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A method for electrochemically synthesizing ferrite to treat nuclear power plant radioactive waste liquid

A technology for radioactive waste liquid and nuclear power plant, applied in electrochemical water/sewage treatment, chemical instruments and methods, radioactive purification, etc., can solve the problems of complex operation and high cost, achieve simple process, convenient operation, and not easy to secondary pollution Effect

Active Publication Date: 2018-06-26
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, both of these two methods need to consume a large amount of iron salts to provide conditions for the formation of ferrite, so the operation is more complicated and the cost is high when treating a large amount of wastewater

Method used

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  • A method for electrochemically synthesizing ferrite to treat nuclear power plant radioactive waste liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The volume of the simulated waste liquid water sample is 500mL, the reaction temperature is controlled by a constant temperature water bath, and the solution is mixed by electric stirring when the lye is added dropwise.

[0028] The experimental steps are: cobalt chloride hexahydrate (CoCl 2 ·6H 2 O) Dubbed as Co 2+ Concentration is 500mg / L solution, take 5ml and join in the volumetric flask of 500ml, to configure Co 2+ A simulated aqueous solution with a concentration of about 5 mg / L; then add boric acid (H 3 BO 3 ) 2.8560g, make B in the solution 3+ The concentration is 1000mg / L; then, add the electrolyte Na 2 SO 4 , and stir evenly to form the original aqueous solution; then transfer it into a 600ml container, and adjust the pH value of the solution to the experimental design value with 60g / L NaOH in an electric heating constant temperature water temperature tank at a certain temperature; select the electrode, current density, and electrode required for the exp...

Embodiment 2

[0032] The experimental procedure is the same as in Example 1, and the process parameters adopted are different from Example 1, as follows: the temperature set in the constant temperature water bath is 60°C, the initial pH of the solution adjusted by NaOH is 8, and the current density is 40mA / cm 2 , reaction time 50min, Na 2 SO 4 The concentration is 0.1mol / L, the rotation speed is 180r / min, and the electrode distance is 1cm.

[0033] The experimental results are: Co 2+ The concentration is 2.14μg / L, the total Fe concentration is 159.57μg / L, the color of the sediment is brown-black, and the magnetism is strong.

Embodiment 3

[0035] The experimental procedure is the same as in Example 1, and the process parameters adopted are different from Example 1, as follows: the temperature set in the constant temperature water bath is 60°C, the initial pH of the solution adjusted by NaOH is 8, and the current density is 50mA / cm 2 , reaction time 50min, Na 2 SO 4 The concentration is 0.1mol / L, the rotation speed is 180r / min, and the electrode distance is 1cm.

[0036] The experimental results are: Co 2+ The concentration is 1.00μg / L, the total Fe concentration is 58.54μg / L, the color is brown-black, and the magnetism is strong.

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Abstract

The invention relates to a method for treating radioactive waste liquid in a nuclear power plant through electrochemical synthesis of ferrite. The method comprises the following steps: adding supporting electrolyte into the radioactive waste liquid in the nuclear power plant, and uniformly stirring to obtain a mixed solution; adding an alkaline solution into the mixed solution to adjust the pH, inserting electrodes, performing constant-temperature electrolytic synthesis, standing the mixed solution obtained after completion of a reaction, filtering, performing solid-and-liquid separation to purify the radioactive waste liquid in the nuclear power plant, and efficiently removing a precipitate through magnetic separation. By the method, through electrochemical synthesis of the ferrite, the ferrite is generated in the electrolytic process, soluble metal ions in the solution and the ferrite can form a stable ferrite coprecipitate and the ferrite coprecipitate is removed, so that radioactive element ions in the radioactive waste liquid in the nuclear power plant are efficiently removed; the method has the advantages of a simple process, convenient operation, unlikeliness in secondary pollution and the like.

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 electrochemically synthesizing ferrite to treat the radioactive waste liquid of a nuclear power plant. Background technique [0002] With the increasing use of nuclear energy technology, radioactive waste water continues to enter the environment, which seriously threatens environmental safety and human health. Therefore, it is of great significance to systematically study the treatment methods of radioactive waste liquid from nuclear power plants. [0003] At present, the technologies applied to the treatment of medium and low radioactive waste liquid in nuclear power plants include: chemical precipitation method, ion exchange method, adsorption method, evaporation concentration method, membrane separation method, biological method, etc. The solid-liquid separatio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G21F9/04G21F9/06C02F1/46C02F1/461
CPCC02F1/46C02F1/461G21F9/04G21F9/06
Inventor 黄光团张禛王蕾雅缪春霞
Owner EAST CHINA UNIV OF SCI & TECH
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