Applications:
Rotary Screens are a very simple concept that either has a slow revolving horizontal cylindrical Sieve Screen or a static U-Shaped horizontal Screen that has a slow revolving Brush/Squeezy within it. They are a non-compaction unit, used for separating solids from a liquid/slurry, dewatering, or volume reduction, and can be used in many applications and industries: as a standalone static unit, mobile unit or integrated into a process line.
How they work:
There are two types of Revolving Cylinders, Internal and External, and one type of Static, all designed for different applications:
Revolving – internal slurry entry: Called Internal Rotary Screens, have the liquid/slurry to be separated, pumped or gravity fed into the inside of the revolving Screen. Used in many applications, but liquids/slurries that are greasy or sticky, as well as certain viscous products, are not generally advised.
Revolving – external slurry entry:
Called External Rotary Screens, have the liquid/slurry to be separated, pumped, or gravity fed to the external surface of the revolving Screen. Used in many applications, but Liquids/slurries that contain hard or heavy particles are not generally advised.
Static:
Called Brush Rotary Screens, have the liquid/slurry to be separated pumped, or gravity fed into the U-Shaped static Screen. Used in many applications, but liquids/slurries that are very greasy or sticky are not generally advised. Due to the simplistic design, this is our most cost-effective Rotary Screen.
Self-Cleaning:
They are essentially a moving Rundown Screen where the screen itself or the Squeezy blades expose the Liquid/Slurry to a never-ending clean Sieve Screen, enabling them to cope with high throughputs in an uncomplicated way, and due to the nature of the moving operation, for most applications they are self-cleaning, that doesn’t require a washing system.
Non-Compaction:
Although Rotary Screens are a non-compaction separation method, they are generally more effective than Rundown Screens as the operation is continuously self-cleaning the Sieve Screen, enabling more difficult liquid/slurries to be separated to a higher level, but there are limitations:
- Constraints for removing small solid particle sizes from the liquid
- Depending on the unit, the solids in the slurry cannot be greasy/sticky, hard, or heavy
The wetness of the dry element tends to have a low Dry Matter and is non-stackable (needs contained storage), Coagulating the slurry before passing through a Rotary Screen enables significantly more small solids to be removed from the liquid but can add ongoing cost to the separation process. Visit coagulation on this site for more details, or another separation or filtration method could be considered.