Abstract: Natural zeolites are used in numerous economic branches. Their limited resources make it necessary for researchers to look for synthetic products. The chemical composition of fly ash are similar to those of zeolites they can be used as raw material for zeolite synthesis. The aim of the research was to assess feasibility of zeolite synthesis from fly ashe by chemical conversion method. For that purpose hard coal fly ash collected from under electrofilters of coal-fired power plants in Kielce, Rzeszów and Lublin was used.The effect of chemical activation of ash upon its sorption properties was investigated. Chemical conversion method consisted in treatment of fly ash with NaOH solution in determined temperature and pressure conditions. The morphology of fly ash grains before and after modification was examined by scanning electron microscope. The influence of structural changes of single fly ash grains upon their sorption properties was evaluated. The adsorption level was tested on a model test-stand by spectophotometric method with methylene blue.
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