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采用Ｌ＿８（２＿７）和Ｌ＿（２７）（３￣（１３））正交试验方法，辅以扫描电镜分析，对于法再生砂应用于酯硬化水玻璃自硬砂的硬化特性和工艺性能进行了初步探讨。指出残留醋酸钠盐是主要控制因素。再生砂中适量残留水份有利于性能控制。提出了添加剂Ｌ应用的可行性，具体工艺已经在生产中得到应用。
Using the orthogonal experiment method of L_8 (2_7) and L_ (27) (3 ~ (13)), combined with the scanning electron microscope analysis, the hardening characteristics and process performance of the recycled sand for the esterified water glass self-hardening sand Discussion. Pointed out that the residual sodium acetate is the main control factor. The amount of residual water in regenerated sand is good for performance control. The feasibility of using additive L is put forward. The specific process has been applied in production.