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Metal Casting Technologies : September 2007
83 WHO'S WHO OF METALS -- ANNUAL 2007/8 NEW GREEN SAND RECLAMATION This new sand reclamation system was engineered to treat the sand mixture made of green sand and core sand. The treated sand is suitable to be used in the core shop as new sand. The complete cycle is made of four treatments: - reduction of lumps and sieving of the sand to eliminate impurities; - first pneumatic scrubbing to eliminate the big part of the spent bentonite; - thermal reclamation to burn/eliminate organic products, like resin of the core sand, and coal dust and to de-activate the residual MB bentonite; - second pneumatic scrubbing to eliminate the deactivated bentonite. All the dust and fumes from the thermal reclamation are extracted by properly engineered dust collectors. Thanks to the design made in separate steps, the installation allows the maximum flexibility of use: for example the sand after the first pneumatic scrubbing can be diverted to the green sand moulding line and used as green sand, while the sand after the complete treatment can be used in the core shop. ADVERTISING PROMOTION