COATED SAND PRODUCTION METHOD, COATED SAND OBTAINED BY THE SAME, AND CAST PRODUCTION METHOD

摘要

PROBLEM TO BE SOLVED: To provide a coated sand excellent in cast characteristics such as strength and capable of suppressing or preventing deterioration of the obtained cast caused by moisture absorption to solve problems about aging caused by long-term storage, and improving normal temperature liquidity and filling properties.;SOLUTION: The coated sand production method for producing a coated sand having normal temperature liquidity and being formed by forming a coating layer of a caking additive on a surface a refractory aggregate is provided. As the caking additive, sodium silicate solution having SiO₂/Na₂O molar ratio of 3.0 to 4.0 is used and the solution has a viscosity of 10 to 50 cP at 25°C to be mixed with the refractory aggregate.;COPYRIGHT: (C)2014,JPO&INPIT