XXXI International Mineral Processing Congress 2024 Proceedings/Washington, DC/Sep 29–Oct 3 265
undertaken to demonstrate proof-of-concept and the feasi-
bility of the JK Grizzly concept is presented in the follow-
ing sections.
NOVEL ELECTRODE-GRIZZLY—PROOF
OF CONCEPT
A stage-wise approach was undertaken to prove and dem-
onstrate the operation of the electrode-grizzly concept. The
ability to break ore, promote selective breakage, achieve
pre-concentration, and energy usage was tested firstly in
batch mode and then in semi-continuous mode.
Experiments were undertaken at the HVP Flexible
Testing Facility at the JKMRC, Brisbane, Australia. A
facility consisting of a bespoke HVP Generator built by
Huazhong University of Science and Technology (HUST),
specialty power measurement equipment, and material
handling devices. The facility is capable of testing different
HVP conditions, processing vessels, and electrode designs.
Figure 5 shows a schematic of the system installed in the
HVP Flexible Testing Facility and used to perform this
work.
Samples were subjected to HVP discharges using an
electrode-grizzly assembly constructed at the JKMRC con-
nected to the HUST generator. The generator uses a pulse
transformer to output high voltages. The high voltage and
the ground terminals from the HUST generator were con-
nected to the grizzly electrode bars fabricated from stain-
less steel. Charging voltage increments (1 to 5 kV) were set
using the control computer in the primary circuit, which
is transformed to higher output voltages at the processing
zone. The voltage pulse rise time is 500 ns.
Batch Testing
For batch mode testing, a 500 mm two-bar electrode-griz-
zly unit was used for the experiments. Figure 6 illustrates
the arrangement utilized for the tests, which incorporated a
guide rail to prevent particles from jumping out of the bars
following a discharge.
Figure 5. Schematic representation of the system used to perform the work
Figure 6. Two-bar electrode-grizzly set-up with guide rail used for batch tests
undertaken to demonstrate proof-of-concept and the feasi-
bility of the JK Grizzly concept is presented in the follow-
ing sections.
NOVEL ELECTRODE-GRIZZLY—PROOF
OF CONCEPT
A stage-wise approach was undertaken to prove and dem-
onstrate the operation of the electrode-grizzly concept. The
ability to break ore, promote selective breakage, achieve
pre-concentration, and energy usage was tested firstly in
batch mode and then in semi-continuous mode.
Experiments were undertaken at the HVP Flexible
Testing Facility at the JKMRC, Brisbane, Australia. A
facility consisting of a bespoke HVP Generator built by
Huazhong University of Science and Technology (HUST),
specialty power measurement equipment, and material
handling devices. The facility is capable of testing different
HVP conditions, processing vessels, and electrode designs.
Figure 5 shows a schematic of the system installed in the
HVP Flexible Testing Facility and used to perform this
work.
Samples were subjected to HVP discharges using an
electrode-grizzly assembly constructed at the JKMRC con-
nected to the HUST generator. The generator uses a pulse
transformer to output high voltages. The high voltage and
the ground terminals from the HUST generator were con-
nected to the grizzly electrode bars fabricated from stain-
less steel. Charging voltage increments (1 to 5 kV) were set
using the control computer in the primary circuit, which
is transformed to higher output voltages at the processing
zone. The voltage pulse rise time is 500 ns.
Batch Testing
For batch mode testing, a 500 mm two-bar electrode-griz-
zly unit was used for the experiments. Figure 6 illustrates
the arrangement utilized for the tests, which incorporated a
guide rail to prevent particles from jumping out of the bars
following a discharge.
Figure 5. Schematic representation of the system used to perform the work
Figure 6. Two-bar electrode-grizzly set-up with guide rail used for batch tests