The synthesis of zeolites using waste as a source of Si and Al is well known, and light coal ash has been studied to minimize the problems of waste management and mitigate environmental effects. The residue used in this work was supplied by Coal Workers Assistance Society (SATC) Criciúma–SC/Brazil, and had 24.09% Al₂O₃ and 54.25% SiO₂ in its chemical composition. Synthesis studies using this residue with the objective of obtaining LTA zeolites were carried out by hydrothermal means, alkaline fusion, and the combination of the two methods, varying parameters such as crystallization time, Na/T ratio, OH/ratio, ultrasound exposure, gel agitation temperature, and the alkaline melting temperature of the residue. The results were characterized by X-ray diffraction (XRD) techniques and scanning electron microscopy (SEM-FEG). It was possible to obtain 70% crystalline zeolite type LTA for the first time at mild conditions with temperatures below 200 °C by alkaline fusion with smaller amounts of NaOH and short times (2 h). Thus, suitable parameters were determined for future scaling.

中文翻译：

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轻煤灰合成LTA型沸石的参数和方法的优化

使用废物作为Si和Al的来源来合成沸石是众所周知的，并且已经研究了轻煤灰以最小化废物管理的问题并减轻环境影响。这项工作中使用的残留物由煤炭工人援助协会（SATC）Criciúma–SC /巴西提供，并具有24.09％的Al ₂ O ₃和54.25％的SiO _2。在化学成分上。目的是通过水热法，碱熔法以及这两种方法的结合，以结晶时间，Na / T比，OH /比率，超声暴露，凝胶等各种参数进行合成研究，以获取LTA沸石为目的。搅拌温度和残留物的碱性熔化温度。通过X射线衍射（XRD）技术和扫描电子显微镜（SEM-FEG）对结果进行表征。在温度低于200°C的温和条件下，通过碱熔与少量NaOH和短时间（2 h）首次获得70％的LTA型结晶沸石是可能的。因此，确定了合适的参数以用于将来的缩放。