XXXI International Mineral Processing Congress 2024 Proceedings/Washington, DC/Sep 29–Oct 3 3459
line of those smaller particulates. As this constriction would
limit smaller particles from reaching the centrifuge, these
smaller particles were not provided the opportunity to be
spun in the centrifuge, where, dependent upon particle size,
may have been found in the centrate, leading to a higher %
of remaining solids. With this understanding, while mea-
surable, even when the feed rate was fully flushed, the %of
solids in the centrate remained consistent at 0.5–1% solids
by weight in the centrate. (Figure 15)
Comparison of the Differential RPM Between Bowl
and Scroll vs %Remaining Solids Still in the Centrate
Output of the Centrifuge
The centrifuge is equipped with a two frequency inverter
“Simp Drive,” which allows for stepless adjustment of the
scroll speed, permitting a fully automatic mode. Utilizing
the scroll’s differential RPM as the variable for these tests,
with a differential speed range of between 20RPM and
50RPM, it was found that there was no correlation between
the differential RPM and the solids remaining in the cen-
trate which indicates a propensity to allow for selection of a
Scroll Differential RPM that provides optimal energy utili-
zation. Once more, differential speed can permit additional
settling time in the bowl, for solid/liquid speration, which
Figure 15.
Figure 16.
becomes particularly advantageous in feed containing simi-
lar SG material requring separation (Figure 16).
Comparison of the Differential RPM Between Bowl
and scroll vs %Dryness of the Solids Output of the
Centrifuge
Once more, the differential RPM is utilized as the variable
for these series of tests. In this circumstance, we do not see
correlation between a higher differential RPM, and the %
of dryness of total solids in the cake produced from the cen-
trifuge. While there are certain portions of this test mirror-
ing correlation in the last 60 tests, the consistencies in a lack
of correlation in the first 50 tests confirm additional vari-
ables contributing to dryness of solids in the cake, beyond
differential speed. Removing outliers from variable testing
of other inputs, a consistent dry solids content of +80%
was achieved (Figure 17).
CONCLUSION
This had proved to be unique study, as the original inten-
tion was not to perform testing but rather to mimic a future
fulltime installation.
The pilot installation technical team had optimized
the equipment to the best possible settings to produce the
line of those smaller particulates. As this constriction would
limit smaller particles from reaching the centrifuge, these
smaller particles were not provided the opportunity to be
spun in the centrifuge, where, dependent upon particle size,
may have been found in the centrate, leading to a higher %
of remaining solids. With this understanding, while mea-
surable, even when the feed rate was fully flushed, the %of
solids in the centrate remained consistent at 0.5–1% solids
by weight in the centrate. (Figure 15)
Comparison of the Differential RPM Between Bowl
and Scroll vs %Remaining Solids Still in the Centrate
Output of the Centrifuge
The centrifuge is equipped with a two frequency inverter
“Simp Drive,” which allows for stepless adjustment of the
scroll speed, permitting a fully automatic mode. Utilizing
the scroll’s differential RPM as the variable for these tests,
with a differential speed range of between 20RPM and
50RPM, it was found that there was no correlation between
the differential RPM and the solids remaining in the cen-
trate which indicates a propensity to allow for selection of a
Scroll Differential RPM that provides optimal energy utili-
zation. Once more, differential speed can permit additional
settling time in the bowl, for solid/liquid speration, which
Figure 15.
Figure 16.
becomes particularly advantageous in feed containing simi-
lar SG material requring separation (Figure 16).
Comparison of the Differential RPM Between Bowl
and scroll vs %Dryness of the Solids Output of the
Centrifuge
Once more, the differential RPM is utilized as the variable
for these series of tests. In this circumstance, we do not see
correlation between a higher differential RPM, and the %
of dryness of total solids in the cake produced from the cen-
trifuge. While there are certain portions of this test mirror-
ing correlation in the last 60 tests, the consistencies in a lack
of correlation in the first 50 tests confirm additional vari-
ables contributing to dryness of solids in the cake, beyond
differential speed. Removing outliers from variable testing
of other inputs, a consistent dry solids content of +80%
was achieved (Figure 17).
CONCLUSION
This had proved to be unique study, as the original inten-
tion was not to perform testing but rather to mimic a future
fulltime installation.
The pilot installation technical team had optimized
the equipment to the best possible settings to produce the