Abstract
A full-scale semi-industrial crystallization and refining stand was created on the basis of the Siberian Chemical Combine to develop and optimize the hydrometallurgical technology. The main purpose of this stand was to study the crystallization refining of uranium, plutonium and neptunium nitrates at a full-scale stand using significant amounts of nuclear materials. A bench experiment on crystallization refining of an undivided U-Pu-Np mixture was carried out. As a result of crystallization purification, mixed crystals of hexahydrate nitrates of hexavalent actinides were obtained. The yield of U, Pu, Np into the crystalline phase was 60, 85, and 60%, respectively. The degree of purification of the target product from elements of stable isotopes imitating fission products was about 102.
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