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REAGENT OPTIMIZATION
Mototolo JV Concentrator
Mzwanele Mosala
13 January 2016
PLATINUM
2
SAFETY
INTRODUCTION
PROBLEM STATEMENT
MOTIVATION
OBJECTIVES
METHODOLOGY
RESULTS & DISCUSSION
CONCLUSION
RECOMMENDATIONS
PRESENTATION LAYOUT
PLATINUM
3
● LOST TIME INJURY FREE DAYS : 1522
● MEDICAL TREATMENT CASE : 119
● ENVIRONMENTAL INCIDENT FREE DAYS : 1309
RESILIENT
PROACTIVE
COMPLIANT
REACTIVE
BASIC
SAFETY
PLATINUM
4
INTRODUCTION
PLATINUM
INTRODUCTION
● Mototolo JV Concentrator is a platinum processing plant which treats UG2 ore.
● Designed to treat 200 000ktpm at 3,35g/t
● Plant configuration; MF2
5
PLATINUM
• Head grade received from the mine ~= 3 g/t
• Due to the low head grade;
● Low recovery
● BP ounces not achieved
PROBLEM STATEMENT
PLATINUM
• Increased throughput to 340tph (BP OUNCES STILL NOT MET)
• Cannot go beyond throughput of 340t/h (BOTTLENECKS ON
EQUIPMENT)
PROBLEM STATEMENT
PLATINUM
LEVERS
● Grind (On target)
● Cell operating parameters
● Reagents
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MOTIVATION
MUST Recovery
PLATINUM
● Switching the depressant while maintaining same dosage at Bathopele showed positive
9
MOTIVATION
PLATINUM
t-Test: Two-Sample Assuming Equal Variances
● No significant improvement on primary rougher recovery
● Primary rougher recovery ( and grade) to be improved
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Parameter Rougher
Norilose
Rougher
No
Norilose
Mean 70.20 69.64
P( T<=t)
one tail
0.2914
Confidence 70.85
Parameter Cleaner
Norilose
Cleaner
No
Norilose
Mean 93.49 91.32
P( T<=t)
one tail
0.000179
Confidence 99.98
MOTIVATION
PLATINUM
●To get optimal reagent regime (INTERACTIVE EFFECTS OF REAGENTS)
●Improve plant recovery
●Meeting business plan ounces
OBJECTIVE
PLATINUM
12
METHODOLOGY
PLATINUM
• 2^k Factorial design
• 3 input variables ; Frother, Collector & Depressant.
• Where A= frother, B= collector, C depressant.
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METHODOLOGY
PLATINUM
METHODOLOGY
Norilose
PLATINUM
15
Reagent Dosages
Low level 40% < target, High levels 40% > target.
8 runs + base at A 12g/t, B 150g/t, C 40g/t.
Lab Scale Flotation Cell
PLATINUM
16
RESULTS AND DISCUSSIONCATE
PLATINUM
RESULTS AND DISCUSSION
Cube Plot
Recovery at base = 80.10%
PLATINUM
RESULTS AND DISCUSSIONAnalysis
Main effects: Depressant > Frother > Collector
Two-way interaction effects: Frother*Depressant > Collector* Depressant
Term Effect P Value
Frother 2.09 0.006
Collector 0.76 0.045
Depressant 2.25 0.005
Frother*Depressa
nt 4.56 0.001
Collector*Depres
sant 1.50 0.012
PLATINUM
RESULTS AND DISCUSSION
Recovery increased by selectivity
PLATINUM
RESULTS AND DISCUSSION
Optimization
Keeping collector at 150g/t, frother at 15g/t, Depressant at 56g/t.
High recovery achieved = 80%
Collector 150
Hold Values80
79
78
77
76
76
75
Frother
Dep
ress
ant
1615141312111098
55
50
45
40
35
30
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Contour Plot of Recovery vs Depressant, Frother
PLATINUM
● Rougher recovery improved by
selectivity
● Shifts the grade-recovery curve
● Due to Norilose properties.
● Reagent regime obtained
21
Conclusion
PLATINUM
● Check concentration of frother in process water.
● Previous test 12.75ppm frother in process water.
● This changes from time to time, needs continuous monitoring.
● Increase depressant dosage to 56g/t and frother to obtained results from CCC.
● Put the test on a plant scale
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Recommendations
PLATINUM
23
THANKYOU