Abstract:After a new copper-iron ore system was put into operation in Hubei Province, the particle size of crushing products is about 85% for - 15mm, and the overflow fineness of grinding classification is about 63%~65%, which is far behind the design value.Through the optimization and improvement of crushing and grinding process, the particle size of crushing products can reach 95% for -15mm, and that of grading overflow can reach more than 70% for - 200 mesh, which meets the design requirements and creates favorable conditions for separation.