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1·Through calculation, analysis and formula deduction of relevant process data for reclaimed sand, the problems are founded in reclaimed system based on it.

对公司再生砂相关工艺参数进行了计算分析与公式推导，在此基础上找出目前再生系统存在的问题。

2·The causes that residual catalysts affect the curing velocity and cured strength of used sand bonded with furan resin and reclaimed furan sand were studied and discussed deeply.

就残留催化剂和其分解物影响呋喃树脂旧砂及其再生砂的固化速度和固化强度的原因作了较深层次的研究和探讨。

3·The technological experiment of reclaimed resin bounded sand produced through dry reclamation is made, the way of which is standard.

对干法再生出来的树脂再生砂进行制芯的工艺实验，实验标准按照生产上的要求来实行。

4·The study of the hardening characteristics of reclaimed CO2 sodium silicate bonded sand shows that the residual sodium carbonate acetate is the primary affecting factor.

用CO_2法硬化水玻璃砂时，影响再生砂制备的型砂性能的主要因素是残留在砂粒表面的碳酸钠盐。