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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Coalition for Eco-Efficient Comminution

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Coalition for eco efficient comminution
VisionTo accelerate implementation of eco-efficient comminution strategies through promotion of research, data and industry benefits


Coalition for eco efficient comminution

PatronOwen Hegarty G-Resources Group

Board

Chair Elizabeth Lewis-Gray Gekko Systems

DirectorProf Tim Napier-Munn JKMRC

DirectorDr Wayne Stange AMIRA

DirectorDr Mike Daniel CMD Consulting

DirectorDr Zeljka PokrajcicWorley Parsons



Coalition for eco efficient comminution

30 – 40% total mine

4 – 9% Australia’s electricity consumption

Comminution Energy Consumption

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


Coalition for eco efficient comminution

Comminution Energy Consumption

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


Typical site comminution energy footprint
Typical site comminution energy footprint

Source Le Nause, Temos 1992


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


Coalition for eco efficient comminution

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


Coalition for eco efficient comminution

The most efficient way to break rock, is not to break rock at all”

Dr Rob Morrison, JKMRC


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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