Abstract：Base on the basic principles of particle discrete element method, A two dimensional DEM emulator named SieveDEM was developed by VC++.NET.The emulator is consisted with a feed hopper, a screen and a product baffle e.g.Three classes, which are CParticle class, CHopper class and CScreen class, were respectively designed to describe feed material, feed hopper and screen.By applying the common spring-dashpot-slide contact model and the "window method", the mathematical model of particle movement on the screen plate is built and the problem of contact search is resolved.Then, the whole screen process including feeding process can be dynamically simulated.Almost all the screening working parameters including feed physical characters, screen structure and working parameters can be artificially setup through filling corresponding dialog.In this program, progress rate of calculation can on-line show, calculation result can be saved for analyzing or progressively calculating.It also can be orderly or retrogressively demonstrated through cartoon which projecting speed can also be controlled.Statistical results can investigated through diagrams which can be artificially zoomed and picked-up.The simulation results gained through this program were extensively verified via experimental screen test, pilot-scale screen and industrial screen test.It not only provides a powerful tool for extensively cognitions of screening process, but also presents promising foreground of DEM in mineral processing domain.

Keyword：discrete element method;digital simulation;screen process;