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Method for removing Cl <-> in zirconium oxide powder

A technology of zirconia powder and zirconium salt is applied in the field of preparation of zirconia ceramic powder, which can solve the problems of large water consumption and hard agglomeration of powder.

Active Publication Date: 2021-05-18
ZHEJIANG JINKUN ZIRCONIUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention provides a method for removing Cl in zirconia powder - method to solve the problem of removing Cl in the powder in the existing process - The time consumption is large, the powder is hard to agglomerate, etc.

Method used

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  • Method for removing Cl &lt;-&gt; in zirconium oxide powder
  • Method for removing Cl &lt;-&gt; in zirconium oxide powder
  • Method for removing Cl &lt;-&gt; in zirconium oxide powder

Examples

Experimental program
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Effect test

Embodiment 1

[0035] First prepare 2000L of 2mol / L zirconium oxychloride solution with deionized water as the solvent, and add 3mol% yttrium oxide into the solution, while stirring and heating to 75°C, so that the zirconium salt is fully dissolved in water, and a clear Acidic zirconium oxychloride solution, cooled to room temperature and filtered for use; then configure ammonia solution with the same concentration as the zirconium salt solution, cooled to room temperature for use; based on the precipitation method, slowly carry out the zirconium oxychloride solution and ammonia solution and then adjust the pH value of the solution to be about 7.5, then continue to add ammonia solution, adjust the pH value to 9.5, then stir for 30 minutes, and leave to stand to obtain a slurry; then repeatedly wash the prepared slurry with water 3 times, At this time, Cl in the slurry － The content is 430ppm, and then the slurry is made into a filter cake by means of pressure filtration, and then the filter ...

Embodiment 2

[0038] First prepare 2000L of 2mol / L zirconium carbonate solution with deionized water as the solvent, and add 3mol% yttrium oxide into the solution, stir and heat to 55°C at the same time, so that the zirconium salt is fully dissolved in water, and a clear acidic carbonate solution is obtained. Zirconium solution, cooled to room temperature and filtered for use; then configure ammonia solution with the same concentration as the zirconium salt solution, cooled to room temperature for use; based on the precipitation method, slowly mix the zirconium carbonate solution and ammonia solution to adjust the solution The pH value is about 7.0, continue to add ammonia solution, adjust the pH value to 9, then stir for 30min, and make the slurry after standing; then the prepared slurry is repeatedly washed with water 4 times, at this time, the Cl in the slurry － The content is 388ppm, and then the slurry is made into a filter cake by means of pressure filtration, and then the filter cake ...

Embodiment 3

[0040] First prepare 2000L of 2mol / L zirconium nitrate solution with deionized water as a solvent, and add 8mol% yttrium oxide into the solution, while stirring and heating to 65°C, so that the zirconium salt is fully dissolved in water, and clear acidic nitric acid is obtained Zirconium solution, cooled to room temperature and filtered for use; then configure an ammonia solution with the same concentration as the zirconium salt solution, and cool to room temperature for use; based on the precipitation method, slowly mix the zirconium nitrate solution and ammonia solution to adjust the solution The pH value of the solution is about 7.2, continue to add ammonia solution, adjust the pH value to 9.6, then stir for 38min, and make a slurry after standing (that is, colloidal hydroxide precipitation); then the prepared slurry is washed with water repeatedly 3 times, at this time the Cl in the slurry － The content is 422ppm, and then the slurry is made into a filter cake by means of ...

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Abstract

The invention relates to the field of zirconium oxide ceramic powder preparation, in particular to a method for removing Cl <-> in zirconium oxide powder, which is characterized by comprising the following steps: S1, putting zirconium salt into water, stirring and heating to prepare a zirconium salt solution; s2, mixing the zirconium salt solution and ammonia water, adjusting the pH value to 7-7.5, continuously adding the ammonia water solution, adjusting the pH value of the solution to 9-10, and stirring the mixture to prepare slurry; s3, washing the slurry until the content of Cl <-> in the slurry is lower than 300ppm, and then carrying out filter pressing to obtain a filter cake; s4, calcining the filter cake to obtain calcined powder; and S5, mixing the calcined powder with a hot acid solution, carrying out ball milling and sand milling, carrying out spray granulation, and sieving the granules to obtain the zirconium oxide powder. According to the method, hot acid is added during ball milling of the calcined powder to break the acid-base balance of a solution, so that the powder is further cleaned, the content of Cl <-> in the powder is reduced, and hard agglomeration of the powder can be obviously reduced; therefore, the purity, sintering activity and the like of the powder can be improved, the permeability probability of parts made of the powder can be obviously improved, the sintering temperature can be reduced, and the cost can be saved.

Description

【Technical field】 [0001] The invention belongs to the technical field of preparation of zirconia ceramic powder, in particular to a method for removing Cl in zirconia powder - Methods. 【Background technique】 [0002] Zirconium dioxide is the only metal oxide with acidic, basic, oxidizing and reducing properties at the same time. As a P-type semiconductor, it not only supports and disperses the active components in the catalyst, but also interacts with the active components of the catalyst. Parts produce unique interactions, and have great application value in industrial synthesis, catalysts, catalyst carriers, and special ceramics. Zirconium dioxide particles have unique physical and chemical properties and are a new type of high-performance inorganic material. At present, the preparation methods of zirconium dioxide include chemical precipitation method, sol-gel method, hydrothermal method, microemulsion method, reverse micellar method, spray method and so on. Precipitat...

Claims

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Application Information

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IPC IPC(8): C04B35/48C04B35/626
CPCC04B35/48C04B35/62605C04B2235/3246
Inventor 王林芳胡法卿范宇升
Owner ZHEJIANG JINKUN ZIRCONIUM IND
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