Abstract.The fly ash, from the combustion of coal to produce energy and heat, is industrial waste, which large accumulations represent a serious environmental threat. To reduce the environmental burden and improve the economic benefits of energy production the science and industry focus on the transformation of coal combustion by-products into new functional materials. The fly ash was studied by modern analytical methods. As a result of the hydrothermal reaction several types of zeolites were synthesized from the fly ash: analcime, faujasite (zeolite X) and gismondine (zeolite P). It was shown that the experimental conditions (temperature, reaction time and alkali concentration) have a significant influence on the type of zeolite and its content in the reaction products. The series of experiments resulted in building approximate
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