equipment Fragmentation and grinding are usually carried out in stages, since in most cases the existing equipment cannot be crushed to the required fineness at one time. The specific selection of the number of crushing and grinding sections depends on the nature of the ore, the size of the raw materials, the fineness of the product and the type of equipment. Each time the material passes through a crusher or a grinding machine, it is called a crushing or grinding section. For each stage of crushing or grinding operations, the ratio of the particle size before and after the crushing of the material (ie the feed size to the product size) is defined as the crushing ratio or crushing ratio of the crushing or grinding operation of the section, which reflects the crusher or grinding. After the machine is pulverized, the particle size of the raw material (mine) is reduced. The product of the crushing or pulverizing operation ratio or the pulverization ratio of each stage is the total crushing ratio or the pulverizing ratio of the crushing or pulverizing process. Today's crushing and grinding methods are mainly mechanical crushing. Commonly used crushing equipment mainly includes jaw crusher , cone crusher , roller crusher, counterattack type and hammer crusher ; common grinding equipment mainly includes ball mill , rod mill, self-grinding machine , gravel mill, Raymond mill, vibratory mill, vertical mill, centrifugal self-grinding mill, hammer mill, turbine mill and other mechanical impact mills. The types, performance characteristics and applications of these devices are listed in Tables 1 and 2. In general, crushing is a dry process. However, the grinding process has both dry and wet processes, depending on the nature of the raw materials, the purpose of the product, and the purpose of the grinding operation. In crushing and main grinding operations, it is often necessary to provide screening or grading equipment to control the particle size distribution of the product and to improve the efficiency of the pulverizing operation. The sieving or grading operation does not constitute a separate crushing or grinding section, but rather constitutes a crushing or grinding section with the corresponding crusher or mill. Therefore, whether one crusher or mill is equipped with one or more classifiers is a crusher or grinding section. Cheap Kayak,Inflatable Canoe,Fishing Kayak With Pedals,Inflatable Fishing Kayak Ningbo Haishu Hongkang Outdoor Industry & Trade Co., Ltd , https://www.hktrollingmotors.com