<p>A reactor vessel (1) suitable for use in the reclamation of foundry sand comprises a vessel (1) having an integral upper tubular portion (2) and a lower depending frustoconical portion (3). The reactor vessel is contained within an insulating frame (6) supported by legs (7) and provided with a lid (8). The vessel is provided with diametrically opposed sand inlet (16) and sand outlet ports (21) and at least one outlet port (26) for gaseous impurities. Means are provided to fluidise the sand within the reactor vessel (1) comprising a series of oxygen containing gas inlet nozzles (31). The vessel (1) is provided with an indirect heater to heat the sand to a predetermined temperature. <IMAGE></p>
