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A two--step process for the synthesis of zeolites from coal fly ash

机译：由粉煤灰合成沸石的两步法

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摘要

The conversion offly ash into zeolites by incubation of the fly ash with alkaline solutions is a well known process which, however, usually results in a zeolitic product which still contains significant amounts of residual fly ash. Presented here is a method by which part of the silicon in fly ash can be used for the synthesis of a maximum of 85 g of pure zeolite per kg of fly ash prior to the residual being converted into zeolite by the traditional method. The cation exchange capacities ranged from 3.6 to 4.3 meq/g for the pure zeolites and from 2.0 to 2.5 meq/g for the zeolite containing residual fly ash. Tests showed that the pure zeolites are suitable for the removal of ammonium and heavy metal ions from waste water.
机译：通过将粉煤灰与碱性溶液一起温育，将粉煤灰转化成沸石是众所周知的方法，然而，通常会产生沸石产品，其仍然含有大量的残留粉煤灰。这里介绍的是一种方法，在将残渣通过传统方法转化为沸石之前，可以将粉煤灰中的部分硅用于合成每千克粉煤灰最多85 g的纯沸石。对于纯沸石，阳离子交换容量为3.6至4.3meq / g，对于含有残留粉煤灰的沸石，阳离子交换容量为2.0至2.5meq / g。测试表明，纯沸石适合去除废水中的铵和重金属离子。

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