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水玻璃砂工艺性能好、便宜、无毒,所以在很长时期里得到广泛应用。世界各国有许多机构在专门研究水玻璃砂推广应用。水玻璃砂工艺的发展可分为三阶段。第一阶段:40年代末到50年代初拟定了CO_2硬化过程,得到广泛的应用,直到今天。第二阶段:50年代初到60年代拟定了利用固体粉末硬化剂的自硬砂。50年代末提出用氟硅酸钠、氟钛酸钠、氟钨酸钠、氟锆酸钠等盐
Sodium silicate sand process performance, cheap, non-toxic, so in a very long period of time has been widely used. Many countries in the world have specialized in the promotion and application of sodium silicate sand. Water glass sand process can be divided into three stages of development. The first stage: From the late 1940s to the early 1950s, CO 2 hardening was developed and has been widely used until today. The second stage: From the early 1950s to the 1960s, self-hardening sand using solid powder hardeners was developed. In the late 1950s, sodium fluorosilicate, sodium fluorotitanate, sodium fluorotungstate and sodium fluorozirconate were proposed