Preparation method of selective adsorbent for magnetic cesium

A cesium selective, adsorbent technology, applied in the field of preparation of magnetic cesium selective adsorbent, can solve the problems of easy hydrolysis, water solubility, poor radiation stability, etc., achieve fewer steps, good radiation resistance, and easy industrialization The effect of production

Active Publication Date: 2014-09-24
CHINA INSTITUTE OF ATOMIC ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Generally, granular ion exchange resins are mostly used as fillers in ion exchange beds, but ion exchange resins have the disadvantage of poor radiation stability. In contrast, inorganic ion exchangers have high selectivity, good radiation stability and thermal stability, and mechanical stability. It has the advantages of high performance, and the treated waste exchanger can be directly solidified. However, the inorganic ion exchanger also has problems such as easy hydrolysis and water solubility, which need to be solved.

Method used

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  • Preparation method of selective adsorbent for magnetic cesium
  • Preparation method of selective adsorbent for magnetic cesium
  • Preparation method of selective adsorbent for magnetic cesium

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preparation example Construction

[0030] like figure 1 Shown, the preparation method of magnetic cesium selective adsorbent provided by the present invention comprises the steps:

[0031] (1) To Ni powder and K 4 Fe(CN) 6 ·3H 2 Deionized water was added to the O mixture so that the K 4 Fe(CN) 6 ·3H 2 O completely dissolved; Ni powder and K 4 Fe(CN) 6 ·3H 2 The mass ratio of O is 1:5~1:10, the preferred value is 1:7; the amount of deionized water added is K 4 Fe(CN) 6 ·3H 2 20 to 30 times the mass of O, preferably 26 times;

[0032](2) Place the obtained dissolved matter in a constant temperature water bath at 95±5°C, add HCl solution dropwise therein, and keep stirring for 20-40min; the concentration of the added HCl solution is 1.0~3.0mol / L, preferably 2.4mol / L; the mass ratio of added HCl to Ni is 2:1 to 4:1, preferably 3:1; the stirring speed is 600 to 850 rpm, and the preferred value is 750 rpm;

[0033] (3) statically aging the obtained reactant at room temperature for 20 to 40 minutes, unti...

Embodiment 1

[0054] Accurately weigh a certain amount of 0.1g Ni powder and 0.76g K 4 Fe(CN) 3 ·3H 2 O in a 50mL beaker, add 20mL deionized water to dissolve K 4 Fe(CN) 3 ·3H 2 O dissolves completely. Then, 2 mL of 2.4 mol / L HCl solution was slowly added dropwise in a water bath at 95±5°C, and the reaction was stirred continuously for 30 minutes at a stirring speed of 750 rpm, and then aged at room temperature for about 30 minutes. Then, the precipitate was washed continuously with deionized water until the washing liquid was clear and transparent, and the pH remained basically unchanged. Finally, the precipitate was dried at a constant temperature of 100°C for 20 h.

Embodiment 2

[0056] Accurately weigh a certain amount of 0.1g Ni powder and 0.5g K 4 Fe(CN) 3 ·3H 2 O in a 50mL beaker, add 15mL deionized water to dissolve K 4 Fe(CN) 3 ·3H 2 O dissolves completely. Then, 3.2mL of 1.0mol / L HCl solution was slowly added dropwise in a water bath at 95±5°C, and the reaction was stirred continuously for 20min at a stirring speed of 600rpm, and then left at room temperature for about 40min. Then, the precipitate was washed continuously with deionized water until the washing liquid was clear and transparent, and the pH remained basically unchanged. Finally, the precipitate was dried at a constant temperature of 90°C for 24 hours.

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Abstract

The invention belongs to an adsorbent preparation technology of radioactive liquid waste treatment process and in particular relates to a preparation method of a selective adsorbent for magnetic cesium. The preparation method comprises the following steps of: firstly, adding deionized water into a mixture of Ni powder and K4Fe(CN)6.3H2O to completely dissolve the K4Fe(CN)6.3H2O; then dropwise adding HCl solution into the obtained solute which is placed in thermostatic waterbath, and continuously stirring the mixture for reacting for a period of time; stilling the obtained reactant for aging for a period of time at a room temperature until a crystal structure grows completely; then washing generated sediment by deionized water until the washing liquid is colorless and transparent and the pH value is basically unchanged; and finally, drying the washed sediment at a constant temperature to constant weight to obtain the ferrous potassium nickel cyanide-nickel adsorbent. The preparation method provided by the invention has less steps and a simple process and facilitates industrial production. A better volume reduction ratio and decontamination factor can be achieved when the selective adsorbent is used for processing cesium-contained waste liquid.

Description

technical field [0001] The invention belongs to the adsorbent preparation technology in the radioactive waste liquid treatment process, and in particular relates to a preparation method of a magnetic cesium selective adsorbent. Background technique [0002] With the vigorous development of nuclear power in our country, a large amount of low and medium level liquid waste will be produced. In addition to nuclear power operation waste liquid, a large amount of low- and medium-level waste liquid will also be generated in the fields of decommissioning and decontamination of various nuclear facilities in my country, isotope production, nuclear technology application and scientific research. This kind of waste liquid has a wide range of sources, various types and complex components. [0003] 137 As one of the most important fission product nuclides, Cs is widely used as a variety of radioactive sources due to its long half-life, high branching ratio, and moderate energy gamma ray...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): B01J20/06B01J20/30
Inventor游新锋张振涛
OwnerCHINA INSTITUTE OF ATOMIC ENERGY