A treatment method for waste water containing radioactive elements

A radioactive element and treatment method technology, applied in the field of radioactive element wastewater treatment, can solve the problem of small adsorption capacity, achieve the effect of improved adsorption capacity, complete crystal form, and easy control of the process

Active Publication Date: 2021-07-09
NANHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It can be seen from the experimental data that the hydrotalcite material also has the disadvantage of small adsorption capacity.

Method used

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  • A treatment method for waste water containing radioactive elements
  • A treatment method for waste water containing radioactive elements
  • A treatment method for waste water containing radioactive elements

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Press n[CO(NH 2 ) 2 ]: n(Mg 2+ +Al 3+ )=10:1, n(Mg 2+ ): n(Al 3+ )=2.5:1, weigh 21g CO(NH 2 ) 2 , dissolved in 50ml deionized water; 6.4g Mg(NO 3 ) 2 ·6H 2 O and 3.75gAl(NO 3 ) 3 9H 2 O, dissolved in 100ml deionized water. Add the two solutions into a three-neck flask with a stirrer at the same time, and continue stirring at 60°C for 30 min after the addition. The prepared solution was transferred to a polytetrafluoroethylene autoclave, put into an oven, and crystallized at a constant temperature of 150° C. for 12 hours. After that, the reaction kettle was taken out and cooled to room temperature. The resulting precipitate was filtered, washed several times with deionized water, and then dried at 100°C for 6 h to obtain the product, which was designated as Mg-Al-LDHs.

[0041] Wash the above hydrotalcite Mg-Al-LDHs with pure water to neutrality, then put it in a muffle furnace, raise the temperature to 500°C in an air atmosphere, and keep it warm for 6h, t...

Embodiment 2

[0057] This example is to investigate the adsorption of composite materials to uranium-containing wastewater with different pH values. Figure 7 The initial concentration of uranium-containing wastewater in the test shown is 30mg.L -1 , the adsorption time is 2.5 hours, the wastewater temperature is 30°C, the volume of the uranium-containing wastewater used in the test is 520mL, the amount of adsorbent in the wastewater is 0.001g, and the pH value of the wastewater is 2-10.

[0058] Depend on Figure 7 It can be seen that the pH value of the wastewater is in the range of 3-8, and the adsorption amount of uranium in the uranium-containing wastewater by the composite material is maintained between 1350-1550 mg / g. It shows that the method of the present invention is suitable for a wide range of pH values ​​of uranium-containing wastewater.

[0059] Analyzing the reason, it may be that when the uranium-containing wastewater is in a weak acid or weak base environment, the calcine...

Embodiment 3

[0061] This example is to investigate the adsorption of uranium in uranium-containing wastewater by the composite material under the interference of different interfering ions. Figure 8 The initial concentration of uranium in the uranium-containing wastewater in the test shown is 60 mg.L -1 , the adsorption time is 2.5 hours, the wastewater temperature is 30°C, the volume of the uranium-containing wastewater used in the test is 520mL, the amount of adsorbent in the wastewater is 0.001g, and the pH value of the wastewater is 3.

[0062] In this example, a certain concentration of Na + , K + , Fe 3+ , Cu 2+ , Zn 2+ and Ni 2+ The adsorption of uranium in uranium-containing wastewater by the composite material. Depend on Figure 8 It can be seen that different interfering ions adsorb UO on the composite material 2 2+ The impact is different. Among them, Na + and K + Adsorption of UO on composite materials 2 2+ Little effect, Ni 2+ Adsorption of UO on composite mate...

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Abstract

The invention provides a method for treating waste water containing radioactive elements, which comprises using a functionalized composite material to treat the waste water, and the functionalized composite material includes calcined layered double metal hydroxide and grafted mercapto Propyl alkoxysilane, and includes the functionalized composite material absorbing radioactive elements under the condition of ultrasonic participation to treat the waste water. The composite material provided by the invention not only makes good use of the hydrotalcite-like space layer structure but also makes good use of the high-efficiency adsorption capacity of the mercapto group for heavy metal ions. Compared with common adsorbents, the adsorption capacity is significantly improved, and the maximum adsorption capacity of the composite material of the invention is 30 times that of unmodified hydrotalcite for uranium.

Description

technical field [0001] The invention belongs to the field of resource utilization and environmental protection, and in particular relates to a treatment method for waste water containing radioactive elements. Background technique [0002] In recent years, with the continuous development of nuclear energy, radioactive nuclear waste has gradually increased, which has brought a heavy burden and serious crisis to the environment and ecology. Therefore, how to properly deal with radioactive nuclear pollution has become a worldwide environmental protection issue. At present, the methods for removing radioactive elements in the water environment include: chemical precipitation method, ion exchange method, solvent extraction method and adsorption method, etc. Among them, the adsorption method has high efficiency, low cost, simple treatment process and is not easy to cause secondary pollution, etc. Advantages, has been widely used in the actual wastewater treatment. Due to the lack...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/28C02F101/20
CPCC02F1/288C02F2101/006C02F2101/20
Inventor 阳鹏飞徐源合柯国军艾勇尹纳
Owner NANHUA UNIV
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