Reclamation mechanism of waste green sand adhered with oolitics

摘要

When oolicits adhere to green sand, it becomes waste green sand. Green sand is reclaimed for the purpose of mainly peeling off the oolitics. In this study, we reclaimed oolitics sand by 3 representative processes, calcining + friction reclamation, friction reclamation, and grindstone reclamation. Calcining + friction reclamation is more suitable for the shell mold process, and friction reclamation for the cold box process. The change of waste green sand in calcining + friction reclamation was asfollows the total clay changed to oolitics after calcining. This oolitics and that adhered to the waste green sand from the beginning were removed by friction reclamation. When the respective oolitics were removed, the reclamation sand showed the samestrength as the new sand, indicating the end of reclamation can be determined from the oolitics quantity. Also, when the sand is reclaimed by friction reclamation, the strength is higher than the new sand because the sand shape is improved.