XXXI International Mineral Processing Congress 2024 Proceedings/Washington, DC/Sep 29–Oct 3 3813
It can also be seen that moisture 4% still brings positive
energy effects, since Wi values for HPGR products with
M =4% were each time lower, compared to M=2% at the
same F value. To evaluate the general effect of HPGR on
energy savings, the Wi index for the feed material was also
determined, which was Wi =12.70 kWh/Mg.
DISCUSSION AND SUMMARY
The results can be helpful for determination of some more
general relationships or models describing the behavior of
specific type of material under high-pressure grinding, as
well as evaluations of technological or economic effects of
HPGR operation.
The economic effect was associated with the Bond
working index Wi and the calculation of a necessary energy
for grinding in further technological operations. The
parameters F and M seem to have a positive impact on the
potential energy savings in the HPGR device for that type
of material. The relationship was presented in model (3)
and Figure 5. The values of Bonds work indices were the
lowest for the highest values of press force and the highest
moisture. In order to verify which factor: pressing force or
moisture, has a potentially higher effect on Wi, the specific
equation was determined by means of multiple regression
method (3).
.W F 1367 0 15 0.19M
i =--(3)
where: F is expressed in [kN], moisture, M is expressed
in [%],and Wi is expressed in [kWh/Mg]. Both indepen-
dent variables, i.e., F and M, are statistically significant on
the confidence level (1 α) =0.95. The model shows that
decreasing the pressing force by one unit (1 kN) results in
an increase in Wi by 0.15, while a decrease in M by 1%
results in increasing of Wi by 0.19. It can be concluded
0
1
2
3
4
5
6
7
8
9
10
0 10 20 30 40 50 60 70 80 90 100
Characteristic particle, x
Moisture 0%
Moisture 2%
Moisture 4%
Figure 4. Comminution ratios for HPGR products crushed at F=160 kN
Table 3. Values of Bond Wi indices for individual HPGR
products
Pressing Force,
F [kN]
Moisture Content, M
0% 2% 4%
10 12.42 11.67 11.17
13 11.62 11.23 10.92
16 11.39 10.97 10.63
Figure 5. Wi index as a function of pressure and moisture
Commi
tion
ratio,
Sx
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Extracted Text (may have errors)

XXXI International Mineral Processing Congress 2024 Proceedings/Washington, DC/Sep 29–Oct 3 3813
It can also be seen that moisture 4% still brings positive
energy effects, since Wi values for HPGR products with
M =4% were each time lower, compared to M=2% at the
same F value. To evaluate the general effect of HPGR on
energy savings, the Wi index for the feed material was also
determined, which was Wi =12.70 kWh/Mg.
DISCUSSION AND SUMMARY
The results can be helpful for determination of some more
general relationships or models describing the behavior of
specific type of material under high-pressure grinding, as
well as evaluations of technological or economic effects of
HPGR operation.
The economic effect was associated with the Bond
working index Wi and the calculation of a necessary energy
for grinding in further technological operations. The
parameters F and M seem to have a positive impact on the
potential energy savings in the HPGR device for that type
of material. The relationship was presented in model (3)
and Figure 5. The values of Bonds work indices were the
lowest for the highest values of press force and the highest
moisture. In order to verify which factor: pressing force or
moisture, has a potentially higher effect on Wi, the specific
equation was determined by means of multiple regression
method (3).
.W F 1367 0 15 0.19M
i =--(3)
where: F is expressed in [kN], moisture, M is expressed
in [%],and Wi is expressed in [kWh/Mg]. Both indepen-
dent variables, i.e., F and M, are statistically significant on
the confidence level (1 α) =0.95. The model shows that
decreasing the pressing force by one unit (1 kN) results in
an increase in Wi by 0.15, while a decrease in M by 1%
results in increasing of Wi by 0.19. It can be concluded
0
1
2
3
4
5
6
7
8
9
10
0 10 20 30 40 50 60 70 80 90 100
Characteristic particle, x
Moisture 0%
Moisture 2%
Moisture 4%
Figure 4. Comminution ratios for HPGR products crushed at F=160 kN
Table 3. Values of Bond Wi indices for individual HPGR
products
Pressing Force,
F [kN]
Moisture Content, M
0% 2% 4%
10 12.42 11.67 11.17
13 11.62 11.23 10.92
16 11.39 10.97 10.63
Figure 5. Wi index as a function of pressure and moisture
Commi
tion
ratio,
Sx

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