XXXI International Mineral Processing Congress 2024 Proceedings/Washington, DC/Sep 29–Oct 3 2969
Figure 7. Probability plot for overall Cu recovery—(A) Overall (B) +150µm (C) –150µm
The population was 8 and all plots follow a normal
distribution:
• For the overall mass pull, the probability plot shows
that the p-value (0.891) is greater than the the sig-
nificance level (0.05), meaning the null hypothesis
has failed to be rejected and the data set should be
considered normally distributed. Most of the data
follows the fitted distribution line. The mean Cu
recovery was 74,07% with a standard deviation of
6,1%.
• For the +150µm, the probability plot shows that the
p-value 0.201 (normally distributed) with most of
the data following the fitted distribution line. The
mean Cu recovery was 61,66% with a standard devi-
ation of 6,4%.
• For the –150µm the probability plot shows that the
p-value is 0.759 (normally distributed) with most of
the data following the fitted distribution line. The
mean Cu recovery was 82,55% with a standard devi-
ation of 6,9%.
Figures 8 illustrates the variables effects on Cu recovery.
For the levels tested, the variables affected the Cu
recovery as following:
• the froth level and frother had the most significant
effect on Cu recovery in all fractions.
• The Jg, affected mainly the fines fraction recovery but
at the lowest level compared to the other variables.
• The increase in the collector dosage was favorable
for the coarse particles recovery (+150µm), how-
ever it reduced the recoveries in the fines particles
(–150µm).
Based on the results achieved with the half factorial
design tests, the conditions for test 6 were noted as achiev-
ing the highest recovery. A repeat of that test was performed
(test 9). A new test condition was also added, to maxi-
mize Cu recovery in the coarse fraction (test 10). This was
accomplished by increasing the froth level to 400mm. A
repeat test for this condition was also performed (test 11).
Table 2 shows the additional tests results:
Figure 7. Probability plot for overall Cu recovery—(A) Overall (B) +150µm (C) –150µm
The population was 8 and all plots follow a normal
distribution:
• For the overall mass pull, the probability plot shows
that the p-value (0.891) is greater than the the sig-
nificance level (0.05), meaning the null hypothesis
has failed to be rejected and the data set should be
considered normally distributed. Most of the data
follows the fitted distribution line. The mean Cu
recovery was 74,07% with a standard deviation of
6,1%.
• For the +150µm, the probability plot shows that the
p-value 0.201 (normally distributed) with most of
the data following the fitted distribution line. The
mean Cu recovery was 61,66% with a standard devi-
ation of 6,4%.
• For the –150µm the probability plot shows that the
p-value is 0.759 (normally distributed) with most of
the data following the fitted distribution line. The
mean Cu recovery was 82,55% with a standard devi-
ation of 6,9%.
Figures 8 illustrates the variables effects on Cu recovery.
For the levels tested, the variables affected the Cu
recovery as following:
• the froth level and frother had the most significant
effect on Cu recovery in all fractions.
• The Jg, affected mainly the fines fraction recovery but
at the lowest level compared to the other variables.
• The increase in the collector dosage was favorable
for the coarse particles recovery (+150µm), how-
ever it reduced the recoveries in the fines particles
(–150µm).
Based on the results achieved with the half factorial
design tests, the conditions for test 6 were noted as achiev-
ing the highest recovery. A repeat of that test was performed
(test 9). A new test condition was also added, to maxi-
mize Cu recovery in the coarse fraction (test 10). This was
accomplished by increasing the froth level to 400mm. A
repeat test for this condition was also performed (test 11).
Table 2 shows the additional tests results: