Phelps Dodge has recently operated a commercial scale, super fine grinding circuit of copper concentrates for use in a medium-temperature pressure leaching process. Two 355 kW vertical stirred mills were installed in series, targeting a grind of 80 percent passing 7.5 mu m and 98 percent passing 15 mu m as outlined in Phelps Dodge's concentrate leaching patent portfolio. This paper details the operation and results of the test program at Bagdad, as well as some of the operating challenges encountered.
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