The calcined sand then cascades over a weir plate and drops down into a fluid bed cooler-classifier that employs a water-cooled tube
bundle in the fluid bed media for direct air and indirect water cooling.
For these very high temperatures, the company developed a system using horizontal water-cooled tubes
as the heat exchange surface.
It cools rapidly to 86F by fluidizing air and water-cooled tubes
, and is ready for reuse.