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A kind of preparation method of fluorapatite ceramic solidified body

A technology of ceramic solidification and fluoroapatite, which is applied in the field of preparation of solidified radioactive waste, can solve the problems of reduced stability of vitrified solidified bodies, poor thermodynamic stability, devitrification or crystallization, etc., to protect human health and ecology Environment, high chemical stability and thermal stability, effect of promoting sustainable development

Active Publication Date: 2017-03-01
SOUTHWEAT UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Yet borosilicate glass solidified body has following three deficiencies: the one, the solid solubility of minor actinide nuclides (Np, Am, Cm) in borosilicate glass is very low, only about 0.4wt% The second is that the high-level waste liquid contains up to 15wt% phosphorus (in P 2 o 5 ), and the solid solubility of phosphorus in borosilicate glass is also very low, only about 2-3wt%. phase, its thermodynamic stability is poor, and it is prone to devitrification or crystallization, resulting in an increase in the leaching rate of nuclides in the vitrified body and a decrease in the stability of the vitrified body

Method used

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  • A kind of preparation method of fluorapatite ceramic solidified body
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  • A kind of preparation method of fluorapatite ceramic solidified body

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Embodiment 1

[0034] A preparation method of fluorapatite ceramic solidified body, the steps are: according to the mass percentage of 50.69% of calcium pyrophosphate, 20.62% of calcium fluoride, and 28.69% of samarium oxide, the raw materials of each component are weighed, and after mixing evenly, a mixture is obtained ; According to the mass percentages of 40% of the mixture, 20% of the grinding balls, 20% of absolute ethanol, and 20% of deionized water, the mixture, the grinding balls, and the absolute ethanol were added to the planetary ball mill for grinding for 3 hours, and then the grinding The subsequent ingredients are dried at 60°C for 4 hours to obtain dried powder; add polyvinyl alcohol sol with 5% of the dried powder mass to the dried powder, mix and granulate, and then successively After sieving with 15-mesh and 180-mesh sieves, the 15-mesh sieve and the 180-mesh sieve are the prepared granulated materials; the granulated materials are put into steel molds, and the pressure of 1...

Embodiment 2

[0036] A preparation method of fluorapatite ceramic solidified body, the steps are: according to the mass percentage of calcium pyrophosphate 39.88%, calcium fluoride 25.45%, and samarium oxide 34.67%, the raw materials of each component are weighed, and after mixing evenly, a mixture is obtained ; According to the mass percentage of 35% of the mixture, 15% of the grinding balls, and 50% of absolute ethanol, the mixture, the grinding balls, and the absolute ethanol were added to the planetary ball mill for grinding for 2 hours, and then the ingredients after grinding were ground at 40°C Dry at a temperature of 6 hours to obtain the dried powder; add polyvinyl alcohol sol with a mass of 3% of the dried powder to the dried powder, mix and granulate, and then successively use 12 mesh and 170 mesh After the sieve is screened, the 12-mesh sieve material and the 170-mesh sieve material are the prepared granulated material; the granulated material is put into a steel mold, and the pre...

Embodiment 3

[0038] A method for preparing a fluorapatite ceramic solidified body, the steps are: weighing the raw materials of each component according to the mass percentage of calcium pyrophosphate 75.12%, calcium fluoride 13.65%, and samarium oxide 11.23%, and mixing them uniformly to obtain a mixture ;According to the mass percentage of 65% of the mixture, 30% of the grinding balls, and 5% of deionized water, the mixture, the grinding balls, and the deionized water were added to the planetary ball mill for grinding for 5 hours, and then the ingredients after grinding were heated at 80°C Dry at a temperature of 3 hours to obtain the dried powder; add polyvinyl alcohol sol with a mass of 10% of the dried powder to the dried powder, mix and granulate, and then successively use 25 mesh and 270 mesh After the sieve is screened, the 25-mesh sieve material and the 270-mesh sieve material are the prepared granulated material; the granulated material is put into a steel mold, and the pressure o...

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Abstract

The present invention discloses a method for preparing a fluorapatite ceramic solidified body. The method is characterized by comprising the steps of: taking and mixing 23-76 wt.% of calcium pyrophosphate, 8-26 wt.% of calcium fluoride, 0. 02-52wt.% of samarium oxide (europium oxide, gadolinium oxide), 0-15 wt.% of sodium carbonate, 0-16 wt.% of silica to obtain a mixture; grinding, drying, granulating, molding, discharging rubber and conducting vacuum hot pressing sintering on the mixture to obtain a fluorapatite ceramic solidified body. The method not only utilizes the phosphorus in high-level radioactive waste in a recycling way, but also can address the problem of low solubility of phosphorus and minor actinides nuclide in glass solidified body. The fluorapatite ceramic cured body prepared by the invention has excellent preparation geological stability, irradiation stability, mechanical stability, chemical stability and thermal stability, and can be used as a ceramic solidified body for safe treatment of minor actinides high-level radioactive waste with high toxicity, long half-life period and strong radioactivity.

Description

technical field [0001] The invention belongs to the preparation of radioactive waste solidified body, and relates to a preparation method of fluorapatite ceramic solidified body. The fluorapatite ceramic solidified body prepared by the invention is especially suitable for ceramic solidification treatment of minor actinide high-level radioactive waste. Background technique [0002] In order to meet the ever-increasing energy needs of economic and social development, human beings use a large amount of fossil fuels such as coal and petroleum. Extensive consumption has led to the depletion of fossil energy on the earth. Therefore, mankind will face the choice of subsequent alternative energy sources. As a clean, safe and economical energy, nuclear energy is expected to replace traditional fossil energy on a large scale and is an indispensable energy for the sustainable development of human society. However, while the development and utilization of nuclear energy has brought h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/447C04B35/622
Inventor 黄毅高晓南张魁宝王进吴浪马雪滕元成李玉香
Owner SOUTHWEAT UNIV OF SCI & TECH
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