What Is Vacuum Drum Filter?

Rotray Drum Screen August 27, 2024 Vacuum Drum Filter

A vacuum drum filter is an industrial filtration device designed for continuous solid-liquid separation. The system features a large, rotating drum that is partially submerged in a slurry, which is a mixture of solids and liquids. The drum's surface is covered with a filter medium, such as a cloth or mesh, and is connected to a vacuum system inside the drum.

Here’s how it works in more detail:

Rotating Drum: The drum slowly rotates within the slurry, typically at a low speed to allow sufficient time for filtration.
Vacuum Application: As the drum rotates, a vacuum is applied inside the drum, creating a pressure differential across the filter medium. This vacuum draws the liquid component of the slurry (filtrate) through the filter medium, leaving the solid particles (filter cake) on the drum's surface.
Filtration Zones:
- Submersion Zone: This is where the drum is submerged in the slurry, and filtration begins as the vacuum pulls the liquid through the filter medium.
- Drying Zone: As the drum continues to rotate out of the slurry, the vacuum is maintained, which helps to dewater the filter cake by removing any remaining liquid.
- Cake Discharge Zone: Once the drum reaches this zone, the vacuum is released, and the filter cake is typically removed using a scraper, belt, or knife.
Filtrate Collection: The liquid that passes through the filter medium (filtrate) is collected in a vacuum receiver and can be processed further or discarded, depending on the application.
Filter Cake Removal: The solid cake that forms on the drum’s surface is scraped off and collected for further processing or disposal.