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过去,我厂铸工车间采用山东某地钙基膨润土配制湿型砂,稍大一些的铸件时常出现不同程度的夹砂缺陷。后来,我们对钙基膨润土进行活化处理,型砂性能得到提高,消除了夹砂缺陷。活化处理的作法是:混砂时,将占钙基膨润土量5％的粉状Na_2CO_3与钙基膨润土一同加入混砂机中干混3min,然后加水湿混4min。湿混时,在水的作用下,Na_2CO_3中的钠离子将钙基膨润土中的钙离子置换出来,完成了活化的过程。活化处理前后湿型砂性能见下表。
In the past, my factory foundry workshop using a calcium-based bentonite in Shandong preparation of wet sand, slightly larger castings often appear different degrees of sand inclusion defects. Later, we activated calcium-based bentonites to improve sand properties and eliminate nip defects. Activation of the practice is: sand, will account for 5% of calcium-based bentonite powder Na_2CO_3 and calcium bentonite were added to the sand mixer dry mixed 3min, then add water wet mixing 4min. Wet mixing, the role of water, sodium Na_2CO_3 calcium-based calcium bentonite will be replaced, the completion of the activation process. Wet sand performance before and after activation treatment in the table below.