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sand available for processing. Also, a full touchscreen HMI with status and fault finding indications is provided. Emissions from the thermal plant are guaranteed to be


lower than permitted by local regulations because Omega has sufficient temperature and gas retention in the furnace hood to ensure the air leaving the furnace is clean. For the alkaline phenolic system, a special inhibitor must be


pre-mixed with the sand to prevent the alkaline salts to cause low temperature fusing of sand grains. It is possible now to thermally reclaim green sand for


reuse in the core shop. A mechanical scrub-bing system employed before and after the furnace ensures all clay is removed, but the thermal reclamation is essentially the same as for the nobake system. If the foundry is a silicate user or an alkaline phenolic user and does not want to use the thermal reclamation with the additive system, another solution for further sand recla- mation is secondary attrition. Secondary attrition can be employed to enable further


binder removal. Tese units are suitable for the more difficult reclamation processes, such as the alkaline phenolic and sili- cate systems. Even in the case of furan, secondary attrition can reduce residual binder and catalyst, therefore reducing


及可用的砂量。另外,还提供了具有状态和错误指示功 能的全触屏人机界面。 由于Omega公司的加热炉中有足够的温度和气体, 可以保证熔炉排放的气体是清洁的,从而,可确保热电 厂的排放低于当地规定所允许的标准。 对于碱性酚醛树脂系统,必须预先将一种特殊的抑 制剂与砂混合,以防止碱性盐使砂粒在低温下熔融。 现在,已经可以将热法再生的粘土湿型砂在制芯工段 再次使用。在入炉之前和之后采用机械摩擦系统确保将 所有的粘土去除,而热再生工艺与用于自硬砂系统基本 上是一样的。


如果铸造厂使用的是硅酸盐或者碱性酚醛树脂,而且 不愿采用包含添加剂系统的热再生工艺,那么,还有一 个旧砂再生方案,即二次研磨。


二次研磨可以在现有的初次研磨单元之后进行,以 进一步去除粘结剂。这些设备适合于更加复杂的再生过 程,如碱性酚醛树脂和硅酸盐系统。甚至在使用呋喃树 脂的条件下,也可以通过二次研磨减少残留的粘结剂和 催化剂,从而,减少铸造厂产生的烟雾。


Shown is a thermal reclamation system.


热法再生系统 March 2015 FOUNDRY-PLANET.COM | MODERN CASTING | CHINA FOUNDRY ASSOCIATION | 73


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