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Method for treating wastewater generated by nuclear power plant by utilizing chemical precipitation

A chemical precipitation, nuclear power plant technology, applied in nuclear engineering, radioactive purification and other directions, can solve the problems of higher water content of sediment than theoretical value, unsatisfactory magnetic separation effect of sediment, etc. Effect

Inactive Publication Date: 2015-04-29
EAST CHINA UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Neutralizing ferrite method is a special kind of chemical precipitation method. Its main feature is that it can remove a variety of heavy metal ions at the same time. The metal ions entering the ferrite crystal lattice are not easy to leach and cause secondary pollution. The sediment volume is small and has certain magnetic properties. However, in practical applications, it is found that the magnetic separation effect of the sediment formed by the neutralization method is not ideal and the moisture content of the sediment is higher than the theoretical value. Therefore, the method is improved and the ion treatment The optimization scheme with high efficiency and good sediment magnetic separation effect is of great significance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Dosing Fe in 500mL nuclear power plant simulated radioactive wastewater 3 o 4 Seed crystals, adjust the pH value with NaOH solution and stir the reaction in an electric thermostatic water temperature tank. Radioactive elements contained in wastewater include 58 Co. 60 Co. 55 Fe, 59 Fe, 65 Zn or 54 Mn et al. The specific experimental steps are: cobalt chloride hexahydrate (CoCl 2 ·6H 2 O) Dubbed as Co 2+ Concentration is the solution of 100mg / L, gets 25ml and joins in the volumetric flask of 500ml, obtains Co 2+ The nuclear power plant simulated cobalt-containing wastewater with a concentration of about 5 mg / L; adding boric acid (H 3 BO 3 ) 2.8182g, make B in the solution 3+ The concentration is about 1000mg / L; then add ferric salt and ferrous salt according to the metering, stir evenly; then transfer to a 500mL four-necked flask, and add Fe 3 o 4 0.34 g of seed crystals were stirred and reacted for 1 h with NaOH to adjust the pH value of the solution (the...

Embodiment 2

[0030] Experimental procedure is identical with embodiment 1, and the process parameter that adopts is different from embodiment 1, specifically as follows: the pH of the solution adjusted by NaOH is 10.5, and Fe in solution 3+ / Fe 2+ The molar ratio is 3.00, Fe 2+ / Co 2+ The molar ratio is 10, and the NaOH concentration used is 2mol / L.

[0031] The experimental results are: Co 2+ The concentration is 0.49μg / L, the total iron concentration is 12.96μg / L, the sediment has strong magnetic properties, and the color is brownish black to black.

Embodiment 3

[0033] Experimental procedure is identical with embodiment 1, and the process parameter that adopts is different from embodiment 1, specifically as follows: the pH of the solution adjusted by NaOH is 11.5, and Fe in the solution 3+ / Fe 2+ The molar ratio is 3.00, Fe 2+ / Co 2+ The molar ratio is 20, and the NaOH concentration used is 8mol / L.

[0034] The experimental results are: Co 2+ The concentration is 0.69μg / L, the total iron concentration is 25.32μg / L, the sediment has strong magnetic properties, and the color is brownish black to black.

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Abstract

The invention relates to a method for treating radioactive wastewater generated by a nuclear power plant by utilizing chemical precipitation, which comprises the following steps of: adding iron salt and ferrous salt into the radioactive wastewater generated by the nuclear power plant, adding pure Fe3O4 powder and uniformly stirring; then dropwise adding NaOH solution into the mixture to regulate a pH value and performing stirred reaction for a certain time at a constant temperature; and finally, carrying out solid-liquid separation to complete treatment on the radioactive wastewater, wherein obtained precipitates can be efficiently removed by magnetic separation. Compared with the prior art, the method can solve the problems of a large quantity of radioactive sludge generated by a conventional chemical precipitation method, high easiness for causing secondary pollution and the like, can be used for implementing high-efficiency removal of radionuclides in the radioactive wastewater generated by the nuclear power plant, which are similar to cobalt ions and easily combined with ferrite crystals, and high-efficiency magnetic separation of a product, has a simple process, is convenient to operate and is difficult to cause the secondary pollution.

Description

technical field [0001] The invention belongs to the field of environmental protection technology, and in particular relates to two types of waste water treatment technologies, neutralization ferrite method and magnetic separation method, and is suitable for the treatment of all industrial waste water and nuclear power plant waste water containing heavy metal ions easily combined by ferrite crystals, especially It is of great significance in the treatment of radionuclides. Background technique [0002] The treatment and disposal of nuclear waste has been the most concerned issue in the development of nuclear power since the 1970s, and it is also one of the key issues related to the further healthy development of nuclear power. [0003] At present, the commonly used treatment methods for radioactive wastewater in nuclear power plants mainly include chemical precipitation, adsorption, ion exchange, evaporation and concentration, and membrane separation. The solid waste generat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G21F9/06
Inventor 黄光团邢辉陈希飞郭世鑫何小红
Owner EAST CHINA UNIV OF SCI & TECH