通过试验发现价廉易得的无机物Ｂ，可使水玻璃砂在常温、常湿状态下实现自我溃散；详细分析了影响水玻璃砂自溃性的因素；运用大型显微镜和电子扫描显微镜（ＳＥＭ）研究发现，无机物Ｂ焙烧后在放置过程中体积膨胀，使砂粒间的水玻璃粘结桥脱落或断裂，残留强度消失而自溃散 Through the experiment found that cheap and easy to obtain inorganic B, can make sodium silicate sand at room temperature, under normal conditions to achieve self-collapse; detailed analysis of factors that affect the self-collapse of sodium silicate sand; using large and scanning electron microscopy (SEM ) It was found that after the calcination of inorganic material B, the volume expanded during the placement process, causing the water-glass bond bridge between the sand particles to fall off or break and the residual strength disappeared and collapsed