Adsorbent and preparation method thereof

An adsorbent and binder technology, applied in the field of adsorbent and its preparation, can solve the problems of complicated preparation process, equipment corrosion, small specific surface area of ​​adsorbent, etc., and achieve the effect of simple preparation method

Inactive Publication Date: 2017-05-17
SHANGHAI INST OF APPLIED PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims to overcome the disadvantages of the prior art such as small specific surface area of ​​adsorbent, cumbersome preparation process, serious equipment corrosion, etc., and provides an adsorbent and its preparation method

Method used

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  • Adsorbent and preparation method thereof
  • Adsorbent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] according to figure 1 In the process flow shown, 1.00g of cerium trifluoride is added to 15.84g of sodium fluoride powder, and mixed thoroughly to obtain a mixture; then 1g of sodium carboxymethylcellulose is weighed, and added to the mixture to mix, Then gradually add 5ml of water, and keep stirring and kneading during the addition of water, and finally form a dough. Put the dough into the screw extruder and extrude into strips, then cut into The particles are put into the muffle furnace for sintering, the sintering temperature is 800 ℃, and the heat preservation is 2h, and the adsorbent is obtained, and its specific surface area is 0.80m 2 / g, its X-ray diffraction pattern (XRD pattern) such as figure 2 shown.

[0029] figure 2 Among them, a represents the XRD pattern of the adsorbent made in Example 1; b represents the standard XRD pattern of sodium fluoride crystals in the XRD standard library (JCPDs), and the numbering is 70-2508; c represents the cerium dio...

Embodiment 2

[0031] Add 3.75g of cerium trifluoride to 15.20g of sodium fluoride powder, mix thoroughly to obtain a mixture; then weigh 1g of sodium carboxymethylcellulose, add it to the mixture and mix, then gradually add 8ml of water, And keep stirring and kneading during the addition of water, and finally form a dough. Put the dough into the screw extruder and extrude into strips, then cut into The particles are put into the muffle furnace for sintering, the sintering temperature is 750°C, and the heat preservation is 2h, the adsorbent is obtained, and its specific surface area is 0.85m 2 / g.

[0032] There is almost no difference between the XRD pattern of the adsorbent prepared in Example 2 and Example 1 by X-ray diffraction.

[0033] Compared with the specific surface area of ​​pure sodium fluoride adsorbent, the specific surface area of ​​the adsorbent in the present invention is significantly improved. The improvement of the specific surface area in this field is generally condu...

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Abstract

The invention discloses an adsorbent and a preparation method thereof. The adsorbent comprises, by mass, 70 to 99% of sodium fluoride and 1 to 30% of cerium oxide. The adsorbent in the invention has a large specific surface area, the preparation method of the adsorbent is simple, and obvious equipment corrosion during the preparation process is avoided.

Description

technical field [0001] The invention relates to an adsorbent and a preparation method thereof. Background technique [0002] Uranium fluoride volatilization technology is a dry separation technology that utilizes the volatility difference of different element fluorides to obtain high-purity uranium quickly and efficiently. In this separation process, UF 6 Purification (removal of volatile fission product fluoride) is a key step. One of the main methods of purification is adsorption and desorption, that is, the use of fluoride adsorption materials based on alkali metals and alkaline earth metals at specific temperatures for different volatile metal fluorides. The adsorption and desorption characteristics of the compound realize the UF 6 purification. [0003] Currently used for fluorinated volatile UF 6 The purified adsorbent is mainly sodium fluoride adsorbent, which has some defects due to the difference in raw material selection and preparation methods, such as small s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/06B01J20/28B01J20/30C22B60/02B01D53/02
CPCB01D53/02B01J20/046B01J20/06B01J20/28B01J20/28059B01J2220/42B01J2220/4806C22B60/0213
Inventor 李洒洒李杨娟程治强窦强李晴暖
Owner SHANGHAI INST OF APPLIED PHYSICS - CHINESE ACAD OF SCI
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