 |
 |
 |
 |
 |
|
|---|
 |
|
Sand Reclamation Attrition Process Step 4:
SHAKER SCREEN – After initial processing, some agglomerates (clusters of bonded sand grains and/or foreign particles) may still persist. An electrically vibrated fine mesh screen mounted directly below the Rotaclaim accomplishes the next important reclamation step. Only sand with acceptable grain size passes through this screen and is allowed to continue through the system. Step 5:
COOLER / CLASSIFIER – Sand discharged from the shaker screen still remains at an unacceptably high temperature and still contains undesirable dust and broken sand particles below required grain size. The cooler/classifier utilizes negative air pressure to lift these small particles out of the system while preserving the desirable sand. Extracted particles are transported to a dust collector. By regulating the air pressure in the classifier, the grain size distribution can be beneficially controlled. Another important cooler/classifier function is cooling sand to temperatures suitable for rebonding. A water-cooled heat exchanger traverses through the sand bed inside the cooler/classifier unit. To increase thermal transfer to the heat exchanger and facilitate dust extraction, air is blown into the bottom of the bed to fluidize the sand. The fluidizing action promotes a constant grain-against-grain rubbing/abrading condition that figures significantly in the removal of binder from all the sand grains. Units are available as part of a complete reclamation system or as independent cooler units. Next: SAN-REC-PAK |
|
||||||||||||||||||||||||||||||||||||||||||||
Core Machines | Mixers Dependable Foundry Equipment Company - Redford-Carver Foundry Products Company |
