Method and device for microwave calcination of uranium chemical concentrate

Abstract

The invention relates to a method and device for microwave calcination of a uranium chemical concentrate, and belongs to the technical field of microwave metallurgy. The method comprises leading the uranium chemical concentrate into high-temperature waste heat flue gas for preheating the cold uranium chemical concentrate, and performing three segments of calcination. The device is composed of a microwave generator, a spiral stirring device, a microwave control device, a temperature measuring device and a flue gas circulation purifying system. According to the method, industrial continuous production is realized; the high-temperature waste heat flue gas is fully utilized; and self-circulation treatment is implemented. The uranium chemical concentrate can be directly and fast heated; the heat loss of the material is reduced; and the energy utilization rate is increased. The uniformity of the product is improved; emission of harmful impurities and gas is avoided; and clean production is realized. The device is high in equipment automation degree and strong in controllability.

Description

technical field [0001] The invention relates to a method and a device for microwave calcining uranium chemical concentrate, belonging to the technical field of microwave metallurgy. Background technique [0002] Uranium is the material basis for the development of the nuclear energy industry, and has great strategic significance for ensuring national security, energy security, and environmental security. The uranium nuclear fuel is mainly through the grinding-acid or alkali leaching-mother liquor separation-ion exchange method (also known as adsorption method) and solvent extraction method for solution purification and impurity removal-precipitation process, and then the precipitate is washed, filtered and dried. The hydrometallurgy product uranium chemical concentrate is obtained, and the uranium chemical concentrate is calcined to obtain the nuclear pure product U 3 o 8 . [0003] u 3 o 8 It is the measurement benchmark of uranium product output and has a very importa...

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Problems solved by technology

[0004] As a green and efficient heating method, microwave can selectively heat materials through energy dissipation inside the materials. It has the advantages of uniform heating, high thermal efficiency, and shortened reaction time, which cannot be compared with conventional heating. The patent (application number 200910094840.8) A method of microwave calcining ammonium diuranate to produce U3O8. Although it achieves rapid heating of materials, short heating time (calcination time) and certain energy-saving effects, the method is limited to small amounts of materials. (15g) small-scale experiment, the amount of processed materials was small, and industrial continuous feeding and discharging of materials and large-scale production were not realized; secondly, the material was not stirred during the calcination process, resulting in poor product uniformity, and the high-temperature flue gas generated during the calcination process was not treated. , there are problems such as low energy heat utilization rate and high production cost, and the emission of harmful flue gas will have a certain impact on the environment

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