The Media Retention Screen allows for the use of larger tanks in plants with higher production tonnage. The media retention screen also reduces downtime incidents and operating costs associated with earlier generations of screen design.
Slurry flows through the cylindrical screen and into the annular region between the outer screen surface and the inner cylinder. Screened slurry then flows up through the annular region into the volute and out through the tank launder to the next tank.
The internal section of the impeller assembly incorporates a down-thrust turbine, which drives the media out of the center section to avoid concentration of the media and possible degradation. The slurry outlet on the screen matches the face on the tank launder, to which it hooks and forms a tight seal - without the need for fasteners or clamping devices.
The media retention screen can be removed from its tank and a clean one installed in its place in five to ten minutes. By closing the gate in the exit launder for this short time, the need to drop the level in the tank or to take it off line is avoided.
Specific flow rates for the media retention screen can be up to four times greater than other screening methods. Media retention screens are used in CIP and CIL plants worldwide, and are quickly gaining a solid reputation as the premier media retention screens for gold recovery.