A kind of chemical stability evaluation method of fluoroapatite ceramic solidified body

A technology of chemical stability and ceramic solidification, which is applied in color/spectral characteristic measurement, thermal excitation analysis, material excitation analysis, etc., and can solve problems such as unreported and lack of experimental basis

Active Publication Date: 2018-06-08
SOUTHWEAT UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, for the simulated deep geological disposal environment (temperature 100-200°C, pressure 0.101-1.554MPa, pH 5-9), the fluoroapatite ceramic solidified body is under the coupling action of "heat, water, force, and chemistry" multi-factors The chemical stability of fluoroapatite ceramics has not been reported at home and abroad; for the chemical stability of fluorapatite ceramic solidified body in deep geological disposal environment, there is still a lack of experimental basis and suitable evaluation methods.

Method used

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  • A kind of chemical stability evaluation method of fluoroapatite ceramic solidified body

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] with Ca 2 P 2 o 7 , CaF 2 、Sm 2 o 3 As raw material, according to the chemical formula Ca 9.85 SM 0.1 (PO 4 ) 6 f 2Weigh the raw materials of each component for batching, according to the batching: grinding ball: absolute ethanol or / and water at a mass percentage of 35:15:50, mix them in a planetary ball mill and grind for 2 hours, and the obtained mixture is dried, The dried powder can be obtained, add polyvinyl alcohol sol of 3% of the dried powder mass, and then use a sieve to mix and granulate. Material; put the granulated material into a steel mold, press and form it with a pressure of 8 MPa on a hydraulic press, and then perform cold isostatic pressing on a cold isostatic press with a pressure of 80 MPa to obtain a molded green body; at 400 ° C Heat-treat the molded green body at high temperature for 5 hours for debinding, then put the degummed green body into a vacuum hot-press sintering furnace, and carry out vacuum hot-press sintering at a temperature...

Embodiment 2

[0035] with Ca 2 P 2 o 7 , CaF 2 、Sm 2 o 3 As raw material, according to the chemical formula Ca 7.75 SM 1.5 (PO 4 ) 6 f 2 Weigh the raw materials of each component for batching, according to the batching: grinding ball: absolute ethanol or / and water at a mass percentage of 55:25:20, mix them in a planetary ball mill and grind for 3 hours, and the obtained mixture is dried, The dried powder can be obtained, add polyvinyl alcohol sol with a mass of 6% of the dried powder, and then use a sieve to mix and granulate. Material; put the granulated material into a steel mold, press and form it with a pressure of 21 MPa on a hydraulic press, and then perform cold isostatic pressing on a cold isostatic press with a pressure of 170 MPa to obtain a molded green body; at 500 ° C The molded green body is heat-treated at high temperature for 7 hours for debinding, and then the degummed green body is put into a vacuum hot-pressing sintering furnace, and vacuum hot-pressing sinterin...

Embodiment 3

[0037] with Ca 2 P 2 o 7 , CaF 2 、Sm 2 o 3 As raw material, according to the chemical formula Ca 5.5 SM 3 (PO 4 ) 6 f 2 Weigh the raw materials of each component for batching, according to the batching: grinding ball: absolute ethanol or / and water in a mass percentage of 65:20:15, mix them in a planetary ball mill and grind for 5 hours, and the obtained mixture is dried. The dried powder can be obtained, add polyvinyl alcohol sol with a mass of 10% of the dried powder, and then use a sieve to mix and granulate. Material; put the granulated material into a steel mold, press and form it on a hydraulic press with a pressure of 35 MPa, and then perform cold isostatic pressing on a cold isostatic press with a pressure of 260 MPa to obtain a molded green body; at 600 ° C The molded green body is heat-treated at high temperature for 10 hours for debinding, and then the degummed green body is put into a vacuum hot-pressing sintering furnace, and vacuum hot-pressing sintering...

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Abstract

The invention discloses a method for evaluating the chemical stability of a fluoroapatite ceramic solidified body, which is characterized in that: the simulated minor actinide nuclide fluoroapatite ceramic solidified body is prepared; the outer shell is made of stainless steel, and the inner lining is made of polytetrafluoroethylene The ethylene hydrothermal reaction kettle is used as the leaching container; the deionized water is used as the leaching agent, and the pH value is adjusted to 5-9; the leaching is carried out at a temperature of 100-200°C and a pressure of 0.101-1.554MPa, and the conductivity of the leachate is tested and analyzed. The concentration of ions in the medium, the calculation of the normalized leaching rate of the simulated minor actinide nuclides, the analysis of the phase change of the solidified body before and after leaching, and the evaluation of the fluorapatite ceramic solidified body under the coupling effects of "heat, water, force, and chemistry" chemical stability. The invention is simple and practical, has strong operability, reasonable and intuitive evaluation indicators, and accurate and reliable evaluation results, and can provide effective experimental basis and technical support for evaluating the long-term stability and safety of solidified high-level radioactive waste in deep geological disposal environments.

Description

technical field [0001] The invention belongs to the treatment and disposal of high-level radioactive waste (abbreviated as high-level radioactive waste), and relates to a chemical stability evaluation method of fluorapatite ceramic solidified body. It is applicable to the chemical stability evaluation of the solidified minor actinide high-level radioactive waste under the multi-factor coupling action of "thermal field, water flow field, force field and chemical field" in the deep geological disposal environment. Background technique [0002] With the increasing demand for energy in human society, the depletion of traditional fossil fuels and the gradual increase in the requirements for greenhouse gas emission control, human beings will have to face the choice of alternative energy sources. As a safe, clean 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 h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/31G01N21/71
Inventor 黄毅高晓南王进任雪潭张魁宝吴浪滕元成李玉香
Owner SOUTHWEAT UNIV OF SCI & TECH
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