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Geological cement for radioactive steam residual liquid solidifying and solidifying method thereof

A solidification method and technology of steaming raffinate, which is applied in the field of geological cement for solidification of radioactive distillation raffinate and its curing field, and can solve the problems of complex process, ineffective effect and high cost

Active Publication Date: 2015-01-14
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

The invention provides geological cement for radioactive steam residual liquid solidifying and a solidifying method thereof. The solidifying method includes mixing slag containing aluminosilicate, a compound mineral activator and an absorbent well to prepare the geological cement; stirring the geological cement and concentrated waste liquid in a stirring pan for 7min; transferring a mixture of the geological cement and the concentrated waste liquid into a die for curing. When the method is used to solidify radioactive steam residual liquid, dry salt content of the steam residual liquid is up to 345g / L, the steam residual liquid contained in a solidified body reaches 80%, condensing time is adjustable, final setting time is smaller than 24h, and proper initial setting time is ensured for solidifying operation. After 28h of curing, each indicator of the solidified body is superior to regulations of 'National Requirements on Performance of Low-Medium-Level Radioactive Waste Solidified Bodies-Cement Solidified Bodies', wherein compressive strength is up to more than 15Mpa, and 137Cs 42-th element leaching efficiency is 1.0x10-3cm / d and is lower than the national standard by four times.

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 Applications(China)
IPC IPC(8): G21F9/16C04B28/06
CPCC04B28/06G21F9/16G21F9/165
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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