... Patent NO.200510017799.6 3.Replace zircon sand in casting industry 4.Good priceUsing: Manufacture high- ... quality risers of iron and steel foundries, Lost-foam, Precoated sand;, Sodium silicon sand , Resin sandCeramic Moulding sand ... foundries, Lost-foam, Precoated sand;, Sodium silicon sand , Resin sand, Precision casting etc Ceramsite Foundry ...