METHOD OF MANUFACTURING CASTING SAND

摘要

The method comprises adding (in wt.) 5-10 wt.% binder, 1-3 % additive and 5-10 % parting agent to a synthetic sand mixing 30-40 % natural sand and 60-70 % silica sand and adjusted to neutral pH, in turn. The binder consists of mixing portland cement, meta- sodium silicate and diatom earth at the ratio of 2- 2.5:1-1.5:1-1.5. The additive consists of mixing a starch and a pitch at the same ratio. The parting agent consists of mixing calcium carbonate powder and oleic acid at the same ratio. The foundry sand is used for green sand. dried sand and core san.