A preparation method of porous fluoroapatite ceramics for absorbing radionuclides

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 fluorapatite ceramics for adsorbing radionuclides. The porous fluorapatite ceramic prepared by the method is particularly suitable for the adsorption treatment of radionuclides in high-level waste liquid. Background technique

[0002] China 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 China's civil nuclear power operation will reach 58 million kilowatts, and it will reach more than 30 million kilowatts under construction. By then, China's civil nuclear energy Power generation will accumulate tens of thousands of tons of spent fuel, and the post-processing of spent fuel will produce more high-level liquid waste; high-level liquid waste has the characteristics of strong...

Examples

Embodiment 1

[0032] A method for preparing porous fluoroapatite ceramics for adsorbing radionuclides is to take the raw materials of each component according to the components and mass percentages of calcium pyrophosphate 50%, calcium fluoride 26%, and calcium carbonate 24%, and mix to obtain a mixture Material; After weighing the mass percentage of 12% of the mixture, 78% of the grinding balls, and 10% of anhydrous ethanol, the ball milled for 1 hour, the ball-milled material was dried at 50°C for 2 hours; the dried powder was dried at 2MPa Press 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 use 40 mesh and 200 mesh sieve for sieving, and 40 mesh sieve The fluorapatite powder is obtained by adding 30 parts by weight of 1% polyethylene glycol aqueous solution and 20 parts by weight to 100 parts by weight of fluorapatite powder. Parts by weight of a methylcellulose aqueous solution with a con...

Embodiment 2

[0034] A preparation method of porous fluoroapatite ceramics for adsorbing radionuclides is: taking the components and mass percentages of calcium pyrophosphate 65%, calcium fluoride 17%, and calcium carbonate 18% and mixing them to obtain a mixture Material; weigh the mixture 26%, the grinding ball 52%, and the deionized water 22% mass percentage, then ball mill for 3 hours, the ball milled material is dried at 75 ℃ for 5 hours; the dried powder is 11MPa Press for 15 minutes; calcinate the pressed block in a box-type resistance furnace at 1175°C for 7 hours; grind the calcined block for 30 minutes, and then use 100 mesh and 270 mesh sieve for sieving, and 100 mesh sieve The raw material and the 270-mesh sieve are the prepared fluorapatite powder; in 100 parts by weight of fluorapatite powder, add 55 parts by weight of 10% polyethylene glycol aqueous solution and 40 parts by weight. Weight parts of methylcellulose aqueous solution with a concentration of 8% by mass, stirred for...

Embodiment 3

[0036] A method for preparing porous fluoroapatite ceramics capable of adsorbing radionuclides is to take the components and mass percentages of calcium pyrophosphate 80%, calcium fluoride 4%, and calcium carbonate 16%, and mix them. Material; After weighing the mixture 35%, grinding ball 35%, 30% absolute ethanol, ball milling for 6 hours, the ball milled material is dried at 80 ℃ for 8 hours; the dried powder is 20MPa 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 sieve successively, and 170 mesh under the sieve The raw material and the 400 mesh sieve are the prepared fluoroapatite powder; in 100 parts by weight of fluoroapatite powder, 80 parts by weight of 20% polyethylene glycol aqueous solution and 60% by weight are added. Part by weight of methyl cellulose aqueous solution with a concentration of 15% by weight was stirred ...

Technical field

[0001] The invention belongs to the preparation of ceramics used as radionuclide adsorption materials, and relates to a preparation method of porous fluorapatite ceramics for adsorbing radionuclides. The porous fluorapatite ceramic prepared by the method is particularly suitable for the adsorption treatment of radionuclides in high-level waste liquid. Background technique

[0002] China 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 China's civil nuclear power operation will reach 58 million kilowatts, and it will reach more than 30 million kilowatts under construction. By then, China's civil nuclear energy Power generation will accumulate tens of thousands of tons of spent fuel, and the post-processing of spent fuel will produce more high-level liquid waste; high-level liquid waste has the characteristics of strong...

Examples

Embodiment 1

[0032] A method for preparing porous fluoroapatite ceramics for adsorbing radionuclides is to take the raw materials of each component according to the components and mass percentages of calcium pyrophosphate 50%, calcium fluoride 26%, and calcium carbonate 24%, and mix to obtain a mixture Material; After weighing the mass percentage of 12% of the mixture, 78% of the grinding balls, and 10% of anhydrous ethanol, the ball milled for 1 hour, the ball-milled material was dried at 50°C for 2 hours; the dried powder was dried at 2MPa Press 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 use 40 mesh and 200 mesh sieve for sieving, and 40 mesh sieve The fluorapatite powder is obtained by adding 30 parts by weight of 1% polyethylene glycol aqueous solution and 20 parts by weight to 100 parts by weight of fluorapatite powder. Parts by weight of a methylcellulose aqueous solution with a con...

Embodiment 2

[0034] A preparation method of porous fluoroapatite ceramics for adsorbing radionuclides is: taking the components and mass percentages of calcium pyrophosphate 65%, calcium fluoride 17%, and calcium carbonate 18% and mixing them to obtain a mixture Material; weigh the mixture 26%, the grinding ball 52%, and the deionized water 22% mass percentage, then ball mill for 3 hours, the ball milled material is dried at 75 ℃ for 5 hours; the dried powder is 11MPa Press for 15 minutes; calcinate the pressed block in a box-type resistance furnace at 1175°C for 7 hours; grind the calcined block for 30 minutes, and then use 100 mesh and 270 mesh sieve for sieving, and 100 mesh sieve The raw material and the 270-mesh sieve are the prepared fluorapatite powder; in 100 parts by weight of fluorapatite powder, add 55 parts by weight of 10% polyethylene glycol aqueous solution and 40 parts by weight. Weight parts of methylcellulose aqueous solution with a concentration of 8% by mass, stirred for...

Embodiment 3

[0036] A method for preparing porous fluoroapatite ceramics capable of adsorbing radionuclides is to take the components and mass percentages of calcium pyrophosphate 80%, calcium fluoride 4%, and calcium carbonate 16%, and mix them. Material; After weighing the mixture 35%, grinding ball 35%, 30% absolute ethanol, ball milling for 6 hours, the ball milled material is dried at 80 ℃ for 8 hours; the dried powder is 20MPa 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 sieve successively, and 170 mesh under the sieve The raw material and the 400 mesh sieve are the prepared fluoroapatite powder; in 100 parts by weight of fluoroapatite powder, 80 parts by weight of 20% polyethylene glycol aqueous solution and 60% by weight are added. Part by weight of methyl cellulose aqueous solution with a concentration of 15% by weight was stirred ...

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