XXXI International Mineral Processing Congress 2024 Proceedings/Washington, DC/Sep 29–Oct 3 2049
highest, which are 28.13 and 14.22% respectively, indicat-
ing that the raw coal has relatively more high ash and fine
mud content, which will affect the subsequent sorting of
macerals. From Table 3, the raw coal has more content of
low density grade material, and there are five density grades
with ash less than 5%, which are –1.30, 1.30–1.33, 1.33–
1.35, 1.35–1.40, and 1.4–1.45 g/cm3, and the sum of the
yields is 79.87%, of which +1.55 g/cm3 density grade con-
tent accounted for a larger proportion and higher ash con-
tent of 57.67%.
Analyses of Macerals Composition
BA310Pol type polarising microscope was used to deter-
mine the microscopic composition of low-rank bituminous
coal macerals. From Table 4, it can be seen that the macer-
als are dominated by the vitrinite and inertinite, with the
vitrinite content of being 41.88% and inertinite content
of being 50.63%, and the exinite has a low mass fraction
content of only 1.25%. Mineral mass fraction content is
6.25%, of which clay group accounts for 5% and sulphide
accounts for 1.25%.
The microscopic morphology of macerals is shown in
Figure 1. The vitrinite of Shenhua low-rank bituminous
coal is dominated by matrix specular bodies (cemented
hemifilaments, fragments of filaments, detrital inertia,
coarse-grained bodies, microsporangia, clay, pyrite, etc.)
(dark grey strips in Figure 1a), with occasional structural
specular bodies (the cellular cavities are elongated by extru-
sion and are mostly hollow, and a few of them are filled up
by clay) (Figure 1b).The inertinite is dominated by hemi-
filament bodies (Figure 1c), with a small amount of detrital
inertia and oxidised filament bodies (Figure 1d), followed
by coarse-grained bodies (Figure 1e) and occasional
Table 4. The petrographic analysis of low-rank coal sample
Macerals Constituents Percent, %Total, %
Vitrinite Telinite 0.63 41.88
Collinite 41.25
Inertinite Fusinite 3.13 50.63
Semifusinite 40.63
Macrinite 1.88
Micrinite 0.63
Inertodetrinite 4.38
Exinite Sporinite 1.25 1.25
Minerals Calcite, quartz, clay
minerals
6.25 6.25
Figure 1. The morphology of low-rank coal sample
highest, which are 28.13 and 14.22% respectively, indicat-
ing that the raw coal has relatively more high ash and fine
mud content, which will affect the subsequent sorting of
macerals. From Table 3, the raw coal has more content of
low density grade material, and there are five density grades
with ash less than 5%, which are –1.30, 1.30–1.33, 1.33–
1.35, 1.35–1.40, and 1.4–1.45 g/cm3, and the sum of the
yields is 79.87%, of which +1.55 g/cm3 density grade con-
tent accounted for a larger proportion and higher ash con-
tent of 57.67%.
Analyses of Macerals Composition
BA310Pol type polarising microscope was used to deter-
mine the microscopic composition of low-rank bituminous
coal macerals. From Table 4, it can be seen that the macer-
als are dominated by the vitrinite and inertinite, with the
vitrinite content of being 41.88% and inertinite content
of being 50.63%, and the exinite has a low mass fraction
content of only 1.25%. Mineral mass fraction content is
6.25%, of which clay group accounts for 5% and sulphide
accounts for 1.25%.
The microscopic morphology of macerals is shown in
Figure 1. The vitrinite of Shenhua low-rank bituminous
coal is dominated by matrix specular bodies (cemented
hemifilaments, fragments of filaments, detrital inertia,
coarse-grained bodies, microsporangia, clay, pyrite, etc.)
(dark grey strips in Figure 1a), with occasional structural
specular bodies (the cellular cavities are elongated by extru-
sion and are mostly hollow, and a few of them are filled up
by clay) (Figure 1b).The inertinite is dominated by hemi-
filament bodies (Figure 1c), with a small amount of detrital
inertia and oxidised filament bodies (Figure 1d), followed
by coarse-grained bodies (Figure 1e) and occasional
Table 4. The petrographic analysis of low-rank coal sample
Macerals Constituents Percent, %Total, %
Vitrinite Telinite 0.63 41.88
Collinite 41.25
Inertinite Fusinite 3.13 50.63
Semifusinite 40.63
Macrinite 1.88
Micrinite 0.63
Inertodetrinite 4.38
Exinite Sporinite 1.25 1.25
Minerals Calcite, quartz, clay
minerals
6.25 6.25
Figure 1. The morphology of low-rank coal sample