524 XXXI International Mineral Processing Congress 2024 Proceedings/Washington, DC/Sep 29–Oct 3
a roll speed of 250 rpm with a splitter position of 0 for the
–6 mm particle size feed. Further enrichment in RERMS
was found difficult due to the generation of a higher mag-
netic field gradient over the roll surface, which can attract
both iron-bearing particles as well as locked calcium sili-
cates. Similarly change in the P2O5 content of the products
is found to be insignificant.
Results of Dry LIMS
Further, a few experiments were carried out on the same
equipment by varying the drum speed and splitter position.
The results are given in Figures 9 and 10. From the results of
dry LIMS, it can be found that a magnetic-rich product of
28.3% Fe(T) recovered with two-stage separation. However,
there is an insignificant change in the phosphorous content
of the product.
Further few tests were carried out by considering multi-
stage separation in the same LIMS with variation in process
parameters such as drum speed and splitter position. It is
found that, there is substantial separation in the slag in two
stages while reducing the particle size. The non-magnetic
fraction is enriched with 47.9% CaO with P2O5 of 3.55%,
whereas the magnetic fraction is enriched to 29.6% Fe with
a yield of 14.4%. The detailed separation results can be
observed with mass balance data in Figure 11.
CONCLUSION
Characterisation and dry separation studies of the BOF slag
generated during primary steel manufacturing were carried
out. The following conclusions are summarised:
• Chemical analysis of the sample indicates that the
sample contains 44.4% CaO. It is also found that
an iron value of 17.48% Fe(T) is present along with
12.18% SiO2.
• Particle size analysis found that 80% of the particles
are below 3.4 mm for LD slag. Also, 50% of the par-
ticles are below a particle size of 0.67 mm, and 57%
of the particles are below a particle size of 1 mm.
Figure 8. Results of rare earth roll magnetic separator for the as-received slag (left-magnetic fraction right-non-magnetic
fraction)
Figure 9. Results of dry LIMS for the as-received BOF slag (left-magnetic fraction right-non-magnetic fraction)
a roll speed of 250 rpm with a splitter position of 0 for the
–6 mm particle size feed. Further enrichment in RERMS
was found difficult due to the generation of a higher mag-
netic field gradient over the roll surface, which can attract
both iron-bearing particles as well as locked calcium sili-
cates. Similarly change in the P2O5 content of the products
is found to be insignificant.
Results of Dry LIMS
Further, a few experiments were carried out on the same
equipment by varying the drum speed and splitter position.
The results are given in Figures 9 and 10. From the results of
dry LIMS, it can be found that a magnetic-rich product of
28.3% Fe(T) recovered with two-stage separation. However,
there is an insignificant change in the phosphorous content
of the product.
Further few tests were carried out by considering multi-
stage separation in the same LIMS with variation in process
parameters such as drum speed and splitter position. It is
found that, there is substantial separation in the slag in two
stages while reducing the particle size. The non-magnetic
fraction is enriched with 47.9% CaO with P2O5 of 3.55%,
whereas the magnetic fraction is enriched to 29.6% Fe with
a yield of 14.4%. The detailed separation results can be
observed with mass balance data in Figure 11.
CONCLUSION
Characterisation and dry separation studies of the BOF slag
generated during primary steel manufacturing were carried
out. The following conclusions are summarised:
• Chemical analysis of the sample indicates that the
sample contains 44.4% CaO. It is also found that
an iron value of 17.48% Fe(T) is present along with
12.18% SiO2.
• Particle size analysis found that 80% of the particles
are below 3.4 mm for LD slag. Also, 50% of the par-
ticles are below a particle size of 0.67 mm, and 57%
of the particles are below a particle size of 1 mm.
Figure 8. Results of rare earth roll magnetic separator for the as-received slag (left-magnetic fraction right-non-magnetic
fraction)
Figure 9. Results of dry LIMS for the as-received BOF slag (left-magnetic fraction right-non-magnetic fraction)