XXXI International Mineral Processing Congress 2024 Proceedings/Washington, DC/Sep 29–Oct 3 1563
(38.99% and 38.78%). While the SiO2 grade demon-
strates similar average values in the IC of ABO and HZT,
the mean content in the IF of HZT exceeds that of ABO
(Table 1 and 2).
The mineralogical characterization of the desliming
underflow focused on analyzing mineral liberation and
determining modal composition, as these factors signifi-
cantly influence concentrate quality, particularly Fe and
SiO2 contents. For both compact and friable itabirites,
the mineralogical composition consists of hematite, aver-
aging 45%, and quartz, averaging 41%. The main miner-
alogical difference between compact and friable itabirites
lies in the proportion of goethite and the association of
quartz. Compact itabirites exhibit an average goethite
content of 4%, while friable itabirites have an average of
6%. Additionally, approximately 3% of the total quartz in
compact itabirite samples in associated with other minerals,
compared to only 1% in friable itabirite samples.
Mineral liberation spectra, correlating cumulative
quartz distribution with particle compositions (liberation
classes), revealed distinct behaviors in the desliming under-
flow based on ore types (compact and friable itabirites) and
sample origins from different deposits (ABO or HZT), as
illustrated in Figure 4. The liberation of quartz, the primary
contaminant, was found to be higher in ABO samples com-
pared to HZT samples.
In general, there exists a correlation between the SiO2
content in the flotation concentrate and the percentage
of mixed quartz-containing polymineral particles in most
samples. A higher percentage of mixed quartz in the flota-
tion feed corresponds to a higher SiO2 content in the con-
centrate, even after an increase in collector dosage.
Regarding the attainment of a P95 of 0.15 mm in
the grinding product, the Horizontes samples exhibited
lower values of the parameter “k,” with a median of 0.39
t/kWh compared to 0.45 t/kWh for the ABO samples.
Consequently, there is a higher energy requirement for the
Figure 4. Mineral liberation spectra for desliming underflow samples of IC and IF from ABO and HZT deposits. The graphs
illustrate varied behaviors based on ore types and mineral deposits
(38.99% and 38.78%). While the SiO2 grade demon-
strates similar average values in the IC of ABO and HZT,
the mean content in the IF of HZT exceeds that of ABO
(Table 1 and 2).
The mineralogical characterization of the desliming
underflow focused on analyzing mineral liberation and
determining modal composition, as these factors signifi-
cantly influence concentrate quality, particularly Fe and
SiO2 contents. For both compact and friable itabirites,
the mineralogical composition consists of hematite, aver-
aging 45%, and quartz, averaging 41%. The main miner-
alogical difference between compact and friable itabirites
lies in the proportion of goethite and the association of
quartz. Compact itabirites exhibit an average goethite
content of 4%, while friable itabirites have an average of
6%. Additionally, approximately 3% of the total quartz in
compact itabirite samples in associated with other minerals,
compared to only 1% in friable itabirite samples.
Mineral liberation spectra, correlating cumulative
quartz distribution with particle compositions (liberation
classes), revealed distinct behaviors in the desliming under-
flow based on ore types (compact and friable itabirites) and
sample origins from different deposits (ABO or HZT), as
illustrated in Figure 4. The liberation of quartz, the primary
contaminant, was found to be higher in ABO samples com-
pared to HZT samples.
In general, there exists a correlation between the SiO2
content in the flotation concentrate and the percentage
of mixed quartz-containing polymineral particles in most
samples. A higher percentage of mixed quartz in the flota-
tion feed corresponds to a higher SiO2 content in the con-
centrate, even after an increase in collector dosage.
Regarding the attainment of a P95 of 0.15 mm in
the grinding product, the Horizontes samples exhibited
lower values of the parameter “k,” with a median of 0.39
t/kWh compared to 0.45 t/kWh for the ABO samples.
Consequently, there is a higher energy requirement for the
Figure 4. Mineral liberation spectra for desliming underflow samples of IC and IF from ABO and HZT deposits. The graphs
illustrate varied behaviors based on ore types and mineral deposits