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Geological cement for solidification of radioactive distillation raffinate and its solidification method

A curing method and technology for evaporating residual liquid are applied in the field of geological cement for curing radioactive residual liquid and its curing, which can solve the problems of high cost, complicated process and insignificant effect.

Active Publication Date: 2017-03-29
深圳市航天新材科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these operations can partially increase the waste liquid containment capacity and reduce the impact of boron on the performance of the solidified body, the process is complicated and the cost is high
In addition, some literatures use coagulants to reduce the influence of boron on the setting time of cement solidified body, but when the boron content is too high, the effect is not obvious

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 94% blast furnace slag, 6% fly ash, grind together to prepare slag powder, powder specific surface area 450kg / m 3 . The percentage of each component in the composite mineral activator is: 52% SiO 2 , 28%Na 2 O, 20%Na 2 CO 3 . The percentages of each component in the adsorbent are: 60% of sodium bentonite and 40% of zeolite. Take 65 parts by weight of slag powder, 18 parts by weight of composite mineral activator, and 17 parts by weight of adsorbent and mix uniformly to prepare geological cement. The mass ratio of the concentrated waste liquid to the geological cement is 0.91, and the cement and the waste liquid are stirred in a stirring pot for 7 minutes, and then transferred to a mold of φ50×50mm to prepare a solidified body. Put the test mold into the curing box for curing, the curing temperature is 20±1°C, and the relative humidity is ≥90%. 17.0MPa; after soaking for 90 days, the cured body has no cracks on the surface, and the compressive strength is 27.5MPa....

Embodiment 2

[0025] 94% blast furnace slag, 6% fly ash, grind together to prepare slag powder, powder specific surface area 450kg / m 3 . The percentage of each component in the composite mineral activator is: 52% SiO 2 , 28%Na 2 O, 20%Na 2 CO 3 . The percentages of each component in the adsorbent are: 50% of sodium bentonite and 50% of kaolin. Take 65 parts by weight of slag powder, 18 parts by weight of composite mineral activator, and 17 parts by weight of adsorbent and mix uniformly to prepare geological cement. The mass ratio of the concentrated waste liquid to the geological cement is 0.91, and the cement and the waste liquid are stirred in a stirring pot for 7 minutes, and then transferred to a mold of φ50×50mm to prepare a solidified body. Put the test mold into the curing box for curing, the curing temperature is 20±1°C, and the relative humidity is ≥90%. 17.0MPa; after soaking for 90 days, the cured body has no cracks on the surface, and the compressive strength is 22.0MPa. ...

Embodiment 3

[0027] 75% blast furnace slag, 10% fly ash, 15% steel slag, grind together to prepare slag powder, powder specific surface area 480kg / m 3 . The percentage of each component in the composite mineral activator is: 40% SiO 2 , 38%Na 2 O, 12% CaO, 10% Na 2 CO 3 . The percentages of each component in the adsorbent are: 60% of sodium bentonite and 40% of zeolite. Take 75 parts by weight of slag powder, 15 parts by weight of composite mineral activator, and 10 parts by weight of adsorbent and mix uniformly to prepare geological cement. The mass ratio of concentrated waste liquid to geological cement is 0.89, and the cement and waste liquid are stirred in a stirring pot for 7 minutes, and then transferred to a mold of φ50×50mm to prepare a solidified body. Put the test mold into the curing box for curing, the curing temperature is 20±1°C, and the relative humidity is ≥90%. 15.0MPa; after soaking for 90 days, the cured body has no cracks on the surface, and the compressive stren...

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Abstract

Provided is a new geological cement material and a method for the solidification thereof, belonging to the technical domain of radioactive evaporation residue solidification. The method involves preparing a geological cement by means of uniformly mixing aluminosilicate-containing slag, a compound mineral activator, and a sorbent. The geological cement is then mixed with concentrated liquid wastes and stirred for 7 minutes in an agitation vessel, then transferred to a mold for curing. When using same to solidify liquid radioactive evaporation residues, the dry salt content whereof is as high as 345g / l, the liquid evaporation residue content of the solidified form is as high as 80%, the setting time is adjustable and terminable within 24 hours, and the initial setting period is sure to be suitable for performing solidification operations. After curing for 28 days, all indicators of the solid form exceed the requirements of the "National Performance Requirements for Low- and Intermediate-Level Radioactive Waste Forms － Cemented Waste Form". Compressive strength exceeds 15Mpa and leaching rate of 137Cs at 42d is 1.0×10 -3cm / d, 4 times lower than the national standard.

Description

technical field [0001] The invention belongs to the technical field of radioactive distillate solidification, and in particular relates to a geological cement for radioactive distillate solidification and a curing method thereof. Background technique [0002] Evaporation technology is one of the main methods for the treatment of radioactive waste liquid, especially nuclear power plant radioactive waste liquid. Through evaporation treatment, the volume of waste liquid can be greatly reduced. However, most of the radionuclides are enriched in the waste liquid after evaporation treatment, which needs to be solidified before final disposal. Cement solidification of medium and low radioactive waste has the advantages of simple process, low cost, good thermal stability and radiation resistance of the solidified body, high mechanical strength, and no secondary waste. 0.5~1.0), and the leaching rate is relatively high. Especially when solidifying boron-containing concentrated wast...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G21F9/16C04B28/06
CPCC04B28/06G21F9/16
Inventor 翁履谦曹海琳郭悦李国学李绍彬
Owner 深圳市航天新材科技有限公司
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