PARTING SAND FOR MOLDS AND CORES Russian patent published in 2003 - IPC

FIELD: foundry. SUBSTANCE: parting sand contains the following amounts of components, wt.%: binder LST 4.0-6.0; binder KO 2.0-4.0; oil-containing slime formed in primary settling tank after treatment of circulating water in production of engineering carbon 1.0-3.0: the balance, quartz sand. When mold is filled with liquid metal, aromatic hydrocarbons contained in oil-containing slime sublimate. Coming in contact with cast metal, aromatic hydrocarbons decompose to form carbonic film preventing metal surface from reaction with gases of mold atmosphere and quartz sand. This is how surfaces of castings are prevented from burning-on. EFFECT: higher efficiency of use. 2 cl, 2 tbl, 5 ex