Nanostructuring sodium silicate solutions applied as binding substance of molding sands in foundry

Abstract

The present paper deals with the effect of sodium silicate solution dispersion on the strength of molding sand. The authors proposed the method for modifying sodium silicate solution widely used as a binding substance while producing expendable molds in foundry, provided chemical agents are not included in the molding sand composition. Nanostructurization of sodium silicate solutions is carried out under the integral action, including hydrodynamic, acoustic and magnetic impacts, in the colloidal mill. As a result of processing, there was the obtained solution of uniform gravimetric composition providing lower sodium silicate content in molding sands up to 4.5 % without loss of strength.