It is generally considered difficult to reclaim foundry waste sand containing water glass into clean sand by dry and wet methods. In particular, sand reclaimed by the usual dry method has limited quantity for reuse, because Na
2O accumulates in the sand. In our previous report, we stated that the sand containing water glass became easy to scrub and clean after high temperature treatment, because the treatment lowers the bonding force of water glass. But this kind of sand easily sticks together at high temepratures, therefore generally speaking, thermal treatment can not be applied in practice for reclamation. We report the dicovery of a new thermal method which uses a special lean fluidized bed for the reclamation of sand containing water glass which does not stick together at high temperatures.
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