First, the impact of the nature of the raw materials
1. Moisture content
Experiments have shown that sometimes the addition of surface active substances to aqueous materials can improve the activity and dispersibility of materials, improve the screening conditions, and improve the efficiency of the sieve by using sieve surfaces made of materials that cannot be wetted by water. .
2, the amount of mud
The soil is easy to agglomerate during the screening process, and it is easy to block the sieve holes. Clay materials and viscous materials can only be screened with larger sieve openings in some special cases. When screening the rosary ore, special measures must be taken, namely wet screening. Wet sieving is like spraying water on the material moving along the screen surface. Pre-desilting before sieving, drying the sieving raw materials, and using the electric heating screen to superimpose the supermarket and the sticky ore can get good results.
3, particle size characteristics
The particle size characteristics affecting the sieving process mainly refer to the content of various granule materials in the raw materials which have a specific meaning for the sieving process. When the difficult sieve particles and the barrier particles contained in the raw material are relatively large relative to other particle fractions, it is advantageous for the screening process. The particle size characteristics that affect the sieving process also include the shape of the granules. For particles with similar three-dimensional dimensions, such as spheres, polyhedrons, etc., screening is easier; for particles with large differences in size such as flakes, strips, and weird bodies, screening is performed under otherwise identical conditions. It is more difficult.
4, density characteristics
When all the particles in the material are of the same density, there is generally no effect on the screening. However, when the density of coarse and fine particles in the material is poor, the situation is not the same. If the coarse particle density is small and the fine particle density is large, it is easy to be sieved. On the contrary, the coarse grain density is large and the fine particle density is small, such as coal containing more coarse-grained vermiculite, and screening is relatively difficult.
Second, the impact of sieve performance
1. Screen movement form
The form of the screen surface movement is related to the looseness of the material layer on the screen and the speed, direction and frequency of the movement of the fine material relative to the screen surface, so the layered and through-screening process has an influence. In the vibrating screen, the moving form of the screen surface has several kinds of circular vibration, linear vibration and elliptical vibration. Among them, the elliptical vibration motion form has a higher screening quality.
2, sieve surface structure parameters
A. Screen width and length
Under normal circumstances, the width of the sieve determines the processing capacity of the sieve. The wider the sieve surface, the greater the processing capacity. The length of the sieve determines the screening efficiency of the sieve. The longer the sieve surface, the higher the efficiency. After the length of the sieve surface reaches a certain size, the screening efficiency is increased little or even no longer. At this time, increasing the length of the sieve surface only increases the volume and quality of the sieve.
B. Screen angle
The inclination angle of the sieve surface has an influence on the screening strength, the inclination angle is large, the granularity of the falling is reduced, the inclination angle is small, and the granularity of the falling is increased. In order to facilitate the exclusion of the screen, the screen surface is sometimes installed obliquely. When the angle of inclination is large, the speed of the material layer moving forward on the screen surface is fast, the productivity is large, but the time for the material to stay on the screen surface is shortened, the particle permeable opportunity is reduced, and the screening efficiency is lowered.
C. Size, shape and opening ratio of the mesh
The larger the sieve opening, the higher the processing capacity per unit sieve area and the higher the screening efficiency. In general, the larger the mesh size, the higher the mesh opening ratio. When the mesh size is fixed, the larger the opening ratio is, the more favorable the screening is, but the opening ratio is often limited by the strength of the screen surface and the service life.
3. Influence of operating conditions
For a certain sieve and screening raw materials, the operating conditions mainly refer to the amount of feedstock and the manner of feeding. The feeding should be continuous and uniform. In addition, timely cleaning and maintenance of the screen surface is also beneficial for the screening operation.
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