What is the wet sieving process?

Wednesday April-09 2025  17:34:26

Wet sieving process is a sieving process assisted by a liquid (usually water or a solution containing a dispersant) to more effectively separate fine particles, sticky materials, or where liquid bound to particles needs to be removed. Its core principle is to use a combination of water flow flushing and vibrating screens to classify the mixture by particle size.

What is the main role of the liquid medium in the wet sieving process?

The material to be screened is mixed with a liquid to form a slurry, which is then passed through a vibrating screen. The main roles of the liquid medium are:

Dispersion: Helps disperse fine or sticky particles that are easy to agglomerate and improves separation efficiency.

Cleaning: The flowing liquid flushes the screen to prevent fine particles from clogging the mesh and keep the screen clean.

Medium role: The liquid acts as a carrier to help fine particles pass through the screen more smoothly.

Basic principles of wet sieving process

Liquid medium role: Water or other liquids can reduce the adhesion between particles, prevent fine particles from agglomerating, and carry fine particles through the screen.

Mechanical vibration: The screen promotes particle dispersion under high-frequency vibration and improves screening efficiency, especially for fine particles (such as materials <75μm).

Comparison between wet sieving process and dry sieving process

Features	wet sieving process	dry sieving process
Image
Applicable particle size	finer (up to several microns)	usually >75μm
Processing capacity	lower (due to water medium limitation)	higher
Environmental protection	no dust, but wastewater	dust needs to be controlled

What is the wet sieving process?

The process of wet sieving process mainly includes three parts: First, the material is mixed with water into slurry, and a dispersant is added if necessary. Second, the slurry passes through the vibrating screen, and the water flow washes the fine particles through the screen, and the coarse particles remain on the screen. Finally, the screened material (slurry containing fine particles) needs to be precipitated, filtered or centrifuged to recover solids.

The selection of Wet sieving process needs to comprehensively consider the material properties, particle size requirements and subsequent processing costs, especially in fine powder and high purity applications.