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MEI Online: Plant Operation News: Australasia: May 13th 2011


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:: Transforming Magnetite Circuits with the IsaMillTM

IsaMillsTM have been established for over 15 years in base metal grinding circuits, transforming the operations with their energy efficient grinding action. The technology is now being adopted by the iron ore industry, with the first IsaMillTM being planned for commissioning in early 2011 at Xstrata Copper's Ernest Henry Mine's Magnetite Project in Queensland.

Xstrata Technology will be providing an IsaMillTM package for the project, that will include a M10,000 IsaMillTM, powered with a 3MW motor, feed and discharge pumpboxes, surrounding steelwork, media collection hopper and the IsaChargerTM media addition system.

Like many magnetite operations, the magnetite needs to be ground down to ~40μm to enable a premium concentrate to be produced. This is an ideal size range for the IsaMillTM. The magnetite flowsheet treats tailings from the existing copper flotation circuit. Magnetic separators produce a rougher concentrate for regrinding in the IsaMillTM, followed by a second stage of magnetic separators. The concentrator is planned to produce approximately 1.2 million tonnes of high quality magnetite concentrate per annum.

Katie Barns, IsaMillTM Strategy Manager, said that the IsaMill was selected because of its high power efficiency and its proven performance in other grinding applications, and it promises to play a major part in future magnetite circuits because of these advantages.

The circuit will include the new IsaChargerTM, a simple feed system to top up the grinding media to the IsaMillTM, ensuring steady power draw and optimal grinding conditions.




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