grinding survey presentation report- baya june 2015

CIRCUIT DESCRIPTION

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

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

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

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

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

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…

FINDINGS

BM1&2 discharge looks similar same applies to their feed

RESULTS CONT…

Poor performance of p crusher since P80=CV03,Also crusher P80=35mm which is above the target of 25mm

RESULTS CONT…

Cyclone P80 =116µ

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

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.

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.

RECOMMENDATION CONT…

Adjust required %Solids across cyclone

streams to drop recycle load to required

target.

Daily adjustment of the pebble crusher gap.

STOP!!

Thanks for your attention