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型砂的强度取决于粘结剂包覆膜的强度,而包覆膜与粘结剂的结构有关。可以认为,在型砂中以最低的水玻璃加入量获得坚固的粘结膜,使型砂的工艺强度与残留强度具有适当的比例已成为可能。采用不同的硬化方法对由诺维斯克露天矿的3KO2A砂及0．5~7%的水玻璃(M＝2．6)组成的型砂进行了比较,在实验室碾砂机上制备试验型砂。以补充加水的方法保持到砂固定的含水量(3．5%)。型砂在加入水玻璃后混碾2．5分钟。标准试样以三种方法进行硬化(相应于表中的1~3);吹(延续时间1分钟)CO_2气;在型砂中加入4%铬铁矿渣;吹(延续
The strength of the molding sand depends on the strength of the adhesive covering film, which is related to the structure of the adhesive. It is believed that it is possible to obtain a sturdy bonding film with the lowest amount of sodium silicate added in the molding sand so that the process strength and the residual strength of the molding sand are properly proportioned. Different hardening methods were used to compare the sand composed of 3KO2A sand and 0.5 ~ 7% water glass (M = 2.6) in the Noyesk open-pit mine, and the test sand was prepared on a laboratory sand mill. To add water to maintain a fixed amount of water to the sand (3.5%). The sand is mixed and ground for 2.5 minutes after adding water glass. Standard samples were hardened in three ways (corresponding to 1 to 3 in the table); blowing (duration 1 minute) of CO 2 gas; adding 4% chromite slag to the molding sand; blowing