水玻璃砂砂粒表面结构形貌分析

电镜分析表明，采用ＣＯ２法的水玻璃砂中，碳酸钠盐呈花草状存在于砂粒表面；采用酯硬化法的水玻璃砂中，杆状醋酸钠盐既存在于砂粒表面，又分布于水玻璃膜内部，水玻璃砂强度主要取决于脱水水玻璃膜的点桥连接强度．旧砂再生复用取决于盐类晶体的去除程度和相应工艺措施的合理性

Research on Surface Structure and Appearance of Grains of Sodium Silicate Bonded Sand

SEM shows that flowers and plants like sodium carbonate exists on the surface of dried sodium silicate bonded sand grains prepared by carbon dioxide, and that baculiform sodium acetate exists not only on grain surface but also inside sodium silicate coating when sodium silicate bonded sand was dried by acetic ester. The strength of sodium silicate bonded sand depends mainly on the bridge connecting strength of dewatered sodium silicate coating. The reclaimation and reuse of used sand is determined by the extent to which salinous crystal is eliminated and reasonableness of relevant technological methods.