XXXI International Mineral Processing Congress 2024 Proceedings/Washington, DC/Sep 29–Oct 3 237
DoE was to determine whether there is a clear relationship
to the measured milling energy after high-voltage electrical
impulse treatment.
It is expected that the electrical impulse parameters,
impulse energy and frequency, are critical for the process.
Two other processing parameters are expected to have an
influence, namely the water flow rate and the feed of mate-
rial. Based on this, four controllable experimental factors
were defined and can be found in Table 3.
According to the Box-Behnken design, 24 factor level
combinations are required. To examine the experimental
error, the central point is conducted thrice, giving a total
of 27 experiments. A diagram showing the experimental
plan is shown in Figure 9. In this diagram the experimental
factors are identified.
The selected energy levels for every condition in combi-
nation with the impulse frequency result in a certain energy
input by electrical impulses, EEIT. The total energy ranges
from 0.44 kWh/t up to 8.75 kWh/t and the specific testing
conditions can be found in Table 4.
Also in Table 4, a summary of the measured difference
between the milled samples of raw granodiorite material
Raw
Material
Material after
electrical impulse
testing (EIT)
Material
Characterization:
Quantitative
Microstructural
Analysis (QMA)
Mechanical Testing
(PLT)
Particle Size
Distribution (PSD)
Material
Characterization:
Particle Size
Distribution (PSD)
Sv
EIT
Mineral Liberation
Analysis on selected
samples (Fraction:
1mm)
Milling Tests
Milling Tests
%Ered= (Emill-RAW-Emill-EIT)/Emill-RAW
Figure 7. Overview of the material characterization methods used for the comparative tests between EIT and Raw material
Table 2. Microstructural features and mechanical properties for granodiorite
Material Mineral Phases Avg. Grain Size, mm PLT, Is
(50) ,in MPa
Granodiorite Quartz, Feldspar, Mica 0.81 7.04
0 1mm
a b c
Source: Popov/TUBAF-IART
Figure 8. Thin sections photomicrographs of granodiorite from Kindisch (Saxony,
Germany). Magnification 16×
DoE was to determine whether there is a clear relationship
to the measured milling energy after high-voltage electrical
impulse treatment.
It is expected that the electrical impulse parameters,
impulse energy and frequency, are critical for the process.
Two other processing parameters are expected to have an
influence, namely the water flow rate and the feed of mate-
rial. Based on this, four controllable experimental factors
were defined and can be found in Table 3.
According to the Box-Behnken design, 24 factor level
combinations are required. To examine the experimental
error, the central point is conducted thrice, giving a total
of 27 experiments. A diagram showing the experimental
plan is shown in Figure 9. In this diagram the experimental
factors are identified.
The selected energy levels for every condition in combi-
nation with the impulse frequency result in a certain energy
input by electrical impulses, EEIT. The total energy ranges
from 0.44 kWh/t up to 8.75 kWh/t and the specific testing
conditions can be found in Table 4.
Also in Table 4, a summary of the measured difference
between the milled samples of raw granodiorite material
Raw
Material
Material after
electrical impulse
testing (EIT)
Material
Characterization:
Quantitative
Microstructural
Analysis (QMA)
Mechanical Testing
(PLT)
Particle Size
Distribution (PSD)
Material
Characterization:
Particle Size
Distribution (PSD)
Sv
EIT
Mineral Liberation
Analysis on selected
samples (Fraction:
1mm)
Milling Tests
Milling Tests
%Ered= (Emill-RAW-Emill-EIT)/Emill-RAW
Figure 7. Overview of the material characterization methods used for the comparative tests between EIT and Raw material
Table 2. Microstructural features and mechanical properties for granodiorite
Material Mineral Phases Avg. Grain Size, mm PLT, Is
(50) ,in MPa
Granodiorite Quartz, Feldspar, Mica 0.81 7.04
0 1mm
a b c
Source: Popov/TUBAF-IART
Figure 8. Thin sections photomicrographs of granodiorite from Kindisch (Saxony,
Germany). Magnification 16×