Process and apparatus for reclaiming foundry scrap sands

Abstract

In a process for reclaiming foundry scrap sand, containing organic and inorganic binders, the comminuted foundry sand is precleaned in a dry state by allowing it to impinge and/or by grain-against-grain friction, is regenerated by thermal treatment, and is subsequently subjected to a final cleaning in the dry state, separated slurry materials being separated from the regenerate by a gas stream. An apparatus for conducting the process comprises a rotary drum (5, 46, 107) and/or a shotblasting cleaner (102) for precleaning, a fluidized-bed furnace (9, 51, 108) for thermal regeneration, and a further rotary drum (10, 59, 109) and/or a further shotblasting cleaner (151) for the final cleaning, and is accommodated in several container-type vessels (I through IX) which latter can be set up in superimposed relationship.

Dependencies are inferred from the claim text.