Boron-containing waste resin cement curing formula and curing method thereof

A cement solidification and waste resin technology, applied in radioactive purification, nuclear engineering, etc., can solve the problems of high nuclide leaching rate and low waste containment rate, and achieve the effect of improving the containment rate and meeting the requirements of automatic loading and unloading.

Pending Publication Date: 2021-03-12
CNNC NUCLEAR POWER OPERATION MANAGEMENT +2
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  • Summary
  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Based on this, it is necessary to provide a boron-containing waste resin cement curing formula and curing method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A kind of boron-containing waste resin cement solidification formula, comprises ordinary Portland cement, lime, molecular sieve, additive, waste resin and water, and the weight ratio of described ordinary Portland cement, lime, molecular sieve, additive, waste resin and water is 1:0.06~0.1:0.04~0.08:0.36:0.01~0.04:0.22~0.32.

[0027] Wherein: the strength grade of the ordinary Portland cement is 42.5, 3-day compressive strength ≥ 17Mpa, 28-day compressive strength ≥ 42.5Mpa, 3-day flexural strength ≥ 3.5Mpa, 28-day flexural strength ≥ 6.5Mpa.

[0028] The ordinary Portland cement is a hydraulic cementitious material made of Portland cement clinker, 5%-20% mixed materials and an appropriate amount of gypsum.

[0029] Ca (OH) in the lime Purity ≥ 95%, described lime is used for neutralizing the boric acid that waste resin is adsorbed, reduces the retarding action of boric acid to cement, lime consumption is adjusted according to boric acid content, as boric acid content i...

Embodiment 2

[0038] The solidification formula of boron-containing waste resin cement in Example 1 is subjected to laboratory cold test verification and thermal test verification to verify whether the formula performance meets GB14569.1 "Performance Requirements for Low and Medium Level Radioactive Waste Solidified Body-Cement Solidified Body" and GB7023 " Long-term leaching test of solidified radioactive waste" requirements.

[0039] 1. Properties of cement slurry: The cement slurry in Example 1 has moderate consistency, low fluidity, no bleeding after 3 hours, and the sample hardens after 22 hours.

[0040] 2. Compressive strength: The compressive strength of the mud solidified body sample should not be less than 7MPa. In this experiment, six groups of cement solidified bodies of Example 1 were used for compressive strength experiments. The experimental results showed that the 28-day average compressive strength was 35.0 MPa, meeting the standard requirements.

[0041] 3. Soak resistanc...

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Abstract

The invention particularly relates to a boron-containing waste resin cement curing formula and a curing method thereof, the boron-containing waste resin cement curing formula comprises ordinary Portland cement, lime, a molecular sieve, an additive, waste resin and water, and the weight ratio of the ordinary Portland cement to the lime to the molecular sieve to the additive to the waste resin to the water is 1: 0.06-0.1: 0.04-0.08: 0.36: 0.01-0.04: 0.22-0.32. The formula is suitable for curing the boron-containing waste resin, and has the remarkable characteristics that the curing volume containing rate of the waste resin is increased and reaches 49%; molecular sieves are added into the formula and used for adsorbing radionuclides so that the leaching rate of the radionuclides is reduced; PO42.5 cement is adopted as a curing base material, local supply of PO42.5 cement is achieved, bulk cement can be provided, and the automatic loading and unloading requirements of a cement curing system are met.

Description

technical field [0001] The invention belongs to the technical field of nuclear power plant radioactive waste treatment, and in particular relates to a formula for fixing radioactive solid waste cement slurry and a curing method thereof. Background technique [0002] During the operation of nuclear power plants, a large amount of waste resin will be produced. In order to prevent the waste resin from harming the human environment, it must be solidified to make it easy to transport and store, and then stored in the radioactive solid waste disposal site for a long time to ensure radioactivity. The safe isolation of solid waste from the environment. After 300-500 years of natural decay, the radioactive level of radionuclides is reduced to an acceptable level and no longer endangers the environment. [0003] Cement solidification is a relatively safe solidification method. Its principle is to use cement as the inorganic gel material, mix cement, radioactive waste, water and other ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/12G21F9/30
CPCC04B28/12G21F9/304C04B2111/00017C04B7/02C04B2103/302C04B18/20C04B22/00C04B22/08C04B22/0046
Inventor 余达万闫晓俊周辰昊郭喜良徐宏明杨永亮朱昌荣谢秀娟刘列姜春辉余达宇欧阳涛赵凯平
Owner CNNC NUCLEAR POWER OPERATION MANAGEMENT
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