Kiln Supplementary Equipment

Sieve Bend

The transfer of carbon requires water, significant amounts of water; it is estimated that the ratio of water to spent carbon in the slurry at the beginning of the Regeneration/Reactivation process is around 10:1.

Ansac’s innovative sieve bend or de-watering screen is immensely popular amongst clients for its ability to strip up to 90% of the water contained in the slurry away from the carbon with virtually no running cost or risk of equipment failure. Ansac’s sieve bend uses no moving parts or vibrating motors, relying on gravity alone to prepare the carbon feed for regeneration.


Supplied standard with each kiln, the feed hopper is designed to hold a single batch of carbon or act as a surge bin for continuous systems. Hoppers are epoxy lined to prevent pre-mature corrosion of the vessel. Hoppers can be customised to suit operation needs.


Ansac have introduced a Pipescreen into the pre-drying system in order to further decrease the levels of water contained in the carbon. This step acts as a secondary de-watering screen after the sieve bend taking water levels down to around 35%. Sitting below the Hopper, the Pipescreen contains an internal mesh screen that will allow gravity to pull the water through the carbon and be siphoned out through a singular discharge port.

Slide-Gate Valve

The Ansac Slide-Gate valve sits below the Pipescreen creating a seal in order to allow the carbon to release some of the contained water. The Slide-Gate valve contains a pneumatically driven, rubber lined blade that creates a water tight seal above the kilns Pre-dryer. The Slide-Gate valve is controlled from either the electrical cabinet of the local HMI Screen.

Sizing Screen

Every carbon regeneration kiln requires an effective discharge seal and quench point for the carbon before it can be returned to the slurry circuit; Ansac have developed a highly efficient sizing screen that can be tailored to the specific requirements of our client’s process.

The removal of fine carbon is a crucial step in the reactivation process as undersized carbon particles have the ability to adsorb gold; by removing fine carbon particles at the end of the regeneration process, Ansac are able to minimise gold losses.

The sizing screen uses a small quench tank containing process water into which the regenerated carbon is fed; this is then discharged into an open tank with a vibrating mesh screen set at a specific aperture. This aperture will allow only the correct and active carbon particles to be passed back into the elution circuit with all undersized particles being disposed of.