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MEI Online: Comminution: Latest News: June 25th 2018


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:: 2018 CEEC Medal Win to Nippon Eirich and Karara Mine Circuit Improvement Collaboration


An outstanding collaboration between Karara Mining Limited and Nippon Eirich to implement grinding circuit process improvements at Karara Mine has been awarded the 2018 CEEC Medal.

The 2018 CEEC Medal win goes to a team that shared their work at the 2017 MetPlant Conference in Australia: ‘Fine grinding circuit process improvement at the Karara Mine concentrator’, written by Sam Palaniandy, Matthew Spagnolo, Rinto Napitupulu Halomoan, Huiwen Zhouand Hidemasa Ishikawa.

CEEC Medal Evaluation Committee Chair Dr Zeljka Pokrajcic said the prestigious award recognised outstanding published research and fieldwork on strategies for energy-efficient comminution. The winners documented a collaboration between Karara Mining Limited and METS company Nippon Eirich, sharing a well planned and well written operational improvement.

Site staff at Karara Mine, located in the mid-west region of Western Australia, faced the challenge of needing to exceed plant throughput and tackle increases in ore hardness. The authors documented how they converted the TowerMills to bottom feed for improved grinding efficiency, allowing increased throughput at high ore hardness.

“The team’s systematic and methodical approach to identifying and implementing circuit changes around the TowerMill and hydrocyclone installation both solved the site’s challenge and achieved significant energy and productivity gains, with up to 50 percent reduction in specific energy of the fine grinding circuit,” Dr Pokrajcic said.

“The authors showed how operational improvements in part of the circuit can reduce overall comminution energy use. They also demonstrated that big improvements can be successfully incorporated into existing mines with live production needs.”

The CEEC Board and Chief Executive Alison Keogh congratulate the medal winners for publishing an excellent and practical operational paper, which helps address pressing industry challenges.

“We also commend Karara Mining for its leadership in supporting the authors to share their learnings with the global mining industry. Karara Mining’s willingness to share how it solved site problems through this collaboration with Nippon Eirich shows their joint commitment to our industry’s improvement, innovation and partnerships,” Ms Keogh said.

Although no CEEC Medal was awarded in the Technical Research category, the overall standard of global entries was high. The broad range of research topics nominated included advanced simulation and modelling techniques, novel approaches to microwave pre-treatment of plant feed, and use of different types and shapes of grinding media.

In addition to awarding the CEEC Medal for Operations, the committee bestowed high commendations on the following exceptional publications:

* ‘Introducing variable electricity cost into the comminution energy curves’, by Grant R Ballantyne. This paper was presented at Comminution’18 in Cape Town, South Africa.

The committee said the paper was “an important new contribution to industry, presenting new global energy costs maps and energy curves tools to help industry consider energy efficiency benefits”.

* ‘Ball mill classification system optimization through functional performance modelling’, by Robert McIvor, Kyle Bartholomew, Omar Arafat and Jim Finch. This paper was published in SME’s Mining Engineering magazine.

The committee noted this important US contribution to comminution efficiency, which details a step-by-step approach to optimise ball mill circuits and shares the benefits of different equipment selections.

* ‘Cave fragmentation in a cave-to-mill context at the New Afton mine Part II: Implications to mill performance, mining technology’, by Stefan Nadolski, Christopher O‘Hara, Bern Klein, Davide Elmo and Craig J. R. Hart.

"Underground mining approaches can reduce footprint, not only with less surface expression but also by focusing on drawing out only the material needed. The novel approach outlined in this paper helps industry identify and implement energy, cost and value benefits using a new cave-to-mill optimisation approach. In the future, we anticipate industry will take up more underground methods, including block cave," the committee said.

* ‘Shifting the comminution workload from secondary to regrind stage: An energy efficient approach’, by Samayamutthirian Palaniandy, Hidemasa Ishikawa and Mohsen Yahyaei, presented and published at Procemin Geomet 2017, Santiago, Chile.

This collaborative work demonstrates the benefits of coarsening SAG mill circuit product size then bulk gangue rejection using flotation. The committee noted this alternative approach to processing low-grade, competent and finely disseminated orebodies offered significant savings to operational expenditure.

Ms Keogh congratulated the award winners and the highly commended authors for their part in helping global mining companies find the best solutions for improving energy efficiency, reducing costs and enhancing productivity.

“By sharing these advances across our global network CEEC is proud to be helping operators, researchers and equipment suppliers to stay at the cutting edge of comminution and minerals processing, and reduce footprint,” she said.

Nominations for the 2019 CEEC Medal open on 15 October 2018. For details on how to nominate, visit www.ceecthefuture.org/ceec-medal




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