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Method for solidifying radioactive boron-containing residual distillate by Portland cement

A portland cement and radioactive technology, which is applied in the field of radioactive waste treatment, can solve the problems of complex operation steps and high cost, meet the compressive strength and nuclide leaching rate, and improve the effect of waste containment capacity and compressive strength

Inactive Publication Date: 2011-10-05
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The steps of these processes are complex and costly

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Mix 1000g of Portland cement, 50g of zeolite, 110g of lime, 3g of water reducer, and 2g of durafiber evenly, stir with 0.45L of radioactive boron-containing steamed raffinate in a stirring pot for 3 minutes, and move it into a mold of Φ50mm×50mm. Curing for 28 days, the curing temperature is 25±5°C, and the relative humidity is ≥90%, and it is made into a cured body. Calculate the total volume of the solidified body and use it to calculate the waste inclusion capacity in the solidified body, and obtain a value of 63%.

Embodiment 2

[0014] Mix 1000g of Portland cement, 50g of zeolite, 110g of lime, 3g of water reducer, and 2g of durafiber evenly, stir with 0.45L of radioactive boron-containing steamed raffinate in a stirring pot for 3 minutes, and move it into a mold of Φ50mm×50mm. Curing for 28 days, the curing temperature is 25±5°C, and the relative humidity is ≥90%, and it is made into a cured body. The upper and lower surfaces of the cured body are properly polished with sandpaper to keep the upper and lower surfaces parallel, and then the unconfined compressive strength is measured on a pressure testing machine. The measured 28d compressive strength is 37.3MPa.

Embodiment 3

[0016] Mix 1000g of Portland cement, 45g of zeolite, 110g of lime, 10g of water reducing agent, and 3g of durafiber evenly, stir with 0.48L of radioactive boron-containing steamed raffinate in a stirring pot for 3 minutes, and move it into a mold of Φ50mm×50mm. Curing for 28 days, the curing temperature is 25±5°C, and the relative humidity is ≥90%, and it is made into a cured body. The waste inclusion capacity and 28d compressive strength values ​​of the cured body are 63% and 35.2MPa respectively.

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Abstract

The invention discloses a method for solidifying radioactive boron-containing residual distillate by Portland cement, and belongs to the technical field of radioactive waste treatment. The method comprises the following steps of: mixing the Portland cement, zeolite, lime, a water reducing agent and Durafiber uniformly; stirring the mixture and the radioactive boron-containing residual distillate for 3 minutes in a stirring boiler; and transferring the stirred mixture into a mould with the specification of phi 50mm*50mm and curing for 28 days to obtain a solidified body. By the method for solidifying the radioactive boron-containing residual distillate, the waste capacity and the compressive strength of the solidified body are improved, and the compressive strength and the nuclide leachingrate of the solidified body meet the national standard.

Description

technical field [0001] The invention belongs to the technical field of radioactive waste treatment, and in particular relates to a method for solidifying radioactive boron-containing distillation raffinate with Portland cement. Background technique [0002] During the operation of the pressurized water reactor nuclear power plant, boric acid needs to be added to the primary circuit to control the reaction rate, and a large amount of boric acid solution will be added to the core during refueling or maintenance to ensure safety. When it is no longer needed, the boron solution is flushed out with deionized water, resulting in radioactive boron-containing waste liquid. These boron-containing waste liquids are often concentrated before solidification to reduce the volume of the solidified body. A 1 million-kilowatt pressurized water reactor nuclear power plant discharges about 132m per year 3 0.7% boron-containing waste liquid or 23m 3 Boron 4% distilled raffinate. How to eff...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G21F9/16G21F9/04
CPCC04B28/04C04B2111/00767Y02W30/91C04B14/047C04B16/0633C04B18/0463C04B22/064C04B2103/30
Inventor 王建龙孙奇娜李俊峰
Owner TSINGHUA UNIV
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