Uranium oxide micro-sphere and preparation method thereof

A technology of uranium oxide and microspheres, which is applied in the field of uranium oxide microspheres and its preparation, can solve the problems of no porous structure, large size, complicated process, etc., and achieve simple process, small size, and strong radiation resistance Effect

Active Publication Date: 2014-07-23
INST OF HIGH ENERGY PHYSICS CHINESE ACADEMY OF SCI
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Problems solved by technology

[0004] The existing process of preparing dense uranium oxide ceramic microspheres is

Method used

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  • Uranium oxide micro-sphere and preparation method thereof
  • Uranium oxide micro-sphere and preparation method thereof
  • Uranium oxide micro-sphere and preparation method thereof

Examples

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preparation example Construction

[0036] see figure 1, the invention provides a method for preparing uranium oxide microspheres, comprising:

[0037] S101, hydrothermal reaction:

[0038] The mixed aqueous solution is subjected to a hydrothermal reaction to obtain a sea urchin-shaped uranium-containing microsphere precursor, wherein the mixed aqueous solution includes an aqueous uranyl nitrate solution, glycerol and urea; the mixed solution can be obtained by adding glycerol and urea to an aqueous uranyl nitrate solution. aqueous solution, and the hydrothermal reaction can be carried out in a reactor.

[0039] S102, washing and drying:

[0040] Washing and drying the uranium-containing microsphere precursor; the uranium-containing microsphere precursor can be washed and precipitated several times with deionized water and ethanol respectively, and then transferred to an oven at 60° C. for 12 hours to dry. Optionally, other solvents can be used to wash the uranium-containing microsphere precursor, and other t...

Embodiment 1

[0055] Add 1.5mL of glycerin and 0.075g of urea to 2mL of 0.2mol uranyl nitrate aqueous solution, stir to dissolve, transfer the mixed solution to a reactor at 160°C for hydrothermal reaction for 5 hours, and obtain sea urchin-shaped uranium-containing microns with good uniform size and sphericity. Ball precursor (XRD pattern see figure 2 d), the size of the microsphere precursor is about 1.7-1.9μm, its surface is composed of nanorods with a diameter of 20-40nm and a length of 200-400nm, and the interior is a loose porous structure composed of nanoparticles with a particle size of 20-50nm (see Image 6 ).

[0056] The uranium-containing microsphere precursor was washed with 10 ml of deionized water each time for 3 times, then washed with 10 ml of ethanol each time for 3 times, and then dried in an oven at 60° C. for 12 hours.

[0057] The above dried uranium-containing microsphere precursor is placed in a tube furnace for high-temperature pyrolysis, the gas atmosphere is air...

Embodiment 2

[0059] The dry uranium-containing microsphere precursor obtained in Example 1 was placed in a tube furnace for high-temperature pyrolysis, the gas atmosphere was air, the pyrolysis temperature was 625°C, the heating rate was 5°C / min, and the constant temperature time was 1h, to obtain U with a size of 1.5-1.7 μm 3 o 8 Porous microspheres (XRD pattern see figure 2 b), the outer surface is a smooth shell with a thickness of 200 nm, and the size of the inner nanoparticles is 50-70 nm. (see Figure 4 )

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Abstract

The invention discloses an uranium oxide micro-sphere and a preparation method, a porous structure is provided in the uranium oxide micro-sphere, and the porous structure is composed of nano particles. The invention also comprises a preparation method of the uranium oxide micro-sphere, which comprises the following steps: 1)performing a hydro-thermal reaction on a mixing aqueous solution to obtain a sea urchin-state uranium-containing micro-sphere precursor, wherein the mixing aqueous solution comprises a uranyl nitrate aqueous solution, glycerol and urea; 3)washing and drying the uranium-containing micro-sphere precursor; and 3)placing the dried uranium-containing micro-sphere precursor in a tubular furnace for pyrolysis to obtain the uranium oxide micro-sphere. The preparation method has the advantages of simple process and easy control, and the prepared uranium oxide micro-sphere has the characteristics of small size and has porous structure, and has latent application value in the relative fields of catalysis and nuclear energy.

Description

technical field [0001] The invention relates to the field of preparation of uranium oxide materials, in particular to a uranium oxide microsphere and a preparation method thereof. Background technique [0002] Due to the unique physical and chemical properties of uranium oxide, it has important applications in the fields of nuclear fuel cycle in the nuclear industry, homogeneous / heterogeneous industrial catalysis, preparation of radiation shielding materials, and research on thermoelectric materials. In recent years, the preparation and property research of uranium oxide materials has gradually entered the nanometer era, and it has been found that uranium oxide nanomaterials have significant property differences compared with their bulk materials. For example, thanks to the size reduction effect, uranium oxide materials with microscopic and nanostructures have higher catalytic efficiency for the oxidative decomposition of volatile organic pollutants; Organics categories als...

Claims

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Application Information

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IPC IPC(8): C01G43/01
Inventor 王琳石伟群赵然袁立永柴之芳
Owner INST OF HIGH ENERGY PHYSICS CHINESE ACADEMY OF SCI
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