THERMAL RECLAMATION OF FOUNDRY SANDS USING REPURPOSED SAND DRYER EQUIPMENT

摘要

In Finland, foundries are experiencing rising pressure to properly recycle surplus foundry sands, as environmental legislations get tighter and sands become more difficult to landfill. While most Finnish foundries have different methods of mechanical reclamation, thermal reclamation is still much underutilized, as only one foundry currently reclaims their used molding sand this way. This changed in the spring of 2017, when a foundry raw material supplier acquired an out-of-operation industrial plant with the idea of converting its sand drying facility into a thermal reclamation plant. This paper shortly describes the development of the equipment, the theory of three foundry sand binder systems, test runs of reclaiming sand in the new plant and results of analyzing the reclaimed properties of the sand samples.