Patent ID: 8006745
Filing Date: 2011-08-30
Classification: B22C

Abstract:
1. A molding material mixture for foundry purposes, comprising the following components: a mold sand; 0.1 to 10 percent by weight of a sodium hydroxide aqueous solution; 0.1 to 5 percent by weight of an alkali-silicate binding agent; and 0.1 to 3 percent by weight of an additive suspension; wherein: said mold sand comprises mold sand particles having a grain size of 0.1 to 1 mm; said sodium hydroxide aqueous solution comprises a concentration of 20 to 40 percent by weight of sodium hydroxide; said alkali-silicate binding agent comprises 20 to 70 percent by volume of alkali-silicate; said additive suspension comprises 30 to 70 percent by volume of amorphous, spherical SiO each of said amorphous, spherical SiO the volumetric amount of amorphous, spherical SiO