Solidification method of radioactive waste residues

A solidification method and radioactive technology, which is applied in the solidification field of radioactive waste residue, can solve problems such as difficulty in adapting to solidification needs, large cement content, and low containment capacity, and achieve low leaching rate, high reactivity, and reduced porosity.

Active Publication Date: 2020-04-24
NANHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the amount of cement in the formula is about 3 times that of waste resin, and the containment capacity is still relatively low, and the cost is high; and the solidified body described in this method is designed for waste resin, and the amount of cement is large, which is only suitable for small volumes. Solidification, it is difficult to meet the solidification needs of a large amount of radioactive waste such as slag and tailings

Method used

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  • Solidification method of radioactive waste residues
  • Solidification method of radioactive waste residues
  • Solidification method of radioactive waste residues

Examples

Experimental program
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Effect test

Embodiment 1

[0046] In this embodiment, slag from a uranium mine in Hunan is taken as a sample, and the sample is 0-300mm gangue.

[0047] Follow the steps below to solidify the sample to obtain a cement solidified body:

[0048] S1. Waste slag crushing: Before crushing, first dry the slag sample to a moisture content of 3.6wt%, and then use a jaw crusher to crush the slag into slag with a particle size of 0-5mm, which is an unselected particle size. continuous grading;

[0049] S2. Mixing ingredients: choose ordinary Portland cement with a strength grade of 52.5, use "activated clay and fly ash with a mass ratio of 1:2" as the functional filler, and the content of the functional filler with a particle size of less than 0.075mm is greater than 95 %, the mass ratio of slag, functional filler and cement is 70:15:15, and the mixture is obtained by stirring and mixing evenly;

[0050] S3. Acidified water glass: select brand LGY402, the liquid sodium silicate (water glass) that modulus is 3.2...

Embodiment 2

[0058] In this embodiment, leaching slag from a water treatment plant of a uranium mine in Hunan is taken as a sample, the particle size of the sample is 0-1.0mm, and the water content is 8%-15%.

[0059] Follow the steps below to solidify the sample to obtain a cement solidified body:

[0060] S1. Waste slag crushing: before crushing, spread the leaching slag to a thickness of 10mm-20mm, dry at 100-105°C for 2 hours, and then use a ball mill to disperse the leaching slag into broken slag;

[0061] S2. Mixing of ingredients: Ordinary Portland cement with a strength grade of 52.5 is selected, and "the mass ratio of activated clay, fly ash and granulated blast furnace slag powder is 1:1:1" is used as the functional filler, and the particle size of the functional filler is The content of less than 0.075mm is greater than 95%. The mass ratio of slag, functional filler and cement is 65:20:15 for batching, and the mixture is obtained by stirring and mixing evenly;

[0062] S3. Acid...

Embodiment 3～11

[0066] Compared with Example 1, Examples 3-11 differ in that the preparation conditions are shown in Table 3, and the others are basically the same as Example 1, and will not be repeated here.

[0067] The preparation condition of table 3 embodiment 3~12

[0068]

[0069]

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Abstract

The invention provides a solidification method of radioactive waste residues. The solidification method comprises the following steps: S1, crushing the radioactive waste residues to be treated into crushed residues; S2, uniformly mixing the crushed residues with a functional filler and cement to obtain a mixture; S3, adding water into sodium silicate or water glass to obtain a sodium silicate aqueous solution, and then adding inorganic acid to obtain acidified water glass; S4, adding PVA into water at a preset temperature, and dissolving to obtain a PVA solution; and S5, uniformly mixing the mixture with the acidified sodium silicate and the PVA solution to obtain a castable, and then pouring and maintaining the castable to obtain a cement solidified body waste residue bag. By utilizing the curing and film-forming effects of PVA and the filling effect of active silica gel in acidified sodium silicate, the strength and water resistance of a solidified body are remarkably improved, and the porosity of the solidified body is reduced, so that the ion diffusion resistance is increased, and the diffusion and exudation rate of nuclide ions is remarkably reduced.

Description

technical field [0001] The invention belongs to the technical field of radioactive waste residue treatment, and in particular relates to a method for solidifying radioactive waste residue. Background technique [0002] According to the level of radioactivity, radioactive waste can be divided into low-level waste, medium-level waste and high-level waste. Radioactive waste is the low-level and intermediate-level waste produced by mining and smelting in the nuclear industry. Since the 1950s, my country began to build uranium mines and hydrometallurgical plants (water smelters). The gangue hills of these uranium mines and the tailings dams of water smelters all have a large amount of radioactive waste. The corrosiveness and radioactivity of these radioactive wastes will pose a threat to human health and harm the ecological environment. Therefore, how to safely and reliably dispose of radioactive waste has become a major global research topic. [0003] At present, geological d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B22/14C04B22/16C04B24/26C04B14/06C04B111/27
CPCC04B24/2623C04B28/04C04B40/0039C04B2111/00784C04B2111/27C04B2201/50C04B18/0463C04B14/102C04B18/08C04B12/04C04B22/147C04B14/062C04B18/141C04B22/16
Inventor 洪昌寿陈逸凡刘永罗明亮李熙琪兰明李向阳汪弘余修武李苏哲陈艳
Owner NANHUA UNIV
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