autogenous mill 6400 353 18 ball mill 2600 126 21 regrind mill 740 39 19 tower mill 1000 12 42 isamill™ 3000 10 300 product size distribution in open circuit operation, the isamill™ is able to produce a sharp product size distribution. typically the ratio of the p98 to the p80 is around 2.5.
regrind mills: challenges of scaleup michael larson1,greg - isamill. the standard bond mill test applies for coarser ball milling, but is not appropriate performance of full scale regrind mills against their original design estimate.
in a recent application of the isamill, the existing regrind mill before gold leaching was consuming 10 t/day of steel balls. this reduced pulp eh ball mill isamill. the particle. but for a 9 micron particle this rim is sufficient for the mineral to disintegrate (figure 2).
of the isamill™ is one tenth of the equivalent ball or tower mill. the high intensity means short residence times, preventing overgrinding and giving a sharp product size distribution. » isamill™ advantages 7 horizontal design plug-˚ow design. this avoids short circuiting and makes the mill far less sensitive to process disturbances.
the large scale of the isamill™ makes that efficiency available to mainstream grinding. the high energy efficiency of stirred mills compared to ball mills is well understood. the use of tower mills as an energy efficient alternative to secondary and regrind ball milling became a common inclusion in the latter part of the previous century.
this high intensity grinding technology (>300kw/m 3) requires a much smaller footprint than conventional grinding technology – the grinding volume of the isamill™ is about one tenth the equivalent ball or tower mill.