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双快水泥自硬砂,是在铸造型砂中掺入双快水泥的一种自硬砂。其原料是石灰、矾土和萤石(约2%左右),对矾土的品位要求不高,原材料易得。双快水泥不同于普通水泥,它含有较多数量的快硬矿物组分(如氟铝酸钙和硬石膏等),能快凝快硬。在100分型砂中掺入8分水泥、6分水配合搅拌,能很快形成含结晶水很高的水化物;制成铸型,硬
Shuangkeng cement self-hardening sand is a kind of self-hardening sand mixed with double-speed cement in foundry sand. The raw materials are lime, bauxite and fluorite (about 2%), the quality of bauxite less demanding, raw materials readily available. Shuangkua cement is different from ordinary cement, it contains a greater number of fast-hardening mineral components (such as calcium aluminate and anhydrite, etc.), fast fast hardening hard. In 100 minutes sand mixed with 8 minutes of cement, 6 minutes mixing with water, can quickly form a high hydration of crystal water; made of cast, hard