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Method for treating nuclear power plant radioactive waste liquid based on birnessite in-situ reaction

A technology of radioactive waste liquid and birnessite, which is applied in radioactive purification, nuclear engineering, etc., to achieve the effect of not being easy to secondary pollution, convenient for subsequent treatment, and simple in process

Active Publication Date: 2016-02-24
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are many reports on the adsorption of metal ions such as arsenic, zinc, copper, cobalt, nickel, and uranium by manganese oxide adsorbents.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The volume of the simulated waste water sample is 500mL, the reaction temperature is controlled by a constant temperature water bath, and the solution is mixed by electric stirring when adding divalent manganese salt and lye dropwise.

[0032] The experimental steps are: cobalt chloride hexahydrate (CoCl 2 ·6H 2 O) Dubbed as Co 2+ Concentration of 1000mg / L solution, take 10ml and add it to a 250ml volumetric flask to configure Co 2+ A simulated aqueous solution with a concentration of about 40mg / L; then add boric acid (H 3 BO 3 ) 2.8182g, make B in the solution 3+ The concentration is 1000mg / L, stir evenly to form the original aqueous solution and transfer it into a 1000mL four-neck flask; then, add KMnO 4 solution, stir evenly; then add MnCl in proportion 2 solution; adjust the pH value of the solution (the drop rate is about 1.5mL / min) and add Fe 3 o 4 powder, and then stirred for a period of time. After the reaction is over, let it stand still, and then sepa...

Embodiment 2

[0036] The experimental procedure is the same as in Example 1, and the process parameters used are different from Example 1, as follows: the temperature set in the constant temperature water bath is 40°C, the pH of the solution adjusted by NaOH is 10, and the Mn in the solution 2+ / Co 2+ The molar ratio is 10:1, Fe 3 o 4 and the generated birnessite MnO 2 The molar ratio is 0, and the stirring time is 30 minutes.

[0037] The experimental results are: Co 2+ Concentration 9.096μg / L, total Mn 2+ The concentration is 124.7μg / L, and the color of the sediment is brown to black.

Embodiment 3

[0039] The experimental procedure is the same as in Example 1, and the process parameters used are different from Example 1, as follows: the temperature set in the constant temperature water bath is 40°C, the pH of the solution adjusted by NaOH is 10, and the Mn in the solution 2+ / Co 2+ The molar ratio is 10:1, Fe 3 o 4 and the generated birnessite MnO 2 The molar ratio was 0, and the stirring time was 60 minutes.

[0040] The experimental results are: Co 2+ Concentration 6.193μg / L, total Mn 2+ The concentration is 133.6μg / L, and the color is brown to black.

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Abstract

The invention relates to a method for treating nuclear power plant radioactive waste liquid based on the birnessite in-situ reaction. The method comprises following steps: (1) adding potassium permanganate into the nuclear power plant waste liquid containing radioactive elements and uniformly mixing the liquid; (2) adding manganous salt into the liquid on the basis that the molar ratio of manganous ions (Mn2+) in the potassium permanganate to manganous ions (Mn2+) in the manganous salt is 3:2, and uniformly mixing the liquid to obtain the mixed solution; (3) adding an alkaline solution into the mixed solution drop by drop so as to adjust the pH of the mixed solution to be 8-13, enabling the potassium permanganate to react with the manganous salt to generate birnessite MnO2, then adding magnetic Fe3O4 powder into the solution, and stirring the solution at a constant temperature of 20-80 DEG C for 15-300 minutes; and (4) allowing the solution to stand, performing magnetic separation and removing the precipitate, thereby completing the purification treatment of the nuclear power plant radioactive waste liquid. Compared with the prior art, the method is advantageous in that the steps are simple, conditions are easy to control, the method is economical and practical, the radioactive ion removing efficiency is high, the using range of the method is wide, and no secondary pollution is formed.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and relates to a method for treating radioactive waste liquid of a nuclear power plant, in particular to a method for treating radioactive waste liquid of a nuclear power plant based on in-situ generation of birnessite. Background technique [0002] Faced with severe resource shortages, countries are paying more and more attention to the development and application of nuclear energy. As an economical, efficient and clean new energy source, nuclear energy will inevitably increase its proportion in all energy sources. However, with the rapid development of nuclear energy in my country, the amount of radioactive waste generated during the operation of nuclear power plants is also increasing sharply, which has increased the burden on the environment. With the government's emphasis on environmental protection and the enhancement of people's awareness of environmental protection, how ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G21F9/10G21F9/12
CPCG21F9/10G21F9/125
Inventor 詹瑛瑛黄光团任英英沈其铖欧乙慧蒋威雨
Owner EAST CHINA UNIV OF SCI & TECH
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