In the non-ferrous metallurgy factory, whether it is in the process of pyrometallurgy and hydrometallurgy, often need to add a certain amount of solid materials (such as ore, flux, coke) and intermediate solid product (such as sintering block, sand, slag, ash, leaching slag, etc.). Due to the different characteristics of the smelting process, also have different requirements for material particle size in each process. The operation that bulk of solid material broken into a small piece of material, usually referred to as crushing; And the operation that make the small pieces of material for furthrt grinding, is called grinding or milling.
According to the particle size of product, the crushing stage is divided into coarse crushing, medium crushing and fine crushing. Grinding stage is divided into coarse grinding and fine grinding. Different stages need to use different equipment, because the certain equipment only can do the high-efficiently work under appropriate particle size range. The actual production of crushing and grinding sections required, should be determined according to the ore properties and the required grinding particle size of final product.
Grinding operation has two types: dry method and wet method. When using a dry grinding, the water content of materials must conform to a certain limit. The high moisture materials should through dry processing or flue gas during grinding process simultaneously heat drying. When using a wet grinding, the material should be added a certain amount of water. In order to control the granularity of crushing and grinding product, and separating out the materials that meet the requirements of granularity as early as possible to reduce the mass crushing, and crushing and grinding equipment can work more effectively, the crusher is often cooperated with screening machine, also grinding machine is cooperated with classifier. Various forms of cooperation between them has formed all kinds of crushing and grinding process.