Ceramic microsphere and preparation method thereof

A technology of ceramic microspheres and gel balls, which is applied in the field of ceramic molding, can solve problems such as the inability to realize the large-scale application of the internal gelation process, increase the cost of wastewater treatment, and reduce the output of ceramic microspheres, so as to achieve extended stability and lower mole Ratio limitation, good effect of sphericity

Active Publication Date: 2020-11-20
TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, due to the low concentration of urea, the amount of urea-formaldehyde resin produced by the reaction of urea and hexamethylenetetramine decomposition product-formaldehyde is also correspondingly reduced, and the overall support effect of urea-formaldehyde resin on the formed gel is also correspondingly weak, resulting in some Metal ions (such as uranium), it is difficult to form good gel balls by the above method, thereby reducing the yield of ceramic microspheres, and the large-scale application of the internal gelation process cannot be realized
[0004] In addition, in this method, organic solvents that are harmful to humans and the environment are used many times to wash the aged gel balls, which increases the cost of wastewater treatment

Method used

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  • Ceramic microsphere and preparation method thereof

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Embodiment 1

[0056] Embodiment 1 A kind of preparation method of ceramic microspheres (do not contain additive in the glue solution)

[0057] The present embodiment provides a kind of preparation method of ceramic microspheres, comprising:

[0058] (1) At room temperature, add 3 mol of hexamethylenetetramine and 3 mol of urea into deionized water and mix evenly to prepare a 1 L mixed solution to form the first mixed solution;

[0059] (2) Dissolve U3O8 in concentrated nitric acid at room temperature and add deionized water to prepare a 2.8M uranyl nitrate solution with a pH value of 1.8-2.2;

[0060] Take 5ml of the uranyl nitrate solution, add 1ml of complexing agent acetylacetone dropwise into the solution and mix evenly to form the second mixed solution;

[0061] (3) Take the first mixed solution and the second mixed solution and mix them uniformly at a volume ratio of 1:1 to form a third mixed solution to obtain the glue.

[0062] In the obtained glue solution: 1.4 mol / L of metal ion...

Embodiment 2

[0075] Embodiment 2 A kind of preparation method of ceramic microsphere (containing additive in the glue)

[0076] The present embodiment provides a kind of preparation method of ceramic microspheres, comprising:

[0077] (1) At room temperature, add 3 mol of hexamethylenetetramine and 3 mol of urea into deionized water and mix evenly to prepare a 1 L mixed solution to form the first mixed solution;

[0078] (2) Dissolve U3O8 in concentrated nitric acid at room temperature and add deionized water to prepare a 2.8M uranyl nitrate solution with a pH value of 1.8-2.2;

[0079] Dissolve 1.8g of glucose in 1ml of complexing agent acetylacetone, add 5ml of uranyl nitrate solution into the solution and mix evenly to form the second mixed solution;

[0080] (3) Take 6ml of the first mixed solution and mix them evenly with the second mixed solution at a volume ratio of 1:1 to form the third mixed solution to obtain the glue.

[0081] In the obtained glue solution: metal ion 1.4mol / L,...

Embodiment 3

[0092] Embodiment 3 A kind of preparation method of ceramic microspheres (glucose, carbon powder are contained in the glue solution)

[0093] The present embodiment provides a kind of preparation method of ceramic microspheres, comprising:

[0094] (1) At room temperature, add 3 mol of hexamethylenetetramine and 3 mol of urea into deionized water and mix evenly to prepare a 1 L mixed solution to form the first mixed solution;

[0095] (2) Dissolve U3O8 in concentrated nitric acid at room temperature and add deionized water to prepare a 2.8M uranyl nitrate solution with a pH value of 1.8-2.2;

[0096] Dissolve 1.8g of glucose in 1ml of complexing agent acetylacetone, add 5ml of uranyl nitrate solution into the solution and mix evenly to form the second mixed solution;

[0097] (3) Mix the 6ml of the first mixed solution with the second mixed solution in a volume ratio of 1:1 to form a third mixed solution;

[0098] (4) Add 0.17g of carbon powder to the above mixed solution, a...

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Abstract

The invention belongs to the technical field of ceramic molding, and particularly relates to a ceramic microsphere and a preparation method thereof. The ceramic microsphere is obtained from a glue solution through an internal gelation process, wherein the glue solution comprises metal ions, hexamethylenetetramine and urea, and the glue solution also comprises a complexing agent acetylacetone or aderivative thereof. By adding the complexing agent, the stability of the glue solution at normal temperature can be prolonged, the content of urea can be increased, more urea-formaldehyde resin is generated, the supporting effect is improved, the strength of the gel ball is improved, and the situation that the gel ball is broken or even broken in subsequent treatment is avoided. The obtained ceramic microsphere has the advantages of being uniform in size, good in sphericity degree and free of surface cracking, a nozzle is not blocked in the preparation process, the yield is high, and industrial large-scale production can be achieved. Besides, the non-ionic surfactant is adopted to replace an organic solvent in the prior art, so that the wastewater treatment cost is reduced, and the production environment is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of ceramic molding, and in particular relates to a ceramic microsphere and a preparation method thereof. Background technique [0002] CN104671797A discloses an internal gelation method for preparing ceramic microspheres in which the glue solution is stable at room temperature. In order to improve the normal temperature stability of the glue, the method controls the urea concentration at a relatively low level, wherein the molar ratio of the metal salt, hexamethylenetetramine and urea is 1:(1.1-1.3):(0.3-0.7). [0003] However, due to the low concentration of urea, the amount of urea-formaldehyde resin produced by the reaction of urea and hexamethylenetetramine decomposition product-formaldehyde is also correspondingly reduced, and the overall support effect of urea-formaldehyde resin on the formed gel is also correspondingly weak, resulting in some For metal ions (such as uranium), it is difficult to form ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/51C04B35/622C04B35/624C04B35/626C04B35/632C04B35/634
CPCC04B35/51C04B35/622C04B35/624C04B35/62695C04B35/632C04B35/63484C04B2235/606C04B2235/656C04B2235/6562C04B2235/6567C04B2235/658C04B2235/6582C04B2235/6583
Inventor 李建军马景陶赵兴宇郝少昌房勇汉黄治文邓长生刘兵
Owner TSINGHUA UNIV
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