Uranium extraction from the waste ash after burning the Mongolian coal

The content of natural radionuclides, as well as possibility of uranium leaching from the brown coal ash of the Mongolian Thermal Power Plant, was determined. Instrumental Gamma Activation Analysis (IGAA) and X-Ray Fluorescence Analysis (RFA) for determination of the element contents were used. Leaching of uranium from the brown coal ash was carried out by the 8 M HNO3+HF (10%) mixture. Extraction of uranium from solution and separation from contiguous elements were carried out by ion-exchange resin. The natural radioelements 238U, 232Th and products of their decay were absent in the ash sample after leaching, which allows using the brown coal ash as building material