不同加碱活化方法对粉煤灰合成沸石的影响

The Effect of Different Alkalinizing Activation Methods on Synthesis of Zeolites from Fly Ash

粉煤灰中含有一些活性较差的莫来石和石英结晶体,在直接水热条件下,它们很难参与沸石晶体的合成反应,严重影响了粉煤灰合成沸石晶体产品的纯度和结晶度。通过对湿法加碱-煅烧和干法加碱-煅烧两种活化方法的比较,证明了湿法加碱-煅烧方法不仅完全消除了粉煤灰中原有的结晶,生成了大量高活性的硅铝酸盐矿物,而且能在后续的水热合成过程中促进沸石向单晶转化。本文的研究对粉煤灰合成高质量沸石晶体具有一定的指导作用。

In the condition crystals, thus the composition of fly ash, there are some crystals with less activity, such as quartz and mullite. Under of direct hydrothermal synthesis, they are very difficult - to participate in synthetic reaction with zeolite have severe effect on the purity and crystalline degree of zeolites. By means of comparing wet - method alkalinizing calcination and dry -method alkalinizing calcination, experiment results have proved that wet - method alkalinizing calcination not only can eliminate original crystals in fly ash, produce a large amount of silico aluminate with high activity, but also can promote zeolite to convert into single crystal in the subsequent process of hydrothermal synthesis. The thesis has certain instructive function to synthesize high quality zeolites from fly ash.