A METHOD OF IMPROVING THE PROPERTIES OF RECLAIMED SAND USED FOR THE PRODUCTION OF FOUNDRY MOULDS AND CORES

摘要

Particulate refractory aggregate aggregate elutab1e alkali is treated with a particulate active clay having a particle size of less than 0.5 mm in order to reduce the level of the elutable alkali. Sand recovered f rom spent foundry moulds and cores produced from alkalin e binders can be treated to reduce its elutable alkali content and then recycl ed for further foundry use.