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Method for treating nuclear fuel element process wastewater by using polyamine functional fiber

A functionalized fiber technology, applied in fiber processing, chemical instruments and methods, nuclear engineering, etc.

Pending Publication Date: 2021-09-10
SOUTHWEAT UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The XKXW-V described in the present invention is an adsorption material with a polyamine group grafting rate ≥ 45%, which has good selectivity and high uranium adsorption capacity. At present, there is no such fiber used in nuclear fuel Reports on the field of high-fluorine-containing uranium-containing wastewater produced in the production process of components

Method used

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  • Method for treating nuclear fuel element process wastewater by using polyamine functional fiber
  • Method for treating nuclear fuel element process wastewater by using polyamine functional fiber
  • Method for treating nuclear fuel element process wastewater by using polyamine functional fiber

Examples

Experimental program
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Effect test

Embodiment 1

[0019] Take 0.02g XKXW-V respectively, add 50mL uranium solution with initial concentration of 10, 20, 50, 80, 100, 120, 150, 200, 250, 300, 350mg / L, under the condition of 20, 30, 40℃, Adjust the optimum pH, react for 2 hours, the result is as follows figure 1 as shown in a. Using the Langmuir model and the Freundlich model to simulate, we get figure 1 b and figure 1 c. The results show that the adsorption of the fiber conforms to the Langmuir adsorption isotherm, and the maximum adsorption amount of XKXW-V to uranium is 459.27mg / g.

Embodiment 2

[0021] Take 0.02g XKXW-V, add 50ml of uranium solution with an initial uranium concentration of 50 mg / L and a fluorine concentration of 2g / L, and the pH values ​​are 2, 3, 4, 5, 6, 7, 8, 9, 10, 11. React for 2 hours, set the reaction temperature to 25°C, take the supernatant to analyze the concentration of uranium, F - concentration, the result is as figure 2 . The results showed that the optimum pH for adsorption was 7, and the adsorption capacity reached 99.45 mg / g under this condition, which was greatly improved compared with the original polyacrylonitrile fiber uranium adsorption capacity, and was not affected by the high concentration of F - Impact.

Embodiment 3

[0023] Take 0.02 g XKXW-V, add 50ml, the initial uranium concentration is 50 mg / L, and make the F- concentration in it respectively 1, 2, 3, 4, 5, 6g / L, adjust the pH to 7, and react at 25°C 2h, measure the concentration of uranium in the solution after adsorption, F - concentration, the result is as image 3 As shown in a and 3b, it indicates that F - The increase of concentration will reduce the adsorption capacity of XKXW-V to uranium to some extent.

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Abstract

The invention discloses a method for treating uranium fluoride wastewater of a nuclear fuel element process, and belongs to the technical field of radioactive waste liquid treatment. According to the method, self-made novel multi-amino functional fiber (numbered as XKXW-V) is used as an adsorption material (wherein the multi-amino grafting rate is greater than or equal to 45 percent) to adsorb and extract uranium in the uranium fluoride wastewater. According to the method provided by the invention, the adopted material preparation method is simple and rapid, the physical and chemical properties of the XKXW-V are stable, hydrophilicity is good, uranium selectivity is high, and the uranium adsorption capacity reaches up to 459.27 mg / g. The XKXW-V developed by the invention has good selectivity (Kd is greater than or equal to 559.9 L / g) to uranium aiming at high-concentration F-coexisting acidic uranium fluorine wastewater in a real pressurized water reactor fuel element preparation process, and the uranium removal rate can reach 99.8 percent. Therefore, the XKXW-V developed by the invention has a relatively good application prospect in deep purification of the uranium fluoride wastewater generated at the front end of nuclear fuel circulation.

Description

technical field [0001] The invention belongs to the field of radioactive wastewater treatment, and in particular relates to a novel polyamine-based functionalized fiber for deep purification of high-fluorine uranium-containing wastewater produced in the production process of pressurized water reactor nuclear fuel elements and efficient extraction of uranium. Background technique [0002] With the rapid development of China's nuclear power industry, the demand for uranium is increasing day by day. At the front end of the nuclear fuel cycle, especially in the manufacturing process of nuclear fuel elements, due to its current main use of UF 6 As the raw material for the preparation of UO2 cores, a large amount of high-fluorine-containing uranium-containing wastewater will be produced, in which the fluorine content can reach 1-20 g / L, and its acidity is extremely strong and has certain corrosiveness. At present, in the nuclear industry system, silica gel is mainly used to remov...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06M11/00D06M13/332B01J20/26G21F9/00G21F9/20G21F9/12D06M101/28
CPCD06M11/00D06M13/332B01J20/265G21F9/007G21F9/20G21F9/12D06M2101/28
Inventor 聂小琴张玉靖董发勤李书居刘畅万强何平潘宁王君玲丁聪聪程文财夏雪蒋亚廷
Owner SOUTHWEAT UNIV OF SCI & TECH
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