4 Factors Affecting The Screening Efficiency Of Trommel Screen

Date: Nov. 10, 2020

The trommel screen is beneficiation equipment, usually used for beneficiation, and is also a piece of necessary screening equipment for screening river sand. The following factors have a great influence on the efficiency of the trommel screen. If we can accurately grasp these characteristics, we can greatly improve the screening efficiency of the drum screen.

drum screen

1. Water Content

The moisture content of the material is also called humidity or moisture. The external moisture attached to the surface of the material has a great influence on the screening of the material. The moisture in the material cracks and the moisture combined with the material does not affect the screening process. Generally, the external moisture is below 6%, which can be used for dry screening. If the external moisture exceeds 6%, the external moisture of the material can make the fine particles adhere to each other into a cluster and adhere to the large pieces. This viscous material will block the screen holes, making it difficult to screen.

drum screen

2. Mud Content

If the material contains an agglomerating mixture (such as clay.), even when the moisture content is low, screening may be difficult. Because the clay material will stick into agglomerates during the sieving, the fine mud will be mixed into the product on the sieve. Besides, clay can easily block the screen holes. Clay materials and viscous materials can only be sieved with a larger sieve surface under certain circumstances. When sieving viscous ores, special measures must be adopted, including wet screening (that is, along with the screen) Spray water on the moving materials, pre-desludging before the screening, and dry the screening materials. Using an electric heating screen to screen wet and viscous ores can get good results.

drum screen

3. Granularity Characteristics

Granularity characteristics mainly refer to the content of various granular materials in the raw materials that have specific significance for the screening process. When there are more difficult-to-sieving particles and hindered particles in the raw materials than other particle sizes, it is unfavorable for the screening process. The particle size characteristics that affect the screening process also include the shape of the particles. For particles with close three-dimensional dimensions, such as spheres, cubes, polyhedrons, it is easier to screen. For particles with large differences in three-dimensional sizes, such as flakes, elongated bodies, and weird bodies, it is more difficult to screen under the same other conditions.

drum screen

4. Density Characteristics

When all particles in the material have the same density, it generally does not affect the screening. But when there is a density difference between coarse and fine particles in the material, the situation is very different. If the density of coarse grains is small and the density of fine grains is high, sieving is easy, for example, fine sand mixed in is sieved from rice. This is because the obstructive effect of the coarse-grained layer is relatively small, while the penetrating and sieving effect of the fine-grained layer is relatively large. On the contrary, if the density of coarse grains is high and the density of fine grains is low, for example, coal containing more coarse-grained lumps, screening is relatively difficult.

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