XXXI International Mineral Processing Congress 2024 Proceedings/Washington, DC/Sep 29–Oct 3 1087
formulas, four digital helpers have been devised and can be
implemented to assist in the smooth operation of the roller
press. The four examples of these types of digital helpers are
described below.
Screw Control for Uniform Compacting Results
The first digital helper examined is used in the application
of roller compaction. In compaction-granulation, the prod-
uct of a roller press is only an intermediate stage in the pro-
cess. In downstream process steps, the roller press product
is crushed, screened, and partly reprocessed until the final
granules can be classified to their desired particle size, for
example +2 mm to +4 mm. The granulated product must
also meet other specifications based on flake density and
strength of the individual granules. These variables must be
considered during optimization in addition to maintaining
a high yield of the desired 2/4 mm product as a way to
maximize cost efficiency.
Compaction pressure and the gap of the roller press
have a strong impact on the flake properties during proper
circuit conditions. Figure 7 shows the abrasion resistance of
potash granules produced with three different specific forces
and at three different gap sizes. In this case, it is observed
that this resistance is mainly dependent on the compacting
pressure, not the operating gap. When subjected to a higher
pressure, granules with greater strength can be produced.
Figure 7 indicates that the abrasive resistance is only slightly
sensitive with respect to changes in gap size.
Other product properties are more dependent on
roller gap size. An example concerning the flake densities is
shown in Figure 8. In this case, the material and compac-
tion settings are identical to those above. A smaller gap size
Figure 7. Abrasion resistance in dependence of gap size and compacting force
Figure 8. Flake density in dependence of gap size and compacting force
formulas, four digital helpers have been devised and can be
implemented to assist in the smooth operation of the roller
press. The four examples of these types of digital helpers are
described below.
Screw Control for Uniform Compacting Results
The first digital helper examined is used in the application
of roller compaction. In compaction-granulation, the prod-
uct of a roller press is only an intermediate stage in the pro-
cess. In downstream process steps, the roller press product
is crushed, screened, and partly reprocessed until the final
granules can be classified to their desired particle size, for
example +2 mm to +4 mm. The granulated product must
also meet other specifications based on flake density and
strength of the individual granules. These variables must be
considered during optimization in addition to maintaining
a high yield of the desired 2/4 mm product as a way to
maximize cost efficiency.
Compaction pressure and the gap of the roller press
have a strong impact on the flake properties during proper
circuit conditions. Figure 7 shows the abrasion resistance of
potash granules produced with three different specific forces
and at three different gap sizes. In this case, it is observed
that this resistance is mainly dependent on the compacting
pressure, not the operating gap. When subjected to a higher
pressure, granules with greater strength can be produced.
Figure 7 indicates that the abrasive resistance is only slightly
sensitive with respect to changes in gap size.
Other product properties are more dependent on
roller gap size. An example concerning the flake densities is
shown in Figure 8. In this case, the material and compac-
tion settings are identical to those above. A smaller gap size
Figure 7. Abrasion resistance in dependence of gap size and compacting force
Figure 8. Flake density in dependence of gap size and compacting force