配制流态破可用粘土不超过2—3%的任何型砂。砂子颗粒以d0＝ 0．30毫米为宜。用模数为3．3—3．5、比重为 36—38°波美的水玻璃作粘结剂,可保证流态砂在10—20分钟硬化,并得到良好的溃散性。硬化剂采用铬铁矿渣,其湿度不应超过0．5%,最适用的矿渣要保证型砂和水玻璃搅拌后10~15分钟开始硬化,从配砂到 Preparation of flow-breaking available clay does not exceed 2-3% of any sand. Sand particles to d0 = 0.30 mm is appropriate. With a modulus of 3.3-3.5, the proportion of 36-38 Baume water glass as a binder, to ensure fluid sand hardening in 10-20 minutes, and get good collapsibility. Hardener using ferrochrome slag, the humidity should not exceed 0.5%, the most appropriate slag to ensure that the sand and water glass 10 ~ 15 minutes after stirring start hardening, from the sand to