Formation of nanocrystalline zeolites from industrial waste materials under strong alkaline conditions at short reaction times and low temperatures

该项目致力于开发新的模型，将废水处理后的造纸污泥、焚烧灰渣和富含硅酸盐的滤渣用于低温碱消化工艺合成沸石。到目前为止，在废物消化和凝胶结晶的两步反应过程中，得到了LTA和X沸石。还成功地制备了以造纸污泥燃烧灰为载体的钙型沸石。相比之下，在直接转化过程中观察到了多相产物，但这些研究引发了有趣的新问题。回答(1)早期极短反应时间的影响，(2)起始废料在室温下的碱性活化和(3)添加剂如NaAlO2的最佳时间的作用，必须作为本补充研究建议的主题而被提及。计划了三个新的反应系列，并期望从结果中了解在仅60°C的情况下将废物转化为有价值的沸石的最佳碱转化方法的基本知识。

The project deals with the development of new models for the insertion of paper sludge combustion ash and silicate rich filter residues from waste water reconditioning for zeolite synthesis using a low temperature alkaline digestion process. The results, worked out up to now, yield to zeolites LTA and X in a two step reaction process of waste materials digestion followed by gel crystallization. Preparation of the Ca-form of the zeolites under insertion of paper sludge combustion ash was also successful. In contrast, multiphase products were observed under a direct conversion process, but these investigations led to interesting new questions. Answering the question of (1) an influence of the early very short reaction period, (2) an alkaline activation of the starting waste materials at room temperature and (3) the role of the otimal time of admixing aditives like NaAlO2 have to be mentioned as the subject of this present additional research proposal. Three new reaction series are planned and basic knowledge on an optimal alkaline transformation of waste materials into valuable zeolites at only 60°C is expected from the results.