Material moisture content on the impact of screening efficiency
The moisture content of materials, also known as the humidity or moisture. External moisture attached to the surface of the material particles have a significant impact on materials screening; moisture in the material cracks and moisture, combined with the material no effect on the screening process.
For example: the screening of some bituminous coal, such as water to reach 6%, screening process is actually difficult to carry out coal moisture is basically covering the surface; However, the pore lot of lignite moisture 45% The screening process is still normal. The material in the pores of the sieve screening the impact of the water is particularly prominent. Fine grade material than the surface area, external water is also the highest. External moisture of the material, make the fine particles bond with each other into groups, and attached in large blocks. This sticky material will screen larvae L blocked. In addition, attached to the screen wire on the water, under the action of surface tension, may form a water film to cover up the sieve.
All of these cases are hampered materials stratified according to the granularity of the screen surface, the fine particles difficult to remain in the product of the sieve through the sieve. The material contained in the water reaches a certain range, the screening efficiency is drastically reduced. This range depends on the nature of the materials and the sieve size. Material after the water over this range, the activity of the particles again, and gradually achieve the conditions of wet sieving contained in other words, when the material with water for screening. The specific impact of the water of a certain material screening process can only judge based on test results.