Patent ID: 7264185
Filing Date: 2007-09-04
Classification: B02C,B07B

Abstract:
1. A dry grinding method comprising: a grinding step of dry-grinding a material to be ground; a first classification step of classifying a ground product obtained through the grinding step, into fine powder having a relatively small average particle size and coarse powder having a relatively large average particle size; a second classification step of further classifying the coarse powder obtained through the first classification step, into fine powder having a relatively small average particle size and coarse powder having a relatively large average particle size; and a returning step of returning to the grinding step the coarse powder obtained through the second classification step, wherein the second classification step includes: a classification step of further classifying the resultant fine powder into ultrafine powder having a relatively small average particle size and fine powder having a relatively large average particle size; and a returning step of returning to the grinding step the ultrafine powder obtained through this classification step.