Rotary Vacuum Filter
This machine is of the rotary drum filter type, but the filtering medium is applied on the interior of the drum which acts as its own container. The inner surface of the drum is divided into a series of fabric-covered panels, each forming a face of a polygon inscribed within the cylinder. The compartments thus formed connect individually with an automatic valve, which, in turn, applies vacuum. Rotary vacuum drum filter. Rotary vacuum drum filter (RVDF), patented in 1872, is one of the oldest filters used in the industrial liquid-solids separation. It offers a wide range of industrial processing flow sheets and provides a flexible application of dewatering, washing and/or clarification. My 2nd Channel: sm29may1996@gmail.com. A Rotary Vacuum Filter Drum consists of a drum rotating in a tub of liquid to be filtered. Oliver -type rotary vacuum-drum filter. The technique is well suited to slurries, and liquids with a high solid content, which could clog other forms of filter. Precoated rotary vacuum drum filters (Fig. 6) are used by filtering a slurry of filter aid and water first, then subsequent product filtration. Difficult filtering materials, which have a tendency to blind, are removed with a doctor blade.
Rotary Vacuum Drum Filters process slurry and discharge cake in a continuous process. RVDFs can be used in waste water treatment, sludge dewatering, chemical manufacturing, the pharmaceutical industry, cosmetics, mineral mining and refining, and the food processing industry. It is ideal for a slurry with variable cake thickness, moisture content, and stickiness.
Slurry sits in a tank with a partially submerged drum. As the drum rotates into slurry, vacuum pulls the liquor through the industrial filter media, trapping the solid particles on its surface, forming a cake. As the drum continues to travel through slurry, the cake thickens.
As the drum emerges from the slurry tank, spray bars wash the cake, allowing air, water, and the remaining liquor to travel through the drum section into piping, through the valve, and into a vacuum receiver.
Rotary Vacuum Filter Specifications
As the rotary vacuum drum filter begins to rotate facing the ceiling, it enters the drying zone. The drum remains under vacuum, pulling air through the cake for more dewatering.
Rotary Vacuum Filter Drum
The drum then reaches its discharge zone as it roll to the position just over the slurry tank. Drum filters discharge in a variety of ways; scraper discharge, belt discharge, string discharge, roll discharge, and pre-coat discharge.