The traditional grinding medium consisted of silica-alumina-zirconium beads that, in those days, cost about US $ 25 per kilogram ( " kg " ) and lasted for only a few hundred hours.
12.
This work included using glass beads ( about US $ 4 / kg ) and screened river sand ( about US $ 0.10 / kg ) before it was found that the rounded beads produced by granulating reverberatory furnace slag from the Mount Isa copper smelter constituted an ideal grinding medium.
13.
MIM investigated various existing fine grinding technologies ( such as ball mills and tower mills ) but found them to be uneconomic in the MIM application and also that the high consumption rate of the steel grinding medium resulted in iron contamination of the mineral surfaces, making them less susceptible to flotation recovery.
14.
Design parameters include type of mill, milling container, milling speed, milling time, type, size, and size distribution of the grinding medium, ball-to-powder weight ratio, extent of filling the vial, milling atmosphere, process control agent, temperature of milling, and the reactivity of the species.
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