Abstract：For waste printed circuit boards having the characteristics of high hardness and toughness, an experiment of preparing ultrafine particles of waste printed circuit boards thickly broked was conducted by classify-impact mill. The power consumption was evaluated using Rittinger's area hypothesis according to the experimental data. The results show that the waste printed circuit boards are broken and liberated effectively by classify-impact mill. The metal and nonmetal particles are totally separated while the dimension is less than 0.6 mm. The size distribution during waste printed circuit boards crushed by classify-impact mill can be described by Rosin-Rammler distribution function. With the decrease of the particle size, the specific surface power consumption increases. When the average particle size is less than 0.312 mm, the specific surface power consumption increases greatly.

keywords: waste printed circuit board; classify-impact mill; Rosin Rammler distribution function; power consumption