Method and apparatus for cold reclamation of foundry sand

Details Method and apparatus for cold reclamation of foundry sand Method and apparatus for cold reclamation of foundry sand

B - Operations, Transporting

22

C

B22C 5/08 (2006.01) B22C 5/18 (2006.01)

Patent

CA 2236628

Method and apparatus for reclaiming sand from a foundry sand containing, inter alia, a binder by cooling said foundry sand to a temperature at or below 0°C (32°F) followed by separation of the sand from the binder while the sand is maintained at a temperature at or below 0°C (32°F). In one embodiment the used foundry sand containing a binder and other additives is cooled to a temperature of at least -40°C (-40°F) followed by treatment to separate sand from binder materials and other non-sand fractions. Foundry sands with clay binders can be pre-treated to adjust the water content to 1% to 15% by weight prior to being cooled.

Procédé de récupération de sable de moulage contenant, entre autres choses, un liant, et dispositif associé. Le sable de moulage usé est refroidi à une température égale ou inférieure à 0 oC (32 oF) et maintenu à une température comprise dans cette plage pour la séparation du sable et du liant. Dans une variante de cette invention, le sable de moulage usé contenant un liant et d'autres additifs est refroidi à une température d'au moins -40 oC (-40 oF) avant d'être séparé du liant et des autres matières. Le sable de moulage contenant un liant argileux peut être soumis à un traitement préalable destiné à en réduire la teneur en eau à une valeur comprise entre 1 et 15 % en poids, avant d'être refroidi.

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