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Gold/Mining/Energy : International Precious Metals (IPMCF) -- Ignore unavailable to you. Want to Upgrade?

To: E. Charters who wrote (24986)	11/8/1997 4:39:00 PM
From: E. Charters	Read Replies (1) \| Respond to of 35569

Bond's Third Theory "In crushing, the total work useful in breakage that has been applied to a stated weight of homogeneous broken material is inversely proportioned to the square root of the diameter of the product particles." ----------------------------------- This is comparable to Rittinger's law that the work to break fine particles is proportional to the surface area created by the breakage. ------------------------------------ What this means is that as the diameter of the product is halved, its area doubles. So it take twice the energy to half the size of the product as it did to get to that product size from twice its size. This is a squared relationship. (This makes it tough to get down to micron sizes that IPM alleges the Pt particles must be locked up in. And without getting down to that size which is far, far smaller than 400 mesh... you won't get at the platinum that is alleged to be there. A nano-cluster of metal is a fraction of a micron, perhaps 2240 times smaller than 400 mesh. ) This makes sense as the breakage energy must be as the surface it breaks. Obviously a large surface would take a large energy component to create. --------------------------------------------------------------------