System Includes

GMD PNU™ Scrubber Blower(s) for Fluidizing and Blast Air Plenum Pressure Damper Controls Options: Surge Bin PLC Controls Feed System Graphics Controls Package GMD PNU™ Cooler Features Include: High Scrubbing Efficiency Absence of Moving Parts Continuous Processing Air Classification Air Classification, i.e. Controlled Fines and Dust Removal Low Energy Consumption Unattended Operation Total System Concept "Guaranteed": Rated Capacity Loss on Ignition Yield (On Base Silica) Sand Screen Distribution

Cleaning: In the GMD PNU™ Scrubber, the sand grains are withdrawn from the fluidized bed bottom by the velocity of the blast air as it exits the nozzle, forced up the blast tube and impacted against layers of sand grains being held against the target by the blast air - i.e. sand-to-sand abrasion not sand-to-metal. Having given up its energy, the sand falls to the fluid bed where it is collected and again withdrawn and blasted up the blast tube. This repeated vigorous sand-to-sand contact causes the organics (binder), clay and metallic oxides to dislodge from the sand grains. Any material removed from the sand grains during this process along with unwanted silica fines are drawn off in a controlled atmosphere and exhausted to the dust collection equipment. Recirculation of the sand continues until finally the sand passes over the final weir, discharging from the GMD PNU™ SCRUBBER ready for reuse by the foundry. It is individual treatment of the sand grains that assures consistent quality of the final product. Any treatment of the sand other than the treatment mentioned above is not considered sand reclamation, but rather sand reconditioning. A Chemically - Bonded Sand Reclamation System requirement is to remove as much as possible of the residual binder attached to the sand grains or contained in the cracks, crevices and cleavage plains of the return sand grains along with the unwanted silica "fines".. Additionally, the binder systems used in today's foundry are more durable and effective than those in the past have been. It is this durability that dictates that a sand reclamation system must treat the sand grains more aggressively to assure a stable reclaimed product cycle after cycle.

"reclamation of sand requires that the sand grains receive the amount of work required to make the final product usable in the given casting situation. The process must assure that the sand grains receive this work on an individual grain-to-grain basis."

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