Preparing method of inorganic cesium selective absorbent

A selective and adsorbent technology, which is applied in the field of separation and treatment of radioactive waste liquid, can solve the problems of fine particles that cannot be used for column operation, harsh process conditions, poor hydrolysis stability, etc., and achieve good radiation resistance and thermal stability, Good hydrolytic stability and the effect of increasing the flow rate

Active Publication Date: 2013-07-10
CHINA INSTITUTE OF ATOMIC ENERGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, it is easy to enter the environment
(3) 137 Cs is a moderately radiotoxic nuclide, which is very harmful to humans.
At present, most of the inorganic ion exchangers commonly used in the world are natural materials such as zeolites. 137 Cs selectivity is poor, Kd value is only about 100ml / g, and it is greatly affected by pH
In addition, there are also some artificially synthesized adsorbents, but most of them have poor hydrolytic stability, the particles are too fine for column operation, etc., and the preparation methods are complicated and the process conditions are harsh, so they are rarely used in practice.

Method used

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  • Preparing method of inorganic cesium selective absorbent
  • Preparing method of inorganic cesium selective absorbent
  • Preparing method of inorganic cesium selective absorbent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The preparation method of this inorganic cesium selective adsorbent is specifically as follows: use analytically pure K 4 Fe(CN) 6 ·6H 2 O to prepare 0.3mol / L K 4 Fe(CN) 6 -1.8×10 -3 mol / L CH 3 COOH solution. Take 100mL 0.3mol / L K 4 Fe(CN) 6 -1.8×10 -3 mol / L CH 3Put the COOH solution in a 400mL beaker, place the beaker in an ice-water bath, and add 0.5mol / L Ni(NO 3 ) 2 Solution 240mL, while adding the solution dropwise, use a stirrer to stir at 800±50rpm. After the reaction, continue to stir for 10-15min, then take out the beaker, place it at 110°C for about 2h to coagulate and settle the colloid, and pour off the supernatant . Then, transfer to a suction filter crucible for suction filtration, then wash with deionized water, then suction filter, repeat suction filtration-washing 3 to 4 times, and finally dry the precipitate at 110°C to obtain KNiFC adsorbent .

[0030] Accurately weigh 0.1081g of the above-mentioned adsorbent in a 15mL centrifuge tube, th...

Embodiment 2

[0038] Concrete operation is as embodiment 1. The specific operation is as follows: use analytically pure K 4 Fe(CN) 6 ·6H 2 O to prepare 0.1mol / L K 4 Fe(CN) 6 -1.0×10 -3 mol / L CH 3 COOH solution. Take 100mL 0.1mol / L K 4 Fe(CN) 6 -1.0×10 -3 mol / L CH 3 Put the COOH solution in a 400mL beaker, place the beaker in a water bath at 3°C, and add 0.1mol / L Ni(NO 3 ) 2 Solution 600mL, while adding the solution dropwise, use a stirrer to stir at 800±50rpm. After the reaction, continue to stir for 15-20min, then take out the beaker, place it at 120°C for about 2h to allow the colloid to coagulate and settle, and pour off the supernatant . Then, transfer to the suction filter crucible for suction filtration, then wash with deionized water, then suction filtration, repeat suction filtration-washing 3 to 4 times, and finally dry the precipitate at 120°C to obtain KNiFC adsorbent .

Embodiment 3

[0040] Concrete operation is as embodiment 1. The specific operation is as follows: use analytically pure K 4 Fe(CN) 6 ·6H 2 O to prepare 0.5mol / L K 4 Fe(CN) 6 -2.0×10 -3 mol / L CH 3 COOH solution. Take 100mL 0.5mol / L K 4 Fe(CN) 6 -2.0×10 -3 mol / L CH 3 Put the COOH solution in a 400mL beaker, place the beaker in a water bath at 5°C, and add 0.8mol / L Ni(NO 3 ) 2 Solution 187.5mL, while adding the solution dropwise, use a stirrer to stir at 800±50rpm. After the reaction, continue to stir for 15-20min, then take out the beaker, and place it at 100°C for about 2h to coagulate and settle the colloid, and pour off the supernatant liquid. Then, transfer to the suction filter crucible for suction filtration, then wash with deionized water, then suction filtration, repeat suction filtration-washing 3 to 4 times, and finally dry the precipitate at 100°C to obtain KNiFC adsorbent .

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Abstract

The invention provides a preparing method of an inorganic cesium selective absorbent. The method comprises the following steps: slowly adding a Ni(NO3)2 solution into a K4Fe(CN)6-CH3COOH solution; reacting for a period of time after completely adding the solution; after ending the reaction, standing still for settling and removing supernatant; and finally, filtering, washing and depositing, and drying at 110 DEG C till the weight is constant. The preparing method has the advantages that the steps are few, the process is simple, the industrial production is conveniently realized, the compounded absorbent is a pure inorganic material, the Cs partition coefficient is very high, the selectivity is excellent, the exchange speed is very high, the balancing time is less than 1 hour, the exchangecapacity is high, the anti-irradiation property and the thermal stability are excellent, the hydrolysis stability is excellent, the column operation and the magnetic separation can be performed, and the method is suitable for the treatment of all types of low-discharge Cs-containing waste water.

Description

technical field [0001] The invention belongs to the field of separation and treatment of radioactive waste liquid, and in particular relates to a preparation method of an inorganic cesium selective adsorbent. Background technique [0002] In 2005, my country's "National Nuclear Power Medium and Long-Term Development Plan" (hereinafter referred to as "Plan") determined that by 2020, the proportion of China's nuclear power will increase from less than 2% at present to more than 4%, and it is planned that by 2020, the national nuclear power installed capacity will reach 40 million kilowatts. The installed capacity under construction is 18 million kilowatts. It is estimated that a 1000MWe nuclear power unit will process about 1500m 3 low-level waste water, so it is estimated that by 2020, the national nuclear power plants will produce 1500×80=1.2×10 5 m low level waste liquid. In addition, there is still a large amount of military nuclear waste liquid in our country. my count...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/04B01J20/30C02F1/28
Inventor 张振涛游新锋马辉王雷白杨梁显源
Owner CHINA INSTITUTE OF ATOMIC ENERGY
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