Micron-order high-density erbium oxide microsphere and preparation method thereof

Abstract

The invention provides a micron-order high-density erbium oxide microsphere. The particle size of the microsphere is 50-150mu m, and the density of the microsphere is more than or equal to 88 percent of theoretical density of erbium oxide powder. A preparation method of the micron-order high-density erbium oxide microsphere comprises the following steps: 1, performing ball-milling on a premixed solution and the erbium oxide powder until the erbium oxide powder is uniformly dispersed in the premixed solution, and adding an aqueous solution of ammonium persulfate, thus obtaining slurry of which the solid-phase content is 50-60 percent; 2, (1) uniformly mixing tween80 and an oil phase to form a first mixed solution, adding the slurry into the first mixed solution, and stirring to obtain an emulsion; (2) uniformly mixing tetramethyl ethylenediamine, span80 and an oil phase to form a second mixed solution, and adding the emulsion into the second mixed solution through a burette; and (3) cleaning the cured microsphere obtained in the step (2), and drying to obtain an erbium oxide microsphere biscuit; and 3, batching the erbium oxide microsphere biscuit, and keeping the temperature to be 1890-1910 DEG C for 170-190 minutes under inert gas shielding, thus obtaining the micron-order high-density erbium oxide microsphere.

Description

technical field [0001] The invention relates to erbium oxide microspheres and a preparation method thereof, in particular to a micron-order high-density erbium oxide microsphere and a preparation method thereof. Background technique [0002] Nuclear energy is a major direction of energy development in the future. In order to achieve high-energy output and long-term recycling of nuclear fuel, increasing the concentration of uranium in the fuel is an effective method. In order to operate safely, the design of the existing nuclear fuel stack components is based on the uranium concentration of 5wt% and below. As the uranium concentration increases, the existing nuclear fuel stack components will no longer be suitable. In order to adapt to the operation needs of high-enriched uranium fuel, one method is to redesign components that meet the requirements of high-uranium concentration, but the cost also increases; The control material is used to regulate the reaction rate, thereby ...

AI Technical Summary

Problems solved by technology

For the erbium oxide slurry with low solid content, the fluidity of the slurry is good, and microspheres with particle size meeting the requirements can be prepared by using the traditional template method, but the solid content of the slurry is too low, resulting in oxidation after sintering. The density of erbium microspheres is too low for applications as nuclear reaction control materials

To obtain erbium oxide microspheres with a density that meets the requirements, the solid phase content in the erbium oxide slurry must be increased as much as possible to increase the density of the erbium oxide microspheres obtained after sintering, but with the increase of the solid content in the erbium oxide slurry, the material The viscosity of the slurry increases and the fluidity becomes poor, which makes it impossible to extrude smoothly from the template of the corresponding size, so the traditional template method is no longer applicable

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