Reclamation of ester-cured phenolic resin bonded foundry sands

Details Reclamation of ester-cured phenolic resin bonded foundry sands Reclamation of ester-cured phenolic resin bonded foundry sands

B - Operations, Transporting

22

C

B22C 5/00 (2006.01) B22C 1/02 (2006.01)

Patent

CA 2143743

Attrition reclaimed ester-cured phenolic resin bonded sand is subject to thermal treatment prior to re-use. Prior to the thermal treatment, however, the attrition reclaimed sand is contacted with an additive which converts potassium compounds to a form having a melting point of at least 550 °C and the thermal treatment is effected at a temperature below that at which the resulting potassium compound fuses.

Du sable lié par résine phénolique durcie par ester, et récupéré par frottement, est soumis à un traitement thermique avant d'être réutilisé. Avant d'être soumis à ce traitement thermique, cependant, le sable récupéré par frottement est mis en contact avec un additif qui convertit les composés de potassium sous une forme présentant un point de fusion d'au moins 550 C, et le traitement thermique est effectué à une température inférieure à la température de fusion du composé de potassium obtenu.

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