试验研究了残留水玻璃和残留酯对酯硬化水玻璃旧砂及其干法再生砂性能的影响。结果表明 ,残留酯是使酯硬化水玻璃旧砂及其干法再生砂可使用时间变短、再粘结强度下降的主要原因。因此 ,去除残留酯是再生酯硬化水玻璃旧砂的主要任务之一。而采用湿法再生或干法再生前对旧砂进行 32 0～ 35 0℃的加热处理 ,是除去旧砂中残留酯的有效方法 The effects of residual sodium silicate and residual ester on the properties of esterified sodium silicate sand and its dry-process recycled sand were studied. The results show that the residual ester is the main reason for the short service life of the esterified sodium silicate sand and its dry recycled sand, and the decrease of the bond strength. Therefore, removing residual esters is one of the major tasks of regenerating esterified hardened sodium silicate sand. However, it is an effective method to remove the residual ester in the old sand by heating the old sand at 32 0 ~ 35 0 ° C before wet regeneration or dry regeneration