Patent ID: 6520837
Filing Date: 2003-02-18
Classification: B02C,Y10S

Abstract:
A method for ultrafine processing of solid particulate material to particle sizes in the range of nanometers, comprising the steps of:a. providing a grinding chamber having walls containing loose grinding media; b. generating a cooled atmosphere in said grinding chamber; c. feeding said material to be processed and an additive into said grinding chamber, said additive is solidified and below its melting or sublimation temperature and behaves chemically inert with regard to the material to be processed and which can evaporate and/or is volatile at ambient pressure at temperatures below 50Â° C.; d. inducing motion of said grinding media relative to adjacent grinding media and to said walls of the grinding chamber until said material is ground to the desired particle size in the range of nanometers; and e. removing thereafter said additive from the processed material by evaporation.