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Process for preparing high-purity superfine zirconia by zirconium oxychloride

A technology of ultra-fine zirconia and zirconium oxychloride, which is applied in the direction of zirconia, can solve the problems of high equipment requirements, low product grade, and small specific surface area of ​​zirconia, and achieve low equipment requirements, high product grade, and high specific surface area. big effect

Inactive Publication Date: 2005-11-23
宜兴新兴锆业有限公司
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  • Abstract
  • Description
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Problems solved by technology

[0002] To prepare high-purity ultra-fine zirconia, the raw material requirements are very high. If it is prepared by zirconium oxychloride, high-purity zirconium oxychloride must be selected, and then burned and pulverized to obtain zirconia. The specific surface area of ​​zirconia is small, and hydrogen chloride overflows during burning, so anti-corrosion equipment is required, and gas must be recovered at the same time, the equipment requirements are high, and the product grade is low

Method used

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  • Process for preparing high-purity superfine zirconia by zirconium oxychloride

Examples

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Embodiment 1

[0017] Example 1, the production process of zirconium oxychloride to prepare high-purity ultra-fine zirconia, the manufacturing steps are:

[0018] 1) Purification by recrystallization. Dissolve industrial zirconium oxychloride in purified hydrochloric acid at 80-95°C with an acidity of 5.5-6.5N until the concentration of zirconium oxychloride in the solution is 160-220g / L in terms of zirconia, stir and cool to room temperature;

[0019] 2) coprecipitation reaction. Pass the recrystallized zirconium oxychloride solution into 4-6N purified ammonia water and stir until the pH reaches 8-9 and terminate;

[0020] 3) washing and filtering with pure water;

[0021] 4) Add Tween 20 emulsifier to the filter cake for emulsification and dispersion treatment, the weight ratio of the ingredients is zirconia: emulsifier = 100: 0.1-0.5, and the emulsification time is 10-20 minutes.

[0022] 5) The emulsified material is spray-dried to obtain a semi-finished powder;

[0023] 6) The semi-...

Embodiment 2

[0025] Embodiment 2, reference example 1, also add polyethylene glycol dispersant during co-precipitation reaction, add weight and be zirconia: polyethylene glycol=100: 0.1-0.5, the emulsification dispersant of emulsification dispersion process filter cake is Composition of Tween 60 and Tween 80.

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Abstract

Disclosed is a process for preparing high-purity superfine zirconia by zirconium oxychloride, which comprises recrystallization purifying, charging ammonia for sedimentation, obtaining zirconium hydroxide colloid that is easy for filtration and washing, after filtering and washing, charging minute quantity of emulsifying agent, carrying out high shearing emulsification and high-energy ball grinding, thus obtaining stable hydrated zirconium dioxide with good dispersity, then drying with spraying drying apparatus, calcining to obtain crude product of high purity ultra-fine zirconium dioxide, finally subjecting the crude product to high pressure disintegration.

Description

technical field [0001] The invention relates to a production process of high-purity ultrafine zirconia, in particular to a production process for preparing high-purity ultrafine zirconia by using zirconium oxychloride. technical background [0002] To prepare high-purity ultra-fine zirconia, the raw material requirements are very high. If it is prepared by zirconium oxychloride, high-purity zirconium oxychloride must be selected, and then burned and pulverized to obtain zirconia. The specific surface area of ​​zirconia is small, and due to the overflow of hydrogen chloride during burning, anti-corrosion equipment is required, and gas must be recovered at the same time, which requires high equipment and low product quality. Contents of the invention [0003] The present invention is just to overcome the above-mentioned shortcomings, and provides a production process for preparing high-purity ultrafine zirconia from zirconium oxychloride, which can obtain high-grade high-pur...

Claims

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Application Information

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IPC IPC(8): C01G25/02
Inventor 杨新民李福平宗俊峰
Owner 宜兴新兴锆业有限公司
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