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Coalition for Eco-Efficient Comminution

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Coalition for Eco-Efficient Comminution. Vision To accelerate implementation of eco-efficient comminution strategies through promotion of research, data and industry benefits. Patron Owen Hegarty G-Resources Group Board Chair Elizabeth Lewis-Gray Gekko Systems

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Presentation Transcript
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VisionTo accelerate implementation of eco-efficient comminution strategies through promotion of research, data and industry benefits
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Patron Owen Hegarty G-Resources Group

Board

Chair Elizabeth Lewis-Gray Gekko Systems

Director Prof Tim Napier-Munn JKMRC

Director Dr Wayne Stange AMIRA

Director Dr Mike Daniel CMD Consulting

Director Dr Zeljka Pokrajcic Worley Parsons

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30 – 40% total mine

4 – 9% Australia’s electricity consumption

Comminution Energy Consumption

Source: CSRP Eco-Efficient Liberation – Outcomes and Benefits 2003-2010

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Comminution Energy Consumption

CO2 contributions for the stages of copper concentrate production, Source: Norgate and Haque, 2010

eco efficient strategies
Eco Efficient strategies
  • 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
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Energy & grind size

Selection of the coarsest possible grind size

Source: Hukki RT, 1961

more crushing less grinding
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
improved ore presentation and flow sheets
Improved ore presentation and flow sheets
  • 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
improving technologies
Improving technologies
  • Fine crushing
    • VSI
    • HPGR
  • Fine Screening
  • Ore Sorting
  • Gravity – continuous & batch
    • InLine Pressure Jig
    • Centrifugal Concentrators
  • Coarse Flotation
new flowsheet with gangue rejection
New flowsheet with gangue rejection
  • Recovery increased by maximising gravity recovery, finer grind, increased head grade to process plant.
benefits of new process for site
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
ceec linked in discussions
CEEC Linked In Discussions
  • Ore sorting
  • Microwave technology
  • Blasting techniques
  • Comminution research
  • Conference blogs
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