Comminution (Size reduction). Special forces Outer forces Mechanical comminution.
Coalition for Eco-Efficient Comminution
description
Transcript of Coalition for Eco-Efficient Comminution
![Page 1: Coalition for Eco-Efficient Comminution](https://reader034.fdocuments.in/reader034/viewer/2022051518/56815d9f550346895dcbc82f/html5/thumbnails/1.jpg)
Coalition for Eco-Efficient Comminution
![Page 2: Coalition for Eco-Efficient Comminution](https://reader034.fdocuments.in/reader034/viewer/2022051518/56815d9f550346895dcbc82f/html5/thumbnails/2.jpg)
VisionTo accelerate implementation of eco-efficient comminution strategies through promotion of
research, data and industry benefits
![Page 3: Coalition for Eco-Efficient Comminution](https://reader034.fdocuments.in/reader034/viewer/2022051518/56815d9f550346895dcbc82f/html5/thumbnails/3.jpg)
Patron Owen Hegarty G-Resources Group
BoardChair Elizabeth Lewis-Gray Gekko
SystemsDirector Prof Tim Napier-Munn JKMRC Director Dr Wayne Stange AMIRADirector Dr Mike Daniel CMD ConsultingDirector Dr Zeljka Pokrajcic Worley Parsons
![Page 4: Coalition for Eco-Efficient Comminution](https://reader034.fdocuments.in/reader034/viewer/2022051518/56815d9f550346895dcbc82f/html5/thumbnails/4.jpg)
CEEC Sponsors
![Page 5: Coalition for Eco-Efficient Comminution](https://reader034.fdocuments.in/reader034/viewer/2022051518/56815d9f550346895dcbc82f/html5/thumbnails/5.jpg)
Comminution Energy Consumption
4 – 9% Australia’s electricity consumption
30 – 40% total mine
Source: CSRP Eco-Efficient Liberation – Outcomes and Benefits 2003-2010
![Page 6: Coalition for Eco-Efficient Comminution](https://reader034.fdocuments.in/reader034/viewer/2022051518/56815d9f550346895dcbc82f/html5/thumbnails/6.jpg)
Comminution Energy Consumption
CO2 contributions for the stages of copper concentrate production, Source: Norgate and Haque, 2010
![Page 7: Coalition for Eco-Efficient Comminution](https://reader034.fdocuments.in/reader034/viewer/2022051518/56815d9f550346895dcbc82f/html5/thumbnails/7.jpg)
0
5,000
10,000
15,000
20,000
25,000
30,000
35,000
40,000
tonn
es C
O2 (e
)Lo
ad &
Tru
ckin
gDr
illin
gTr
amm
ing
Serv
ices
Cre
ws
Pers
y Ca
ge W
inde
r
Pers
y Sk
ip W
inde
r
Pers
y Un
derg
roun
d
Pers
y Ve
ntill
atio
n
Rock
y's
Rew
ard
Crus
hing
(sur
face
)Gr
indi
ngFl
otat
ion
Reag
ents
Conc
entra
te D
ryin
g
Filte
rs/D
rier A
rea
Taili
ngs
Conc
. Tra
nspo
rt
Site
Ser
vice
s,A.
..En
gin
& M
aint
.
Com
pres
sed
Air
Proc
ess
Wat
erPo
tabl
e W
ater
Bore
field
Othe
r,Adm
in e
tc
1999 Leinster Nickel Operations CO2 Emissions
Sulphur
Kerosene
Coke
LPG
Petrol
Diesel
Electricity
NaturalGas
Typical site comminution energy footprint
Source Le Nause, Temos 1992
![Page 8: Coalition for Eco-Efficient Comminution](https://reader034.fdocuments.in/reader034/viewer/2022051518/56815d9f550346895dcbc82f/html5/thumbnails/8.jpg)
• Understand mineral and gangue liberation characteristics
• Reject gangue or recover mineral in crushing step, prior to milling
• Recover mineral or gangue at coarsest particle size
• More crushing less grinding• Utilise new and more energy
efficient technologies
Eco Efficient strategies
![Page 9: Coalition for Eco-Efficient Comminution](https://reader034.fdocuments.in/reader034/viewer/2022051518/56815d9f550346895dcbc82f/html5/thumbnails/9.jpg)
Selection of the coarsest possible grind size
Energy & grind size
1.E-01
1.E+00
1.E+01
1.E+02
1.E+03
1.E+04
1.E+05
1.0E-02 1.0E-01 1.0E+00 1.0E+01 1.0E+02 1.0E+03 1.0E+04
Particle Size (micron)
Ener
gy (k
Wh/
t)
Source: Hukki RT, 1961
![Page 10: Coalition for Eco-Efficient Comminution](https://reader034.fdocuments.in/reader034/viewer/2022051518/56815d9f550346895dcbc82f/html5/thumbnails/10.jpg)
Optimum liberation
![Page 11: Coalition for Eco-Efficient Comminution](https://reader034.fdocuments.in/reader034/viewer/2022051518/56815d9f550346895dcbc82f/html5/thumbnails/11.jpg)
Coarser grind may improve recovery
