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Method of preparing ceramic grade uranium dioxide ball

A technology of uranium dioxide and ceramic grade, which is applied in the field of nuclear material manufacturing technology, can solve the problems that affect the popularization and application of UO2 balls, the purity cannot be guaranteed, and the operation process is complicated, etc., and achieve the effect of easy realization, high purity, and convenient operation

Inactive Publication Date: 2015-03-25
NUCLEAR POWER INSTITUTE OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Currently preparing UO 2 When balling, the operation process is complicated, and more impurities are introduced, UO 2 The purity of the ball cannot be guaranteed and this will affect the UO 2 Popularization and application of spheres in the field of nuclear technology

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A method for preparing ceramic-grade uranium dioxide balls comprises the following five steps in sequence: preparation of slurry, dispersion and gelation, washing, drying and calcination and reduction sintering. The specific process of slurry preparation is: the U 3 o 8 Weigh 50.4g of powder and add water ball mill for 2h to get U 3 o 8 Slurry, U in the slurry after ball milling 3 o 8 The powder average size is 0.2 μm. Will U 3 o 8 The slurry was placed in a constant temperature environment of 10°C, and when the temperature dropped below 10°C, 12 grams of urea, 28 grams of urotropine, and 1.1 g of ammonium citrate were added, and stirred evenly to obtain a polymer slurry.

[0032] The specific process of dispersion and gelation is: add the polymer slurry into the vibration dispersion device, the vibration dispersion device has an orifice plate with three holes evenly distributed, start the vibration dispersion device until the internal dispersion pressure is 0.15...

Embodiment 2

[0036] A method for preparing ceramic-grade uranium dioxide balls comprises the following five steps in sequence: preparation of slurry, dispersion and gelation, washing, drying and calcination and reduction sintering. The specific process of slurry preparation is: the U 3 o 8 Powder weighed 33.6g and ball milled for 3h to get U 3 o 8 Powder, after ball milling U 3 o 8 The powder average size was 0.18 μm. In a constant temperature environment at 10°C, prepare a pre-polymerization solution with water / acrylamide / N,N-methylenebisacrylamide in a ratio of 100 / 15 / 1, and add U 3 o 8 powder and stir evenly to obtain a polymer slurry, add 1% ammonium persulfate of the total weight of both acrylamide and N,N-methylenebisacrylamide, and add U3 o 8 2% ammonium citrate by powder weight, of which, U 3 o 8 The content in the polymer slurry is 45wt%.

[0037] The specific process of dispersing and gelling is as follows: add the polymer slurry into the vibration dispersing device, th...

Embodiment 3

[0041] A method for preparing ceramic-grade uranium dioxide balls comprises the following five steps in sequence: preparation of slurry, dispersion and gelation, washing, drying and calcination and reduction sintering. The specific process of slurry preparation is: the U 3 o 8 Powder weighed 54.0g and ball milled for 8h to get U 3 o 8 Powder, after ball milling U 3 o 8 The powder average size is 0.27 μm. In a constant temperature environment at 10°C, prepare a pre-polymerization solution with water / acrylamide / N,N-methylenebisacrylamide in a ratio of 100 / 20 / 1.5, and add U 3 o 8 powder and stir evenly to obtain a polymer slurry, add acrylamide and N,N-methylenebisacrylamide both of the total weight of 0.8% ammonium persulfate, and add U 3 o 8 2.5% ammonium polyacrylate by powder weight, where, U 3 o 8 The content in the polymer slurry is 55wt%.

[0042] The specific process of dispersion and gelation is: put the polymer slurry into the syringe, slowly spray the slurry...

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Abstract

The invention discloses a method of preparing a ceramic grade uranium dioxide ball. The method sequentially comprises the following steps: carrying out ball milling on uranium oxide, wherein the particle size of the uranium oxide after ball milling is 0.1-0.3 micron; adding the uranium oxide into a polymer monomer, and uniformly stirring to obtain polymer slurry; producing slurry drops by virtue of the polymer slurry; adding the slurry drops into a dispersion column which contains heated carbon tetrachloride or liquid paraffin, and descending the slurry drops to obtain a green body ball in the dispersion column under the surface tension, wherein the temperature in the dispersion column is 80-90 DEG C; washing the green body ball by adopting an ethanol solution; drying the green body ball, and removing an organic matter on the surface of the green body ball to obtain a dry calcined ball; and carrying out reduction sintering on the dry calcined ball in a hydrogen atmosphere to obtain the ceramic grade UO2 ball. The method is simple in whole process, convenient in realization, small in introduced impurities, high in purity of the prepared UO2 ball and beneficial to popularizing and applying the UO2 ball in the field of nuclear technology.

Description

technical field [0001] The invention relates to a nuclear material manufacturing process, in particular to a method for preparing ceramic grade uranium dioxide balls. Background technique [0002] In the field of nuclear technology, UO 2 Balls have different uses according to different sizes, among them, in the field of nuclear technology, UO with a diameter of 0.5 ~ 3mm 2 Balls are the most widely used, such as: UO with a diameter of 0.5mm 2 Balls can be used as fuel for high temperature gas-cooled reactors, UO with a diameter of 0.8~1.0mm 2 Balls can be used in the development of neutron detectors. Currently preparing UO 2 When balling, the operation process is complicated, and more impurities are introduced, UO 2 The purity of the ball cannot be guaranteed and this will affect the UO 2 The promotion and application of balls in the field of nuclear technology. Contents of the invention [0003] The purpose of the present invention is to overcome the deficiencies o...

Claims

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Application Information

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IPC IPC(8): C04B35/51C04B35/622C04B35/634
Inventor 汪新杰尹荣才刘锦洪卢长先李佳周劲松
Owner NUCLEAR POWER INSTITUTE OF CHINA
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