Many foundry managers and operators wonder about the possibility and/or effectiveness of removing airborne sand fines by using a fluid bed classifier. The following summary will help anyone to troubleshoot the sand classification process to increase fines removal. Removing sand fines through the classifier depends on several process details, namely 1) dwell time; 2) fluidizing air volume; and 3) exhaust negative pressure in the head space. Dwell time — The sand in a fluid-bed system ...

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