XXXI International Mineral Processing Congress 2024 Proceedings/Washington, DC/Sep 29–Oct 3 2679
size fractions. Thus, the simulation result indicates a rela-
tively small particle size promotes the recovery of carbon at
a relatively short flotation time.
Figure 5, on the other hand, shows the experimental
results in terms of the grade of carbon in the concentrate as
a function of flotation time, which are compared with the
calculation results obtained using the new kinetic model
(Eq. 4). It was predicted that the carbon grade in the con-
centrate decreased as the flotation time elongated, espe-
cially for the size fraction with the largest particle size (i.e.,
SR-Sieve). On the other hand, the grade of carbon in the
other two size fractions, with smaller particle sizes, was not
affected by the flotation time. These results indicated that
flotation tends to recover carbon faster from coarse-grained
fractions, such as the SR-Sieve size fraction. It was also
found that the optimal flotation time for carbon recovery is
within 5 minutes. Finally, Figure 5 shows that the results of
the flotation test, in terms of the grade of the product, were
well predicted using the new model (Eq. 4)
CONCLUSIONS
This research primarily contributes to reducing the land-
fill capacity of ASR-char produced in carbonization plants.
The results of the froth flotation experiments indicated
that as much as 79.3% of the carbon-rich product with a
Table 2. Composition of ASR-char (-1 mm)
Component (s) Mass %,Dry Basis
Fixed carbon 26.2
Volatile matter 18.2
(H2O, CO2, CO, etc.)
SiO2 6.5
Cl 4.5
CaCO3 19.4
TiO
2 2.5
Fe
3 O
4 10.4
ZnO 5.8
Others (1.1) 6.5
Total 100.0
Figure 4. A comparison of the experimental and simulation results in terms of the
recovery of carbon in froth fraction as a function of flotation time
Table 3. Composition of three different size factions of ASR-
char
Components,
(%)
Size Fractions
SR-Sieve SR-Cyclone SR-Wind
C 18.07 28.57 37.33
SiO2 12.64 11.92 11.37
CaO 18.78 16.18 13.74
Fe
2 O
3 20.36 14.45 7.77
size fractions. Thus, the simulation result indicates a rela-
tively small particle size promotes the recovery of carbon at
a relatively short flotation time.
Figure 5, on the other hand, shows the experimental
results in terms of the grade of carbon in the concentrate as
a function of flotation time, which are compared with the
calculation results obtained using the new kinetic model
(Eq. 4). It was predicted that the carbon grade in the con-
centrate decreased as the flotation time elongated, espe-
cially for the size fraction with the largest particle size (i.e.,
SR-Sieve). On the other hand, the grade of carbon in the
other two size fractions, with smaller particle sizes, was not
affected by the flotation time. These results indicated that
flotation tends to recover carbon faster from coarse-grained
fractions, such as the SR-Sieve size fraction. It was also
found that the optimal flotation time for carbon recovery is
within 5 minutes. Finally, Figure 5 shows that the results of
the flotation test, in terms of the grade of the product, were
well predicted using the new model (Eq. 4)
CONCLUSIONS
This research primarily contributes to reducing the land-
fill capacity of ASR-char produced in carbonization plants.
The results of the froth flotation experiments indicated
that as much as 79.3% of the carbon-rich product with a
Table 2. Composition of ASR-char (-1 mm)
Component (s) Mass %,Dry Basis
Fixed carbon 26.2
Volatile matter 18.2
(H2O, CO2, CO, etc.)
SiO2 6.5
Cl 4.5
CaCO3 19.4
TiO
2 2.5
Fe
3 O
4 10.4
ZnO 5.8
Others (1.1) 6.5
Total 100.0
Figure 4. A comparison of the experimental and simulation results in terms of the
recovery of carbon in froth fraction as a function of flotation time
Table 3. Composition of three different size factions of ASR-
char
Components,
(%)
Size Fractions
SR-Sieve SR-Cyclone SR-Wind
C 18.07 28.57 37.33
SiO2 12.64 11.92 11.37
CaO 18.78 16.18 13.74
Fe
2 O
3 20.36 14.45 7.77