COMPOSITION WITH RECYCLED SAND FROM THE PRODUCTION OF CASTING MOLDS AND CASTING CORES, THEIR PRODUCTION METHODS, THE PRODUCTION METHOD OF CASTING MOLDS AND CASTING CORES

摘要

PCT No. PCT/GB94/01005 Sec. 371 Date Dec. 29, 1995 Sec. 102(e) Date Dec. 29, 1995 PCT Filed May 10, 1994 PCT Pub. No. WO94/26439 PCT Pub. Date Nov. 24, 1994Particulate refractory aggregate containing elutable 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 from spent foundry moulds and cores produced from alkaline binders can be treated to reduce its elutable alkali content and then recycled for further foundry use.