With the high speed development of metallurgical industry, in order to make use of fine iron ore, in the process of mineral processing, the need for fine particle screening and grading equipment is becoming more and more urgent. In the case of magnetite, the commonly used hydraulic classification equipment will lead to fine products mixed with gangue intergrowth (middling) into the magnetite concentrate, and the quality of concentrate decreased. In addition, coarse product will have have fine iron minerals dissociation into classifier sand return and return regrinding caused by crushing, mud loss increased so that the grinding mill processing capabilities to reduce concentrate filtration velocity slows down. In the flotation plant, tailings coarse middlings usually discharged into the roughing, one reason is to reduce the rate of recovery. Therefore, the improvement of classification method will help to reduce the grinding of minerals, improve the mill output, improve product quality and recovery rate. Because screening is in strict accordance with the particle size classification, appearing successively in recent years various types of fine screening equipment, it to improve the grade of iron concentrate and reduce the content of silica in concentrate, plays an important role. In some non-ferrous metal ore (such as copper, lead, zinc, tungsten, tin ore grinding ore ring can also serve to prevent crushing improve flotation effect; and thus have the attention of domestic and foreign mineral processing plant, its application is more and more widely. Fine is a fine screening with vibration device (sorting) equipment.
At present, there are two kinds of striking devices. One is mechanical beating device, or the use of pneumatic piston mechanism; the other is the screen which has a motor installed on the screen and run by the vibration of the motor movements. These two types of shock isolation device is by sudden force of the screening surface induces high frequency vibration of the walls, thereby eliminating the sieve of jam. The mechanical rapping device of fine screen, simple structure, it can be used in large-scale magnetite concentrator, what is recommended is a root shaft provided with several hammers. For the present ,this kind of screen is applied in mineral processing plant in china.