Regeneration of foundry sand bonded by hardened phenolic resin ester.

摘要

Phenolic resin bonded sand CURED OF ESTER, RECOVERED WEAR OR ROCE, TERMICO is treated before further use. PRIOR TO HEAT TREATMENT, HOWEVER, THE ARENA RECOVERED WEAR is contacted with an additive that converts POTASH compounds to a form having a melting point below 550 C MELTING, AND HEAT TREATMENT IS AT A LOWER TEMPERATURE one in which RESULTING BLOWS THE COMPOUND POTASSIUM.