A kind of preparation method of strontium selective adsorbent

A selective, adsorbent technology, used in chemical instruments and methods, radioactive purification, other chemical processes, etc., can solve problems such as troublesome curing treatment, and achieve the effects of simple steps, strong salt resistance, and high selectivity

Active Publication Date: 2019-12-24
CHINA INSTITUTE OF ATOMIC ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Nuclear power plants and other strontium-containing waste liquids with high salt content are mostly treated with ion exchange resins, but as organic matter, ion exchange resins are difficult to solidify and are recognized as difficult-to-treat wastes in the world.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A preparation method of strontium selective adsorbent, the method comprises the following steps:

[0026] Present embodiment prepares 1Kg adsorbent and has used 2.64Kg C 16 h 36 o 4 Ti, 0.84Kg Si(OC 2 h 5 ) 4 And 1.4L ethanol, the specific steps are:

[0027] To 0.1mol / L NaOH solution, dropwise add C 16 h 36 o 4 Ti, Si(OC 2 h 5 ) 4 And the organic mixture composed of ethanol, the C in the organic mixture 16 h 36 o 4 Ti and Si(OC 2 h 5 ) 4 The ratio of the amount of substances is 2:1, while NaOH and C 16 h 36 o 4 The ratio of the amount of Ti to the substance is 1:1; the droplet velocity of the machine-mixed liquid is 81.33mL / min, and the reaction time is not less than 2h; continuous stirring is required during the reaction. After the reaction is completed, filter and wash to obtain a white paste, and the white The paste was subjected to freeze-thaw dehydration treatment for 3 times, each time the freezing temperature was ~10°C for 2 hours, and the pa...

Embodiment 2

[0031] Different from Example 1, C 16 h 36 o 4 Ti and Si(OC 2 h 5 ) 4 The ratio of the amount of substances is 1:2; the concentration of NaOH solution is 0.05mol / L; NaOH and C 16 h 36 o 4 The molar ratio of Ti was 1:2; the dropping rate of the organic mixture was 70mL / min; the obtained white paste lost water by freezing and thawing 4 times, the freezing time was 3 hours, and the temperature was -6°C.

Embodiment 3

[0033] Different from Example 1, C 16 h 36 o 4 Ti and Si(OC 2 h 5 ) 4 The ratio of the amount of substances is 3:1; the concentration of NaOH solution is 0.15mol / L; NaOH and C16 h 36 o 4 The molar ratio of Ti was 1:4; the dropping rate of the organic mixture was 90mL / min; the obtained white paste lost water twice by freezing and thawing, the freezing time was 4 hours, and the temperature was -4°C.

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PUM

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Abstract

The invention belongs to the technical field of adsorption of radioactive nuclides and discloses a preparation method of a selective Si adsorbent. The method comprises following steps: (1), an organic mixed solution containing C16H36O4Ti, Si(OC2H5)4 and ethyl alcohol is added dropwise to an NaOH solution and is stirred during dropwise adding; (2), after a reaction, filtering and washing are performed, and white paste is obtained; (3), the white paste is subjected to freezing-thawing dehydration treatment; (4), the white paste obtained in the step (3) is naturally dried at the room temperature, and the white powdery selective Si adsorbent can be obtained. The preparation method of the selective Si adsorbent adopts simple steps, the prepared adsorbent has quite high salt tolerance and very high selectivity for Si, and the distribution coefficient can reach 105 ml / g.

Description

technical field [0001] The invention belongs to the technical field of radionuclide adsorption, and in particular relates to a preparation method of a strontium selective adsorbent. Background technique [0002] The manufacturing process of NUE fuel element (natural uranium fuel equivalent fuel) will produce a large amount of raffinate tail water containing 2mol / L nitric acid and process wastewater containing a large amount of ammonium salt. waste water". The amount of mixed wastewater is 9000m 3 / a (according to the annual production time of 6000 hours), the waste water contains about 112.37Bq / L 90 Sr. In order to protect public health and safety and ensure the sustainable development of nuclear energy, the generated 90 Sr wastewater must be properly treated and disposed of. [0003] 90 Sr is one of the main fission products in NUE waste liquid, its half-life is 28.79a, 100% β decay, E β =546keV, the fission product is 90 Y. because 90 Sr has a long half-life, and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/22B01J20/28B01J20/30G21F9/12
CPCB01J20/22B01J20/223B01J20/28057G21F9/12
Inventor 郑宇李玉松王雷游新锋郑文俊张振涛
Owner CHINA INSTITUTE OF ATOMIC ENERGY
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