半个世纪以来，人们对CO2水玻璃砂硬化机理的认识经历了化学硬化、化学硬化和物理硬化的结合、本质上是物理硬化、硬化水玻璃是脱水的高模数水玻璃等四个阶段，最终得出了CO2水玻璃砂硬化机理的新观点，并据此发明了水玻璃砂的“化学再生法”。 For half a century, people’s understanding of the hardening mechanism of CO2 water glass sand has undergone four stages of chemical hardening, chemical hardening and physical hardening. In essence, it is physical hardening, and hardened water glass is dehydrated high modulus water glass. Finally, the new viewpoint of the hardening mechanism of CO2 sodium silicate sand was deduced and the “Chemical Regeneration Method” of sodium silicate sand was invented accordingly.