![Page 12: Coalition for Eco-Efficient Comminution](https://reader034.fdocuments.in/reader034/viewer/2022051518/56815d9f550346895dcbc82f/html5/thumbnails/12.jpg)
More crushing – less grinding
• Ball mills only apply 5% of energy used to particle size reduction
• Fine crushing is more energy efficient
• Very low power consumed in supporting systems such as pumping and conveyors
![Page 13: Coalition for Eco-Efficient Comminution](https://reader034.fdocuments.in/reader034/viewer/2022051518/56815d9f550346895dcbc82f/html5/thumbnails/13.jpg)
“The most efficient way to break rock, is not to
break rock at all”
Dr Rob Morrison, JKMRC
![Page 14: Coalition for Eco-Efficient Comminution](https://reader034.fdocuments.in/reader034/viewer/2022051518/56815d9f550346895dcbc82f/html5/thumbnails/14.jpg)
• Blasting– Optimise fragmentation to maximise
fines in ROM ore– “Bricks and mortar”
• Screening:– ahead of, and in, the grinding circuit
• Gangue Rejection• Pre-concentration• Concentration
Improved ore presentation and flow sheets
![Page 15: Coalition for Eco-Efficient Comminution](https://reader034.fdocuments.in/reader034/viewer/2022051518/56815d9f550346895dcbc82f/html5/thumbnails/15.jpg)
• Fine crushing– VSI– HPGR
• Fine Screening• Ore Sorting• Gravity – continuous & batch
– InLine Pressure Jig– Centrifugal Concentrators
• Coarse Flotation
Improving technologies
![Page 16: Coalition for Eco-Efficient Comminution](https://reader034.fdocuments.in/reader034/viewer/2022051518/56815d9f550346895dcbc82f/html5/thumbnails/16.jpg)
Castlemaine Goldfields plant
![Page 17: Coalition for Eco-Efficient Comminution](https://reader034.fdocuments.in/reader034/viewer/2022051518/56815d9f550346895dcbc82f/html5/thumbnails/17.jpg)
New flowsheet with gangue rejection
• Recovery increased by maximising gravity recovery, finer grind, increased head grade to process plant.
Unit: CONVENTIONALWITH
PRECONC. Change:
Material Treated: Mt 21 21Grade:Au g/t 0.82 0.82
Contained Au: oz 554,000 554,000Gangue Rejection: Mt - 10
g/t - 0.13oz - 41,150
Process Plant Feed: Mt 21 11g/t 0.82 1.45oz 554,000 512,850
Production: oz 415,000 435,900 5%Process Plant Recovery: 74.9% 85.0%
Overall Recovery: 74.9% 78.7%Average Processing Power Demand: MW 68 50 -27%
Energy Effi ciency for gold produced MWhr/oz 1.44 1.01 30%Energy Effi ciency for ore treated: kWhr/t 28.5 20.9 27%
![Page 18: Coalition for Eco-Efficient Comminution](https://reader034.fdocuments.in/reader034/viewer/2022051518/56815d9f550346895dcbc82f/html5/thumbnails/18.jpg)
Benefits of New Process for site
• Lower Capital Cost for Greenfields Installation• Net reduction in energy consumption• Increased gold recovery• Increased gold production• Reduced $/oz operating cost of gold produced
![Page 19: Coalition for Eco-Efficient Comminution](https://reader034.fdocuments.in/reader034/viewer/2022051518/56815d9f550346895dcbc82f/html5/thumbnails/19.jpg)
CEEC Linked In discussion page
![Page 20: Coalition for Eco-Efficient Comminution](https://reader034.fdocuments.in/reader034/viewer/2022051518/56815d9f550346895dcbc82f/html5/thumbnails/20.jpg)
CEEC Linked In Discussions
• Ore sorting• Microwave technology• Blasting techniques• Comminution research• Conference blogs
![Page 21: Coalition for Eco-Efficient Comminution](https://reader034.fdocuments.in/reader034/viewer/2022051518/56815d9f550346895dcbc82f/html5/thumbnails/21.jpg)
CEEC – Website Home Page
![Page 22: Coalition for Eco-Efficient Comminution](https://reader034.fdocuments.in/reader034/viewer/2022051518/56815d9f550346895dcbc82f/html5/thumbnails/22.jpg)
CEEC – Key Papers
![Page 23: Coalition for Eco-Efficient Comminution](https://reader034.fdocuments.in/reader034/viewer/2022051518/56815d9f550346895dcbc82f/html5/thumbnails/23.jpg)
CEEC Sponsors
![Page 24: Coalition for Eco-Efficient Comminution](https://reader034.fdocuments.in/reader034/viewer/2022051518/56815d9f550346895dcbc82f/html5/thumbnails/24.jpg)
End