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Method for producing nano zirconia

A technology of nano zirconia and production method, which is applied in the direction of zirconia, nanotechnology, nanotechnology, etc., can solve problems such as failure to meet user requirements, incomplete dehydration, powder agglomeration, etc., and achieve easy control of the reaction process, convenient implementation, High safety effect

Inactive Publication Date: 2010-04-28
ZIBO GUANGTONG CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The nucleation rate of the precipitation reaction process is mainly based on the degree of supersaturation, so the above requirements cannot be met in an ordinary stirred tank; the second is that the traditional dehydration drying method is not completely dehydrated, resulting in agglomeration of the powder; the third is the traditional ball milling method , due to the limitation of objective conditions, the minimum particle size of the product after ball milling is d50<0.8μm, which cannot meet user requirements

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Zirconium oxychloride is configured into a 0.5 molar concentration solution, and the weight concentration is 25% ammonia water as the alkaline precipitant. The molar ratio of ammonia to zirconia is controlled at 6:1, and the pressure of the two solutions reaches 0.1mp by pressurization to 10mp, and the flow rate reaches between 1m / s and 80m / s for mixing reaction to obtain zirconium hydroxide precipitate, filter and wash the filter cake with deionized water until no chloride ion can be detected. Mix the washed filter cake with the above-mentioned alcohol in a volume ratio of 1:2, stir and heat up to 160-220° C., and perform dehydration and drying to obtain anhydrous zirconium hydroxide powder. The anhydrous zirconium hydroxide powder is calcined in a calciner, the calcining temperature is controlled at 700-1300° C., and the calcining time is 2-4 hours to obtain white zirconia powder. The zirconia powder is then wet-milled, and the wet-milling medium is a mixture of alcoh...

Embodiment 2

[0017] Zirconium oxychloride is configured into a 0.5 molar concentration solution, and the weight concentration is 25% ammonia water as the alkaline precipitant. The molar ratio of ammonia to zirconia is controlled at 6:1, and the pressure of the two solutions reaches 0.1mp by pressurization to 10mp, and the flow rate reaches between 1m / s and 80m / s for mixing reaction to obtain zirconium hydroxide precipitate, filter and wash the filter cake with deionized water until no chloride ion can be detected. Mix the washed filter cake with the above-mentioned alcohol in a volume ratio of 1:2, stir and heat up to 160-220° C., and perform dehydration and drying to obtain anhydrous zirconium hydroxide powder. The anhydrous zirconium hydroxide powder is calcined in a calciner, the calcining temperature is controlled at 700-1300° C., and the calcining time is 2-4 hours to obtain white zirconia powder. The zirconia powder is then wet-milled, and the wet-milling medium is a mixture of alcoh...

Embodiment 3

[0019] Zirconium oxychloride is configured into a 0.5 molar concentration solution, and the weight concentration is 25% ammonia water as the alkaline precipitant. The molar ratio of ammonia to zirconia is controlled at 6:1, and the pressure of the two solutions reaches 0.1mp by pressurization to 10mp, and the flow rate reaches between 1m / s and 80m / s for mixing reaction to obtain zirconium hydroxide precipitate, filter and wash the filter cake with deionized water until no chloride ion can be detected. Mix the washed filter cake with the above-mentioned alcohol in a volume ratio of 1:2, stir and heat up to 160-220° C., and perform dehydration and drying to obtain anhydrous zirconium hydroxide powder. The anhydrous zirconium hydroxide powder is calcined in a calciner, the calcining temperature is controlled at 700-300°C, and the calcining time is 2-4 hours to obtain white zirconia powder. The zirconia powder is then wet-milled, and the wet-milling medium is a mixture of alcohol ...

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Abstract

The invention relates to a method for producing nano zirconia, and belongs to the technical field of fine chemical engineering. The method comprises the following steps: reacting aqueous solution of zircon salt with an alkaline precipitator to form zirconium hydroxide precipitate; and filtering, washing, dehydrating, drying, and sintering the zirconium hydroxide precipitate to obtain zirconia powder. The method is characterized in that: the aqueous solution of zircon salt and the alkaline precipitator are respectively subjected to high pressure to form high speed fluid for jet mixing reaction to form the zirconium hydroxide precipitate. The method is scientific and reasonable, is convenient to implement, and can produce the nano zirconia meeting quality requirement.

Description

technical field [0001] The invention relates to a production method of nano zirconia, which belongs to the technical field of fine chemicals. Background technique [0002] At present, the production quality of nano-zirconia is not up to standard, it can be said that it cannot reach the nanometer level, it can only be regarded as micro-powder, which directly cannot meet the quality requirements of the electronic industry for nano-zirconia. To produce nano-sized zirconia, further improvements are needed to meet the needs of the electronics industry. [0003] In the production of zirconia, the traditional chemical precipitation production process is carried out in an ordinary stirred tank, and the energy dissipation rate is unevenly distributed in the reactor space, causing uneven microscopic mixing and rate distribution. For the rapid reaction precipitation process, microscopic mixing is the key factor that determines the degree of supersaturation and the uniformity and distr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G25/02B82B3/00
Inventor 向柠杨光耀王延军王淑占周翠翠赵杰
Owner ZIBO GUANGTONG CHEM
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