通过对不同的初始含水量的水玻璃旧砂进行干法再生处理 ,经抽样化学分析检测再生效果 ,揭示了旧砂含水量与再生砂的 Na O2 残留量的关系。含水量小于 0 .1%干法再生效果很佳 ,含水量越大再生效果越差 ,含水量大于0 .7%的水玻璃旧砂难以机械干法再生 Through the dry regeneration of water glass sand with different initial water content, the regeneration effect was detected by sampling chemical analysis, which revealed the relationship between the water content of old sand and the residual Na O2 in the recycled sand. Water content less than 0.1% Dry regeneration is very good, the greater the water content, the worse the regeneration effect, water content greater than 0.7% of the water glass old sand is difficult mechanical dry regeneration