Research on the Fractal Model of Size Distribution of Crushed Waste Printed Circuit Boards
DUAN Chen-long
ZHAO Yue-min
HE Ya-qun
HE Jing-feng
WEN Bao-feng
Abstract：The surface topography of crushed particles of waste printed circuit boards (WPCB) manifests self-similarity, which shows the fractal characteristics. A fractal model of size distri-bution of particles of WPCB was proposed. The eighteen curves of cumulative weight percent-age undersize of WPCB under different experimental conditions were fitted by the Origin 7.0 software. The correlation coefficient between the fits values and the factual values was closed to 1, and E of residual value is small, which shows that the fractal dimension D is an appropri-ate parameter indicating the fragmentation degree of WPCB. The Design Expert 6.0.8 soft-ware was used to establish a quadratic model between the fractal dimension D and the operating variables. The standard deviation is 0.022706. The predicted value based on the quadratic model is close to the actual value. All assessment indicators of residual, leverage, student re-sidual, cook's distance and outlier reached the required standard, which provide a credible foundation for effective wet crushing of WPCB.
Keywords：waste printed circuit boardswet impact crushingfractalsize distributioncumu-lative weight percentage undersize
Publication Date：2009-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：5( 357-361 )