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In Poland, like in many other countries, research is conducted toward creating sorbent materials based on fly ashes. The present shows the synthesis of fly ash from brown coal combustion in pulverised-fuel boilers of the Be?chat?w Power Plant. The synthesis was conducted in an autoclave using the hydrothermal method with alkaline activation. The conditions for the synthesis were: temperature of 170В°C, NaOH aqueous solution. The chemical composition of the fly ash as well as the products of the synthesis was deter...