Reclamation of ester-cured phenolic resin bonded foundry sands
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United States of America Patent
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Issued Date -
Jul 26, 2007
app pub date -
Apr 19, 2005
filing date -
May 11, 2004
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A method of preparing a particulate refractory composition for use in the manufacture of foundry moulds and cores from spent foundry moulds or cores formed of refractory material and an ester-cured phenolic resin binder, the method comprising the steps of breaking up the spent foundry moulds or cores, mixing the resulting broken material with a particulate pozzolan additive and subjecting the mixture to a heat treatment at a temperature in the range 450 to 900.degree. C.
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