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A method for preparing stable zirconia ultrafine powder by non-aqueous precipitation method

A technology for stabilizing zirconia and ultra-fine powder, applied in zirconia and other directions, can solve the problems of high wastewater treatment cost and particle agglomeration, and achieve the effects of reducing the pressure of safety assessment and environmental assessment, overcoming agglomeration, and reducing costs

Active Publication Date: 2017-03-22
JINGDEZHEN CERAMIC INSTITUTE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

One is to use water as a solvent. Due to the high surface tension of water, a large capillary force will be generated during the drying and dehydration process of the sediment, which will easily lead to particle agglomeration, and the hydroxyl contained in the sediment will be absorbed by the heat treatment process. Removal in the form of water: hard agglomeration occurs; second, multiple washings are required to remove chlorine. It takes more than 100 tons of water to prepare 1 ton of zirconia powder, and the cost of wastewater treatment is very high

Method used

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  • A method for preparing stable zirconia ultrafine powder by non-aqueous precipitation method

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Effect test

Embodiment 1

[0020] 20 g zirconium tetrachloride (ZrCl 4 ), 0.53 g of metal yttrium powder was added to 100 ml of absolute ethanol, heated and stirred until the precursor was completely dissolved to form a bright yellow precursor mixture. at 0.5 mL / s cm 2 Spray 36 mL of triethanolamine at the speed of 4 React with the stabilizer precursor to form crystal precipitates insoluble in low-carbon alcohols, age at 80°C for 24 h, remove and recover the solvent by pressure filtration, and heat-treat the precipitates at 900°C to obtain stable zirconia ultrafine powders.

Embodiment 2

[0022] Change 0.53 g metal yttrium powder in Example 1 to 0.29 g calcium powder, change 100 ml absolute ethanol to 80 mL absolute isopropanol, change 36 mL triethanolamine to 21 mL anhydrous formic acid, 0.5 mL / s cm 2 Change the speed to 5mL / s·cm 2 , the press filter was changed to centrifugation, the heat treatment temperature was changed to 750° C., and other conditions were the same as in Example 1, finally a stable zirconia ultrafine powder was obtained.

Embodiment 3

[0024] Change the 0.53 g metal yttrium powder in Example 1 to 0.92 g yttrium ethylate, 36 mL triethanolamine to 36 mL anhydrous propionic acid, change pressure filtration to suction filtration, and change the heat treatment temperature to 1150 ° C, and other conditions are the same as in Example 1. In the same way, stable zirconia ultrafine powder is finally obtained.

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Abstract

The invention discloses a method for preparing stable zirconia ultrafine powder through a novel non-water-precipitation method. Zirconium tetrachloride serves as a source of zirconium, anhydrous low alcohol serves as a solvent, stabilizer is added, precursor mixed liquid is prepared, anhydrous lower alcohol organic amine or acid is injected into a system to serve as a precipitation agent, the organic amine or acid reacts with zirconium tetrachloride and stabilizer precursors, crystalline precipitate which cannot be dissolved in lower alcohol is generated and ages, precipitated slurry is first removed, the solvent is recycled, the precipitate is finally subjected to thermal treatment, and the stable zirconia ultrafine powder is obtained. By means of the method, a preparation technology of the zirconia ultrafine powder is greatly simplified, and environment assessment and safety assessment pressure of solvent recycling are greatly reduced in the later precipitate drying process in the mode that the crystalline precipitate is formed; a dehydration step and a dechlorination step are not needed; the agglomeration phenomenon generated when water serves as a solvent is effectively avoided, the solvent can be recycled and reused, the raw material utilizing rate is increased, the water washing process is also omitted, and the serious environment pollution problem caused by waste water discharge is fundamentally solved.

Description

technical field [0001] The invention relates to the technical field of ceramic powder preparation, in particular to a method for preparing stable zirconia ultrafine powder by a novel non-aqueous precipitation process. Background technique [0002] Zirconia material has the advantages of high melting point, high strength, wear resistance and high toughness, and also has excellent heat insulation performance, its thermal expansion coefficient is close to steel, good chemical stability, etc., especially its high temperature strength, toughness It has excellent corrosion resistance and is a commonly used structural and functional material in the field of modern industrial technology. In addition, zirconium dioxide is a metal oxide with acidity, alkalinity, oxidation and reduction, and has important application value in catalysts, catalyst supports, industrial synthesis and special ceramics. Zirconia powder is an important raw material for the preparation of zirconia materials, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G25/02
CPCC01G25/02
Inventor 冯果徐贵荣张权江伟辉刘健敏苗立锋吴倩
Owner JINGDEZHEN CERAMIC INSTITUTE