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IsaMill
The IsaMillTM is an energy-efficient mineral industry grinding mill that was jointly developed in the 1990s by Mount Isa Mines Limited ("MIM", a subsidiary of MIM Holdings Limited and now part of the Glencore Xstrata group of companies) and Netzsch Feinmahltechnik ("Netzsch"), a German manufacturer of bead mills.〔C R Fountain, ‘Isasmelt and IsaMills—models of successful R&D,’ in: ''Young Leaders’ Conference, Kalgoorlie, Western Australia, 19–21 March 2002'' (The Australasian Institute of Mining and Metallurgy: Melbourne, 2002), 1–12.〕 The IsaMill is primarily known for its ultrafine grinding applications in the mining industry, but is also being used as a more efficient means of coarse grinding.〔G S Anderson and B D Burford, "IsaMill—the crossover from ultrafine to coarse grinding," in: ''Metallurgical Plant Design and Operating Strategies (MetPlant 2006), 18–19 September 2006, Perth, Western Australia'' (The Australasian Institute of Mining and Metallurgy: Melbourne, 2006), 10–32.〕〔M Larson, G Anderson, K Barns and V Villadolid, ("IsaMill—1:1 direct scaleup from ultrafine to coarse grinding," ) in: ''Comminution 12, 17–20 April 2012, Cape Town, South Africa'' (Minerals Engineering International). Accessed 24 May 2013.〕 By the end of 2008, over 70% of the IsaMill’s installed capacity was for conventional regrinding or mainstream grinding applications (as opposed to ultrafine grinding), with target product sizes ranging from 25 to 60 µm.〔J Pease, ("Case Study – Coarse IsaMilling at McArthur River," ) Presentation at: ''Crushing and Grinding, Brisbane, September 2007''. Accessed 24 May 2013.〕
==Introduction==
While most grinding in the mineral industry is achieved using devices containing a steel grinding medium, the IsaMill uses inert grinding media such as silica sand, waste smelter slag or ceramic balls.〔 The use of steel grinding media can cause problems in the subsequent flotation processes that are used to separate the various minerals in an ore, because the iron from the grinding medium can affect the surface properties of the minerals and reduce the effectiveness of the separation.〔N W Johnson, M Gao, M F Young and B Cronin, "Application of the ISAMILL (a horizontal stirred mill) to the lead–zinc concentrator (Mount Isa Mines Limited) and the mining cycle," in: ''AusIMM ’98 – The Mining Cycle, Mount Isa, 19–23 April 1998'' (The Australasian Institute of Mining and Metallurgy: Melbourne, 1998), 291–297.〕 The IsaMill avoids these contamination-related performance issues through the use of an inert grinding medium.
First used in the Mount Isa lead–zinc concentrator in 1994, by May 2013 there were 121 IsaMill installations listed in 20 countries, where they were used by 40 different companies.〔(IsaMillTM installation list. ) Accessed 25 May 2013.〕
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