Method for preparing porous fluorapatite ceramic adsorbing radioactive nuclide

A technology of radionuclide and fluoroapatite, which is applied in the field of porous fluoroapatite ceramics for absorbing radionuclide, can solve the problem of not having a porous structure, reducing the adsorption capacity of radionuclide, and the relatively large effect of the adsorption capacity of salt content. to achieve strong resistance to salt corrosion, promote sustainable development, and protect human health

Active Publication Date: 2016-10-26
SOUTHWEAT UNIV OF SCI & TECH
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  • Abstract
  • Description
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Problems solved by technology

First of all, due to the large amount of pore structure in zeolite and activated carbon with porous structure, it has high specific surface energy and adsorption activity, so it has strong adsorption capacity for radionuclides, but the salt content affects its adsorption capacity. In addition, although adsorption materials such as heteropolyacid salts, composite ion exchangers, and polyvalent metal phosphates have the advantages of high temperature resistance, radiation resistance, and oxidation resistance for radionuclides, such adsorption materials do not have porous properties. structure, thus reducing its adsorption capacity for radionuclides to a certain extent

Method used

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  • Method for preparing porous fluorapatite ceramic adsorbing radioactive nuclide
  • Method for preparing porous fluorapatite ceramic adsorbing radioactive nuclide
  • Method for preparing porous fluorapatite ceramic adsorbing radioactive nuclide

Examples

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Embodiment 1

[0032] A method for preparing porous fluoroapatite ceramics for absorbing radionuclides, comprising: taking the raw materials of each component according to the components and mass percentages of 50% calcium pyrophosphate, 26% calcium fluoride, and 24% calcium carbonate, and mixing them to obtain a mixture Material; according to the mass percentage of 12% of mixture, 78% of balls, and 10% of absolute ethanol, ball milling was carried out for 1 hour after weighing, and the material after ball milling was dried at 50°C for 2 hours; the dried powder was dried at 2MPa Press the pressure for 1 minute; calcinate the pressed block in a box-type resistance furnace at 750°C for 2 hours; grind the calcined block for 20 minutes, and then sieve it with a 40-mesh sieve and a 200-mesh sieve. The material and the 200 mesh sieve are the prepared fluorapatite powder; 30 weight parts of the mass percentage concentration of 1% polyethylene glycol aqueous solution and 20 weight percent of the fluo...

Embodiment 2

[0034] A method for preparing porous fluoroapatite ceramics for absorbing radionuclides, comprising: taking the raw materials of each component according to the components and mass percentages of 65% calcium pyrophosphate, 17% calcium fluoride, and 18% calcium carbonate, and mixing them to obtain a mixture Material; according to the mass percentage of 26% of the mixture, 52% of the ball, and 22% of the deionized water, the ball mill was carried out for 3 hours, and the material after the ball mill was dried at 75°C for 5 hours; the dried powder was dried at 11MPa Pressure pressing for 15 minutes; calcining the pressed block in a box-type resistance furnace at 1175°C for 7 hours; grinding the calcined block for 30 minutes, and then sieving with 100-mesh and 270-mesh sieves successively, and 100-mesh sieve Material and 270 mesh sieves are the prepared fluorapatite powder; 55 parts by weight of polyethylene glycol aqueous solution and 40% by mass concentration of 10% polyethylene ...

Embodiment 3

[0036] A method for preparing porous fluoroapatite ceramics for absorbing radionuclides, comprising: taking the raw materials of each component according to the components and mass percentages of 80% calcium pyrophosphate, 4% calcium fluoride, and 16% calcium carbonate, and mixing them to obtain a mixture Material; according to the mass percentage of 35% of mixture, 35% of grinding balls, and 30% of absolute ethanol, ball milling was carried out for 6 hours after weighing, and the material after ball milling was dried at 80°C for 8 hours; Pressure pressing for 30 minutes; calcining the pressed block in a box-type resistance furnace at 1600°C for 12 hours; grinding the calcined block for 40 minutes, and then sieving with 170-mesh and 400-mesh sieves successively. The material and the 400-mesh sieve are the obtained fluorapatite powder; 80 parts by weight of polyethylene glycol aqueous solution and 60% polyethylene glycol with a mass percentage concentration of 20% are added to 1...

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Abstract

A method for preparing porous fluorapatite ceramic adsorbing radioactive nuclide is characterized by including: using the materials in percent by weight: 50-80% of calcium pyrophosphate, 4-26% of calcium fluoride and 16-45% of calcium carbonate, and mixing, ball-milling, drying, press-forming, calcining, grinding, and screening to obtain fluorapatite powder; mixing the fluorapatite powder with polyethylene glycol solution, methyl cellulose solution and hydrogen peroxide solution, and performing microwave assisted pore-forming, drying and the like to obtain a porous fluorapatite ceramic blank; preparing porous fluorapatite ceramic adsorbing material via normal pressure sintering. The porous fluorapatite ceramic adsorbing material prepared herein has the advantages of high radiation stability, good thermal stability, high mechanical and chemical stability and the like, also has high specific surface energy and nuclide adsorbing capacity and may be used as an efficient adsorbing material for radioactive nuclide in high-radioactive waste liquid, thus effectively protecting human health and ecological environment.

Description

technical field [0001] The invention belongs to the preparation of ceramics used as radionuclide adsorption materials, and relates to a preparation method of porous fluoroapatite ceramics for absorbing radionuclide. The porous fluoroapatite ceramic prepared by the invention is especially suitable for the adsorption treatment of radionuclides in high-level radioactive waste liquid. Background technique [0002] my country has temporarily stored a certain amount of military high-level radioactive waste liquid (referred to as high-level radioactive waste liquid). It is estimated that by 2020, the installed capacity of civil nuclear power in China will reach 58 million kilowatts, and the capacity under construction will reach more than 30 million kilowatts. Power generation will accumulate tens of thousands of tons of spent fuel, and the reprocessing of spent fuel in the future will produce more high-level waste liquid; high-level waste liquid has the characteristics of strong ra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/447C04B38/00G21F9/12
CPCC04B35/447C04B38/0054C04B38/0074C04B2235/3208C04B2235/445G21F9/12
Inventor 黄毅高晓南吴浪马雪王进任雪潭张魁宝滕元成李玉香
Owner SOUTHWEAT UNIV OF SCI & TECH
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