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水溶性砂型是日本的一项新发明,它的特点是通过二氧化碳,使砂型容易硬化,而且容易落砂。砂型制造时,和通常一样:首先将铝氧粉砂(Al_2O_3)与铝酸钠(Na_2O/Al_2O_3)在空气中进行充分搅拌,接着在有二氧化碳气体的介质中进行搅拌。使铝酸钠分解到20～60％(重量)的程度。此种造型方法的硬化反应能够在短时间内完成,而且砂型的抗压强度也很好。另外,铅酸钠的克分子量是1.3～1.7,而当它的水分量为50％重量的时候,不分解,能够保存。直至造型时也不要粘结剂。铝氧粉砂与铝酸钠的配合
Water-soluble sand is a new invention in Japan. It features carbon dioxide, which makes the sand harden easily and is easy to shake off. Sand production, and as usual: First, aluminum powder silt (Al_2O_3) and sodium aluminate (Na_2O / Al_2O_3) in the air is fully stirred, followed by stirring in a carbon dioxide gas medium. The sodium aluminate is decomposed to the extent of 20 to 60% by weight. This modeling method of hardening reaction can be completed in a short time, but also the compressive strength of sand is also very good. In addition, the molecular weight of sodium lead is 1.3 to 1.7, and when it is 50% by weight, it can be stored without decomposition. Do not glue until styling. Alumina silt and sodium aluminate with