The so-called sieving efficiency refers to the weight ratio of the actually obtained under-slurry product to the material contained in the sieving material having a particle size smaller than the mesh size. Factors affecting screening efficiency: First, the nature of the material (1) Particles whose particle size characteristics are smaller than 3/4 mesh size are called “easy sieve grainsâ€; those smaller than mesh size but larger than 3/4 mesh size are called “difficult sieve grainsâ€, and the particle size is 1 to 1.5 times. The size of the mesh size is called "obstruction grain". When the fine content of the raw material is small, and the sieve material itself is too coarse, and the particle size greatly exceeds the size of the mesh hole, an auxiliary sieve having a larger mesh size may be used, and the product on the sieve is discharged to a coarser level, and then sieved. Contains a large number of finer grades of finer materials to increase screening efficiency and extend screen life. (2) The water content of the material and the surface moisture of the material containing the mud material enable the fine particles to bond to each other and adhere to the large particles, and the viscous material also blocks the sieve holes, so when the water content of the material is high, When the screening efficiency is seriously affected, the method of appropriately increasing the meshing hole may be considered to improve the screening efficiency. (3) If the particle shape of the material is circular, it is easy to pass through the square hole and the hole, and the broken product is mostly polygonal. It is easy to pass through the square hole and the hole through the square hole, strip, plate, The sheet material is difficult to penetrate through the square hole and the hole, but it is easy to pass through the rectangular hole. Second, the type of sieve surface (1) There are usually three kinds of sieve working faces: steel bars, steel wires and steel plate punching. Their influence on the screening efficiency is mainly related to their effective area. The larger the effective area, the more the screen surface and the mesh hole occupy. The ore particles are easier to pass through the sieve holes, and the screening efficiency is high, but the service life is short. The effective area of ​​the steel wire mesh surface is the largest, but the price is the most expensive, but when fine screening is required, the steel wire mesh is used. (2) Screen shape The sieve mask of the rectangular sieve hole has a large effective area and a high production capacity, which can reduce the clogging phenomenon of the screen surface. (3) Screen size (4) The movement state of the sieve The screening efficiency of various sieves is roughly as follows: Sieve type fixed strip sieve drum sieve shake sieve shaker Screening efficiency% 50-60 60 70-80 90 or more (5) The length and width of the sieve For a given material, the productivity depends mainly on the width of the screen surface, and the screening efficiency depends mainly on the length of the screen surface. Generally, the ratio of the width to the length of the sieve is 1:2.5 to 1:3. Third, the operating conditions (1) Feeding should be uniform and continuous (2) Feeding amount The amount of feedstock increases, the production capacity increases, but the screening efficiency will gradually decrease; the above categories are the factors affecting the screening efficiency and the corresponding measures to be taken.
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