Generally speaking, in fertilizer plant, the bulk urea conveying distance is more than 1000 m. Long distance conveying caused the urea dust significantly increase. In order to reduce the quantity of urea dust, screening equipment are selected to separate urea particle in the transportation of bulk urea. Therefore, during the in the actual production process, the working principle, structure and performance of screening equipment are very important. The outstanding advantages of vibratory separator make it an important equipment for chemical fertilizer screening.

The working principle of vibrating screen
The vibratory separator generates centrifugal force by rotating the eccentric block through the vibrating motor, and provides the exciting force to make the screen body vibrate to screening materials. In the screening process, fine particles close to the size of the mesh are easy to get stuck in the mesh. Meanwhile, urea dust is easy to absorb moisture and adhere to and block the mesh, which affects the screening efficiency. The vibration motor is easy to adjust, but the vibration force will reduce the screening efficiency, and the vibration force will damage the equipment body. It requires the operator to clean the screen frequently and the labor intensity is relatively large.
Vibratory separator structure and operation
The vibratory separator is mainly composed of the screen cover, screen frame, motor (vibration source), rubber spring, base, etc. The screen cover is composed of an inlet and an oblique cone, the lower end of which is connected to the screen frame. The screen cover and screen frame are connected by clamps, and there is a sealing pad between the screen cover and screen frame. The screen frame is rolled with a steel plate. The upper and lower ends of the screen frame are provided with a - receiving ring, and the lower end has an internal flange ring, which is used to fix the screen and the screen cleaning system. In the screening process, the vibratory separator runs stably. Within one overhaul period, the screen body and rotating motor have no faults. The active belt of the rotary motor was broken once. 3 times broken the soft connection of the feed port. After that, wear-resistant materials were added to the inner side of the soft connection of the inlet, which solved the problem of frequent damage of the soft connection of the inlet, the sieving rate can be 12.21％一 20.71％.
Urea dust is easy to absorb moisture and adhesion, the selection of vibratory separator should try to choose non-sticky, non-blocking screen products. The vibratory separator is powered by the rotating motor, which makes the screen body carry out reciprocating rotating movement and has little impact on the equipment body. Moreover, the screen has its cleaning system, which improves the screening efficiency and reduces the labor intensity of the operators. The sieving rate per unit area of the vibratory separator is significantly higher than that of the vibrating screen, which has a small impact on the equipment, low failure rate and low labor intensity of the operators, but the initial investment is larger.