. ISSN
2084–4735. doi: 10.5277/PPMP19006.
[5] Chakraborty, K.L., Chakraborty, T.L., 1984.
Geological features and origin of the chromite depos-
its of sukinda valley, Orissa, India. Miner. Deposita
19, 256–265. doi: 10.1007/BF00204378.
[6] Chang, J., Li, H., Zheng, K., Liu, C., Wang, L., Li,
B., Bu, X., Shao, H., 2020. Mineralogical charac-
terisation and separation studies on the recovery of
Cr2O3 in the high carbon ferrochrome slag.
Feed
{100%}
Dry beneficiation
{77.39%}
Wet
beneficiation
{53.78%}
10
12
14
16
18
20
22
25 30 35 40 45
Cr2O3 (%)
Comparision between Dry magnetic separation
&gravity concentration test
Figure 12. Comparison between the dry beneficiation and
wet beneficiation results
0
10
20
30
40
50
60
70
80
90
100
15
20
25
30
35
40
Feed Cr2O3 -1mm fraction -1+0.25mm
Cr2O3 SiO2 Yield
Figure 13. Comparison between the magnetic separation
results of Unscreened Feed (less than 1mm fraction) and
screened feed (-1mm+0.25mm)
SiO2(%)
Yield(%)
Cr2O3(%)
&
SiO2(%)