In addition to considering the above effects, the following basic principles should be observed: (1) After determining the screening area, the width of the screen surface should be at least 2.5 to 3 times the size of the largest block material, so as to prevent the sieve from being jammed by a large block. (2) For the sieve to be in good working condition, the ratio of the length to the width of the sieve should be selected within the range of 2 to 3. (3) The material and structure of the reasonable screen surface should be selected to suit the working conditions. (4) Determination of the size of the sieve hole. For the fine sieve and the curved sieve, the linear sieve is used for fine sieve screening, and the sieve size is 2 to 2.2 times of the separation granularity. The maximum is not more than 3 times; for the vibrating screen, for the medium-grain material screening, the mesh size is 1.2 times the separation particle size; when used for the coarse material screening, the mesh size is 1.05 of the separation particle size; Probability sieve, the size of the sieve hole is generally 2 to 2.5 times the actual separation particle size. (5) Determine whether a double or multi-layer screen is used. When the size range of the sieved material is wide, when the double-layer sieve is used as the single-layer sieve, the treatment capacity of the screening machine can be improved, and the lower sieve can be protected, and the service life of the lower sieve can be extended. The selection of the size of the upper sieve mesh of the double-layer sieve should generally be determined according to the grain size characteristics of the ore. Consider the sieve amount of the upper sieve, which is equivalent to the particle size of 55-65% of the original feed amount. size. Note that when the content of the sieve in the raw material exceeds 50%, the number of difficult sieves is large, and the viscosity of the material is high and the moisture is high, the double-layer sieve should be avoided as a single-layer sieve. (6) Determine the effective working area of ​​the sieve. The screening area calculated according to the production process requirements is the effective area of ​​the sieve, and the specification of the sieve is the nominal area of ​​the sieve. For the sieve of the medium-size material screening, the effective screening area should be 0.8 to 0.85 of the nominal area of ​​the sieve. Times. Of course, this is closely related to the opening ratio of the sieve holes on the sieve surface. hair (7) For materials above 200mm, heavy vibrating screens are used; for materials above 10mm, round moving screens are often used; linear vibrating screens and high-frequency vibrating screens are used for de-mudging, dewatering and grading. (8) When the conditions permit, the seat screen should be preferred to facilitate maintenance and maintenance. When the hanging sieve must be selected, the lifting height should be minimized to reduce the swinging amplitude of the vibrating screen and facilitate the production operation.
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The main factors that should be considered in selecting the type of screening machine are: the characteristics of the sieving material (the content of the material under the sieve, the content of the granules, the moisture and clay content of the material, the shape of the material, the specific gravity of the material, etc.); The structure of the screening machine (screen area, number of mesh layers, mesh size and shape, mesh area ratio, screen movement mode, amplitude and frequency, etc.); requirements of beneficiation process (processing capacity, screening efficiency, screening) Method, sifter tilt angle, etc.