Here is a paper I ran across on the web that I thought you guy's might be interested in. It discusses some advantages to using a ball mill as a reaction medium for various chemical reactions, inorganic and organic...
http://www.zoz.de/english/PDF-Dateien/40%20reactive%20dry-milling%20for%20enviro%20protection.pdf (http://www.zoz.de/english/PDF-Dateien/40%20reactive%20dry-milling%20for%20enviro%20protection.pdf)