1954 XXXI International Mineral Processing Congress 2024 Proceedings/Washington, DC/Sep 29–Oct 3
carbon. This suggests that individual entities are more sepa-
rated in –25 micron. However, in the case of –75 micron,
mixed elemental distribution can be observed. Areas 1, 2,
and 3 all represent a combination of carbon, silica, and
iron oxide, which indicates that enough liberation has not
occurred.
Stereo Microscope
Stereo microscopic images are shown in Figure 21(a–e)
with unit scale of 500µm to 1 mm. stereo microscope pro-
vides three-dimensional (3D) imaging of a specimen at low
to moderate magnifications. It is observed that shiny glassy
phases are attached with dark carbon particles. Black par-
ticles indicate magnetite while reddish brown are hematite
grains. Other silicate minerals carry mixed color texture.
Siliceous materials are also attached with iron grains. Lesser
extent of interlocking appears in the finer fractions which
enables the material for effective separation.
CONCLUSION
An effort was made to separate iron and carbonaceous
material from blast furnace flue dust. The floatation kinetic
study was carried out using different reagents for three dif-
ferent feed sizes. The magnetic separation study consists of
LIMS targeting mainly magnetite material and WHIMS
was incorporated to separate other ferruginous material
from gangues and remaining carbonaceous material. The
feed size was optimized based on particle liberation and
process parameters were optimized based on yield, iron
grade, iron recovery and fixed carbon and carbon recovery.
Some of the key findings are described below.
1. The Blast Furnace Flue Dust (BFD) sample
has been thoroughly characterized, revealing its
Figure 19. SEM-EDS analysis on –75 micron feed sample
Figure 20. SEM-EDS analysis on –25 micron feed sample
carbon. This suggests that individual entities are more sepa-
rated in –25 micron. However, in the case of –75 micron,
mixed elemental distribution can be observed. Areas 1, 2,
and 3 all represent a combination of carbon, silica, and
iron oxide, which indicates that enough liberation has not
occurred.
Stereo Microscope
Stereo microscopic images are shown in Figure 21(a–e)
with unit scale of 500µm to 1 mm. stereo microscope pro-
vides three-dimensional (3D) imaging of a specimen at low
to moderate magnifications. It is observed that shiny glassy
phases are attached with dark carbon particles. Black par-
ticles indicate magnetite while reddish brown are hematite
grains. Other silicate minerals carry mixed color texture.
Siliceous materials are also attached with iron grains. Lesser
extent of interlocking appears in the finer fractions which
enables the material for effective separation.
CONCLUSION
An effort was made to separate iron and carbonaceous
material from blast furnace flue dust. The floatation kinetic
study was carried out using different reagents for three dif-
ferent feed sizes. The magnetic separation study consists of
LIMS targeting mainly magnetite material and WHIMS
was incorporated to separate other ferruginous material
from gangues and remaining carbonaceous material. The
feed size was optimized based on particle liberation and
process parameters were optimized based on yield, iron
grade, iron recovery and fixed carbon and carbon recovery.
Some of the key findings are described below.
1. The Blast Furnace Flue Dust (BFD) sample
has been thoroughly characterized, revealing its
Figure 19. SEM-EDS analysis on –75 micron feed sample
Figure 20. SEM-EDS analysis on –25 micron feed sample