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Method for curing fluorine-containing radioactive waste liquid

A technology of radioactive waste liquid and solidification method, which is applied in radioactive purification, nuclear engineering and other directions, can solve the problems of reduced compressive strength of cement solidified body, short initial setting time of cement slurry, and failure to meet national standard requirements.

Active Publication Date: 2018-09-11
SHANGHAI INST OF APPLIED PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] When Portland cement solidifies fluorine-containing radioactive waste liquid with high fluoride ion concentration, the initial setting time of cement slurry will be greatly reduced. When the fluoride ion concentration is 8wt%, the initial setting time is only 2-3min; after adding retarder (borax) As a result, the compressive strength of the cement solidified body is greatly reduced, which cannot meet the requirements of the national standard
[0004] Therefore, new cement formulations and methods are urgently needed for the solidification of fluorine-containing radioactive waste liquid to solve the problem of short initial setting time of cement slurry

Method used

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  • Method for curing fluorine-containing radioactive waste liquid
  • Method for curing fluorine-containing radioactive waste liquid
  • Method for curing fluorine-containing radioactive waste liquid

Examples

Experimental program
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Embodiment 1

[0027] A method for solidifying a fluorine-containing radioactive waste liquid provided according to the present invention includes step S1, and a fluorine-containing radioactive waste liquid is provided, wherein the fluorine-containing radioactive waste liquid includes fluorine and radioactive waste liquid.

[0028] The radioactive waste liquid adopts CsNO 3 , Sr(NO 3 ) 2 and Co(NO 3 ) 2 The solutions were prepared by mixing, and the fluorine was provided by NaF added to the radioactive waste. In this way, the fluorine-containing radioactive waste liquid adopts CsNO 3 , Sr(NO 3 ) 2 , Co(NO 3 ) 2 and NaF solution were prepared to form a simulated radioactive waste liquid, wherein the contents of radioactive elements Sr, Cs and Co were 4.412g / L, 4.601g / L and 4.305g / L respectively.

[0029] A method for solidifying fluorine-containing radioactive waste liquid provided by the present invention includes step S2, adding cement ash and 44.4 mL of fluorine-containing radioac...

Embodiment 2- Embodiment 12

[0043] The experimental process is basically the same as in Example 1, except that the amounts of the components used in each example are different, as shown in Table 1 below.

[0044]

[0045] In Example 2-Example 12, the fluidity of each cement slurry is moderate, and there is no delamination phenomenon. The initial setting time of each cement slurry is between 20min-30min, and the final setting is within 1-2min after the initial setting, and the initial setting time is longer.

[0046] Each first cement solidified body has a complete appearance without cracks.

[0047] The compressive strength of each second cement solidified body is greater than 50 MPa, which meets the limit value of the national standard GB14569.1-2011, and the compressive strength is relatively high. Co of each second cement solidified body 2+ The 42d leaching rates were lower than 1.54×10 -7 cm / d, Sr 2+ The 42d leaching rates were lower than 2.63×10 -5 cm / d, Cs + The 42d leaching rates were low...

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Abstract

The invention provides a method for curing fluorine-containing radioactive waste liquid. The method comprises the following steps of S1, providing the fluorine-containing radioactive waste liquid, wherein the fluorine-containing radioactive waste liquid comprises fluorine and radioactive waste liquid; S2, mixing cement dust and the fluorine-containing radioactive waste liquid to form a cement slurry, wherein the cement dust comprises KH2PO4, re-burned MgO, additives and borax; S3, subjecting the cement slurry to solidifying, initial coagulating and final coagulating to form a first cement solidified body; S4, curing the first cement solidified body to form a second cement solidified body. The second cement solidified body has high compressive strength, can effective pack radioactive elements and fluoride ions, and meets the final disposal requirements.

Description

technical field [0001] The present invention relates to a solidification method of radioactive waste liquid, and more particularly to a solidification method applied to fluorine-containing radioactive waste liquid. Background technique [0002] The molten salt reactor uses molten fluorine salt as the main coolant, and the fuel of the liquid molten salt reactor itself is dissolved in the high temperature molten salt of fluoride. The development and operation of molten salt reactors will generate radioactive wastes with fluorine salts as the main component. Various types of radioactive wastes will also be generated during the dry reprocessing of spent fuel, fuel salt analysis and testing, and the separation and recovery of fuel added salts. Radioactive waste must include fluorine-containing radioactive waste. In order to ensure the safety of the surrounding public and reduce the pollution of the waste liquid to the environment, it is necessary to reduce the volume and solidif...

Claims

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Application Information

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IPC IPC(8): G21F9/16G21F9/20
CPCG21F9/16G21F9/20
Inventor 钱正华刘学阳乔延波夏晓彬马洪军王帅秦强施柳青彭红花
Owner SHANGHAI INST OF APPLIED PHYSICS - CHINESE ACAD OF SCI