Process for producing casting molds using a dry flowable blended sand

Abstract

Abstract A method is described for producing a dry flowable blended sand and using this sand in making a casting mold. The blended sand is prepared by mixing a refractory particle, such as silicious sand, with an alkali metal silicate solution, such as a sodium silicate solution of at least 40 percent (weight) solids content whose SiO2 to Na2O molar ratio has previously been adjusted with NaOH solution of at least 40 percent (weight) solids content to a molar ratio of 0.7 to 1.1 to thereby precipitate and deposit crystalline alkali metal silicate on the surface of said refractory particle, and thereafter blending the thus treated refractory particle with a powder of silicon, silicon alloy such as ferrosilicon, silicide such as calcium silicide or a mixture thereof, pouring the blended sand into a molding frame and allowing it to harden therein. The precipitation and deposition of the alkali metal silicate from solution is hastened by the addition of an alcohol such as methanol, or metal salt such as NaCl to the alkali metal silicate solution.

Inventors

• 👤 T Arita
• 👤 T Akanuma

Bibliographic Details