grinding survey presentation report- baya june 2015
TRANSCRIPT
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CIRCUIT DESCRIPTION
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PROJECT OBJECTIVES
Grinding Survey has been done in order to
achieve the following objectives for the
grinding circuit:
Gold distribution through each size
friction.
Transfer size, calculate the P80 for
cyclone, and all Mills
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INTRODUCTION
Grinding survey has been done in 20th of June 2015
for 4 hours and samples collected from different
spots:
B.M.1 and B.M.2 discharge Cyclone feed &
Cyclone O/F &Cyclone U/F to B.M.1 and Cyclone
U/F to B.M.2
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INTRODUCTION CONT…
CV03 (SAG Mill Scats)
CV04 (Pebble Crusher Discharge)
SAG Discharge
CV02 (SAG Mill Feed Conveyor)
By collecting these samples we can achieve the
survey objectives
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EXPERIMENTAL WORKS
Samples collecting Technique
CV02: 1M belt cut from conveyor
CV03: 1 Drum from the Pebble Crusher
Feed shut about 50 Kg
CV04 1 Drum from the Pebble Crusher
Discharge shut about 50 Kg
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EXPERIMENTAL PROCEDURE CONT…
B.M Discharge: 1L every 30 min for 4 hours,
sample were collected from normal point of BM
discharge sample SG
Cyclone O/F: 1L every 30 min for 4 hours,
samples were collected from trush Sc. Feed Box.
Cyclone U/F: 1L every 30 min for 4 hr, sample
were collected from BM feed hopper
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SAG Discharge: 1L every 30 min for 4 hr samples were
collected from normal point of SAG Discharge sample
SG
Cyclone Feed: 1L every 30 min for 4 hr sample were
collected by opening the cyclone Feed valve slowly so
the cyclone to give only U/F (This U/F is representative
for the cyclone Feed.
EXPERIMENTAL PROCEDURE CONT…
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FINDINGS
BM1&2 discharge looks similar same applies to their feed
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RESULTS CONT…
Poor performance of p crusher since P80=CV03,Also crusher P80=35mm which is above the target of 25mm
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RESULTS CONT…
Cyclone P80 =116µ
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CIRCUIT AVARAGE GOLD DISTRIBUTION
CV02 CV03 PEBBLE D SAG D BMI D BMII D CYCLONE F BMI F BMII F CYCLONE OVERFLOW
0
2
4
6
8
10
12
14
16
18
20
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CONCLUSIONS
P80 of cyclone O/F =106μ and the result coming from survey is 116μ which is very close to target and good indication about cyclone performance.
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RECOMMENDATION
Therefore, Water balance of grinding circuit need
some adjustment in order to decrease % Solids of O/F
to be 50% by adjust cyclone feed to 68% Solids and
U/F to 76% solids.
In order to improve our grinding efficiency we need to
adjust Cyclone recycle load to increase separation
process across cyclone.
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RECOMMENDATION CONT…
Adjust required %Solids across cyclone
streams to drop recycle load to required
target.
Daily adjustment of the pebble crusher gap.
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STOP!!
Thanks for your attention