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MEI Online: Plant Operation News: Africa: May 24th 2011


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:: Another IsaMillTM for Lonmin

Lonmin has chosen IsaMillTM technology as part of its upgrade at its new Eastern Platinum Tailings Treatment Plant located at Marikana, South Africa. A M3000 High Flow IsaMillTM has been chosen for the fine grinding circuit in the plant which will treat tailings from both the EPL and EP-C Concentrators. This mill will be in addition to the other M3000 IsaMillTM operated by Lonmin, operating in the EP-C Concentrator, which was installed in 2002, treating fine platinum in a flotation cleaner tail stream.

Cedric Walstra, South African Manager Xstrata Technology SA, who has been working on the project, said the new Lonmin mill will be treating some extremely hard chromite bearing material containing PGM’s from a concentrator tailings stream. A series of classification stages in the new plant treating the concentrator tailings will deliver a coarse product to a ball mill circuit, followed by the IsaMillTM to liberate the locked PGM particles prior to a 3 stage flotation circuit. The IsaMillTM will be required to produce a grind size of 85 to 90% less than 75um.

Cedric said Xstrata Technology will also supply the new IsaChargerTM media addition system to add the ceramic grinding media to the mill via the feed pumpbox. This proprietary media system has been developed to handle a range of media types and sizes, and to charge media at both low rates during normal mill operation to maintain steady power draw, and at high rates to recover to full power after mill shutdowns.

The whole IsaMillTM package will be delivered to the Lonmin site in the middle of 2011, with engineers from Xstrata Technology to supervise installation and assist with commissioning.




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