Screening is an important link in the sand washing aggregates. The screening efficiency refers to the ratio of the actual screening product to the mass of the material that is lower than the screen hole in the feed. The screening efficiency directly affects the dewatering screen capacity. This article shares 5 ways to improve screening efficiency.
The large circular vibrating screen increases the vibration force and amplitude increases the impact stress and shear stress of the sieve plate on the material, overcomes the adhesion force between the ore particles, reduces the clogging of the screen surface, and makes the sieve material finish loose, stratified and permeable quickly. Owing to the improvement of sieve operating conditions, the screening efficiency of sand washing aggregates is improved accordingly.
The practice has proved that reducing the amount of material on the unit screen can improve screening efficiency. When the actual amount of material on the screen is approximately 80% of the capacity of the screen, the screening efficiency of the screen is the highest. When using a sieve as a grading device, because there are many levels of fine particles, it is necessary to ensure that there is enough screening area, and the screen surface should be appropriately lengthened to make the ratio of length to width of the screen surface above 2:1, which will help improve the screening efficiency and the dewatering screen capacity of sand washing aggregates.
Adopt a reasonable inclination angle to control the flow speed of material on the sieve surface. Generally speaking, the inclination angle is large, the material movement speed on the screen surface is fast, the production capacity is plentiful, but the efficiency is low. If you want to improve the screening efficiency and dewatering screen capacity of sand washing aggregates, the moving speed of the material on the screen surface is generally controlled below 0.6m/s, and the inclination angle of the screen surface should be kept at about 15°.
The screening process progresses. The thickness of the material on the screen surface gradually becomes thinner from the feeding end to the discharge end, resulting in an unreasonable feeding phenomenon that the utilization rate of the screen surface is first tightened and then loosened. For this reason, a broken line shape with different inclination angles can be utilized. The screen surface is utilized to control the different moving speeds of the materials in each section of the screen surface, forming a slope-like forward flow pattern of the ore stream, thereby increasing the chance of the difficult-to-screen particles at the discharge end.
In ordinary single layer sieve feed,” difficult sieve particles “and” blocking particles “(larger than sieve hole particles) almost all movement from the feed end to the discharge end, thus affecting the stratification and sieve of medium and fine particles. The multi-layer sieve with increasing and decreasing inclination of the sieve surface from the lower layer to the upper layer is adopted, that is, the sieve surface with different inclination angle and sieve hole for different particle size materials. In the upper layer, middle layer, and lower layer sieve surface, the material is loose, stratified, pre-screening, and fine-grained screening, which can overcome the blockage of the sieve hole and improve screening efficiency and screen capacity of sand washing aggregates.
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