Abstract
The additive ZY, citric acid and ammonium chloride were used to modify sodium silicate and the influence of modified sodium silicate on the properties of molding sand has been investigated in this paper. The experimental results showed that the additives made the viscosity of sodium silicate increase and its surface tension reduce, the gel particle size of sodium silicate hardened by CO2 gas refine, leading to the strength at room temperature and the collapsibility of molding sand improved. The mechanism of sodium silicate modified by additives was also analyzed and it was concluded that the ZY was the best for modification of sodium silicate among experimental additives.
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