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Coalition for Eco-Efficient Comminution

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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  1. Coalition for Eco-Efficient Comminution

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

  3. 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

  4. CEEC Sponsors

  5. 30 – 40% total mine 4 – 9% Australia’s electricity consumption Comminution Energy Consumption Source: CSRP Eco-Efficient Liberation – Outcomes and Benefits 2003-2010

  6. Comminution Energy Consumption CO2 contributions for the stages of copper concentrate production, Source: Norgate and Haque, 2010

  7. Typical site comminution energy footprint Source Le Nause, Temos 1992

  8. 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

  9. Energy & grind size Selection of the coarsest possible grind size Source: Hukki RT, 1961

  10. Optimum liberation

  11. Coarser grind may improve recovery

  12. 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

  13. “The most efficient way to break rock, is not to break rock at all” Dr Rob Morrison, JKMRC

  14. 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

  15. Improving technologies • Fine crushing • VSI • HPGR • Fine Screening • Ore Sorting • Gravity – continuous & batch • InLine Pressure Jig • Centrifugal Concentrators • Coarse Flotation

  16. Castlemaine Goldfields plant

  17. New flowsheet with gangue rejection • Recovery increased by maximising gravity recovery, finer grind, increased head grade to process plant.

  18. 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

  19. CEEC Linked In discussion page

  20. CEEC Linked In Discussions • Ore sorting • Microwave technology • Blasting techniques • Comminution research • Conference blogs

  21. CEEC – Website Home Page

  22. CEEC – Key Papers

  23. CEEC Sponsors

  24. End

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