542 XXXI International Mineral Processing Congress 2024 Proceedings/Washington, DC/Sep 29–Oct 3
and are guided by the grit cone to the center of the grinding
table for further comminution.
Rapid high energy grinding followed by classification
produces a narrow particle size distribution which results
in reduced amounts of ultra-fines. A small amount of very
coarse material, so-called reject, is not levitated at the edge
of the grinding table and it falls through the upward mov-
ing gas into a chute discharge (6) where it is removed. The
rejects are recycled to the mill feed by the reject conveying
system.
A typical simplified flow sheet for the air flow process is
illustrated in Figure 4.
TEST MATERIAL AND GEOMETALLURGY
Drilling was done in 2010 and some cores were drilled at
150 mm diameter and some at 83 mm (PQ) size. These
drill samples have subsequently been used for all the testing
since, across more than a decade.
Typical core produced by drilling is shown in Figure 5.
The competent nature of this core caused comminu-
tion difficulty and was part of the reason it was useful for
metallurgical test work over such an extended period. The
drilled mass from this program was more than 40 t. The
set of properties illustrated in Table 1 are typical of the
Southdown ore.
Figure 4. Simplified VRM flow sheet with main air pathway through mill and classifier (8), filter bag house (11), fan (12) and
stack (13)
Figure 5. 150 mm diamond core for metallurgical test work
and are guided by the grit cone to the center of the grinding
table for further comminution.
Rapid high energy grinding followed by classification
produces a narrow particle size distribution which results
in reduced amounts of ultra-fines. A small amount of very
coarse material, so-called reject, is not levitated at the edge
of the grinding table and it falls through the upward mov-
ing gas into a chute discharge (6) where it is removed. The
rejects are recycled to the mill feed by the reject conveying
system.
A typical simplified flow sheet for the air flow process is
illustrated in Figure 4.
TEST MATERIAL AND GEOMETALLURGY
Drilling was done in 2010 and some cores were drilled at
150 mm diameter and some at 83 mm (PQ) size. These
drill samples have subsequently been used for all the testing
since, across more than a decade.
Typical core produced by drilling is shown in Figure 5.
The competent nature of this core caused comminu-
tion difficulty and was part of the reason it was useful for
metallurgical test work over such an extended period. The
drilled mass from this program was more than 40 t. The
set of properties illustrated in Table 1 are typical of the
Southdown ore.
Figure 4. Simplified VRM flow sheet with main air pathway through mill and classifier (8), filter bag house (11), fan (12) and
stack (13)
Figure 5. 150 mm diamond core for metallurgical test work