3804 XXXI International Mineral Processing Congress 2024 Proceedings/Washington, DC/Sep 29–Oct 3
one year and can be up to or beyond 2.5 years (Burchardt
&Mackert, 2019). Given these improvements the issues
of liner wear have been overcome and are manageable
(Klymowsky 2003).
Missing Feasibility Scale Test
The Bond Ball Mill Test and SAGDesign are long-estab-
lished and well-trusted methods for ball mill and SAG mill
sizing (Amelunxen et al., 2014 Bond 1961). Given HPGR’s
early lack of equivalent compressive breakage laboratory
tests, HPGR can be overlooked during feasibility studies.
The fully established testing method to check viability of
HPGR is pilot testing which requires significant amounts
of material (Seidel et al., 2006). While validated models for
HPGR exist (M. J. Daniel &Morley, 2010 Morrell 2022),
the abundance of available methods suggests a lack of a uni-
versally accepted small-scale laboratory test for predicting
HPGR energy and sizing requirements (M. Daniel, 2007
Davaanyam 2015 Gognon et al., 2022). The Piston-die
Press Test (PPT) has been proposed and designed to fill
this purpose (Bulled &Husain, 2008 Davaanyam 2015
Davaanyam et al., 2013). Works expanding upon the initial
PPT procedure developed a locked cycle method for the
PPT (Gagnon et al., 2021 Kumar et al., 2023 Pamparana
&Klein, 2021). There are concerns with the PPT test,
including uneven treatment of sample layers contained
within the press leading to inconsistent treatment, and
appropriate selection of sample volume for a given ore and
press setup (Bulled &Husain, 2008 Davaanyam 2015).
Requisite for Low Moisture Conditions
Concerns exist regarding HPGR requirement for ores to be
dry, the thought process being that conventional commi-
nution circuits required wet grinding stages and introduc-
tion of the dry operating HPGR would require significant
reorientation of overall circuit design (Davaanyam 2015).
Addressing these concerns, it has been shown that circuit
reconfiguration to dry methods can still generate advantages
Source: Demir Engineering
Figure 4. Roll studs added to improve roll life
Source: Demir Engineering
Figure 5. Relationship of HPGR feed characteristics and appropriate stud hardness
one year and can be up to or beyond 2.5 years (Burchardt
&Mackert, 2019). Given these improvements the issues
of liner wear have been overcome and are manageable
(Klymowsky 2003).
Missing Feasibility Scale Test
The Bond Ball Mill Test and SAGDesign are long-estab-
lished and well-trusted methods for ball mill and SAG mill
sizing (Amelunxen et al., 2014 Bond 1961). Given HPGR’s
early lack of equivalent compressive breakage laboratory
tests, HPGR can be overlooked during feasibility studies.
The fully established testing method to check viability of
HPGR is pilot testing which requires significant amounts
of material (Seidel et al., 2006). While validated models for
HPGR exist (M. J. Daniel &Morley, 2010 Morrell 2022),
the abundance of available methods suggests a lack of a uni-
versally accepted small-scale laboratory test for predicting
HPGR energy and sizing requirements (M. Daniel, 2007
Davaanyam 2015 Gognon et al., 2022). The Piston-die
Press Test (PPT) has been proposed and designed to fill
this purpose (Bulled &Husain, 2008 Davaanyam 2015
Davaanyam et al., 2013). Works expanding upon the initial
PPT procedure developed a locked cycle method for the
PPT (Gagnon et al., 2021 Kumar et al., 2023 Pamparana
&Klein, 2021). There are concerns with the PPT test,
including uneven treatment of sample layers contained
within the press leading to inconsistent treatment, and
appropriate selection of sample volume for a given ore and
press setup (Bulled &Husain, 2008 Davaanyam 2015).
Requisite for Low Moisture Conditions
Concerns exist regarding HPGR requirement for ores to be
dry, the thought process being that conventional commi-
nution circuits required wet grinding stages and introduc-
tion of the dry operating HPGR would require significant
reorientation of overall circuit design (Davaanyam 2015).
Addressing these concerns, it has been shown that circuit
reconfiguration to dry methods can still generate advantages
Source: Demir Engineering
Figure 4. Roll studs added to improve roll life
Source: Demir Engineering
Figure 5. Relationship of HPGR feed characteristics and appropriate stud hardness