XXXI International Mineral Processing Congress 2024 Proceedings/Washington, DC/Sep 29–Oct 3 2931
together. The cleaner feed responded well to the precondi-
tioning in the Mach, as evidenced by the greater selectiv-
ity—mass pulls being reduced by between 5 and 11%—and
higher grades obtained at 10, 20 and 30 passes through the
Reactor. Here, a bench residence time of 14 minutes (cor-
responding with the third concentrate) served as reference
point, the residence time of the cleaner bank in the plant
being around 36 minutes.
Despite the higher calculated feed grades for the cleaner
tests with the Mach Reactor – an average of around 7.5 g/t
vs the 6.9 g/t of the baseline – the upgrade ratios were
improved throughout due to the reduced mass pulls. The
-40
-30
-20
-10
0
10
20
30
-30 -20 -10 0 10 20 30
Mass pull diff. (%)
0 Pass 10 Pass 20 Pass 30 Pass
Figure 6. Recovery-mass pull differential profiles for the Cleaner feed (14 minute
reference)
-10
0
10
20
30
-50 -40 -30 -20 -10 0 10 20 30
4E Recovery diff. (%)
0 Pass 10 Pass 20 Pass 30 Pass
Figure 7. Grade-recovery differential profiles for the Cleaner feed
4E
Recovery
d
.
(%)
4E
Grade
d
.
(g/t)