Production method of nuclear-grade zirconium dioxide

A zirconium dioxide, production method technology, applied in the directions of zirconium oxide, chemical instruments and methods, preparation of zirconium compounds, etc., can solve the problems of difficulty in Zr stripping, environmental pollution, decline in equipment production capacity, etc., and achieve stable and reliable product quality. , The effect of high extraction separation factor and simple process flow

Pending Publication Date: 2021-04-30
中核二七二铀业有限责任公司
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Problems solved by technology

It is well known that a solution with strong acidity will severely corrode equipment; at the same time, due to extraction and separation in a high-acid environment, TBP is easily degraded into DBP, and DBP and NO 3 - The reaction generates a complex that is prone to emulsification, which leads to difficulties in the stripping of Zr, reduces the yield, and reduces the production capacity of the equipment
Also, for highly acidic solutions, especially for 3 +HCl mixed acid extraction stock solution, it is difficult to recycle the waste liquid, it can only be neutralized by adding alkali, and discharged after reaching the standard, otherwise it will cause serious pollution to the environment

Method used

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  • Production method of nuclear-grade zirconium dioxide

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Embodiment Construction

[0049] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0050] A production method of nuclear grade zirconia, comprising the steps of:

[0051] Step 1, preparation of extraction stock solution

[0052] Zirconium oxychloride (ZrOCl 2 ·8H 2 O) adding industrial hot water (or washing water) to dissolve, the solution is added to liquid caustic soda to neutralize the precipitate, and then filtered and washed to obtain a white colloidal precipitate; the concentrated nitric acid is used to dissolve the precipitate to ob...

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Abstract

The invention belongs to the technical field of nuclear material production and manufacturing, and particularly relates to a production method of nuclear-grade zirconium dioxide, which comprises the following steps: step 1, preparing an extraction stock solution, step 2, conducting fractionating and extracting for separating zirconium and hafnium, step 3, producing zirconium dioxide, and step 4, treating and recycling process waste liquid. According to the method, qualified nuclear-grade zirconium and hafnium products are obtained through one-time extraction separation; and no toxic reagent is adopted in the production process, and waste water and waste gas generated in the production process are treated and then returned for use or harmlessly discharged.

Description

technical field [0001] The invention belongs to the technical field of nuclear material production and manufacturing, and in particular relates to a production method of nuclear grade zirconia. Background technique [0002] Both zirconium and hafnium are rare metals with high melting points and belong to IV in the periodic table B family, due to their similar outer electron structures (Zr:4D 2 5S 2 ,Hf:5D 2 6S 2 ), especially affected by the contraction of lanthanides, their atomic radius, ionic radius, and crystal structure are very close, so they behave very similar in chemical properties. In nature, zirconium and hafnium always co-exist together. There is no separate zirconium or hafnium ore. Generally, zirconium ore contains 2-6% hafnium, so zirconium and hafnium must be separated. However, the very similar chemical behavior of zirconium and hafnium makes it very difficult to separate each other. Zirconium and hafnium are recognized as one of the most difficult meta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G25/02C01D9/00C01G27/00
CPCC01G25/02C01G25/003C01D9/00C01G27/003C01P2006/80
Inventor 黄召周密孔冬成龚道坤尹亮黄代富谢凌峰蒋树武曾中贤任新辉张恒钟华围肖维周少明
Owner 中核二七二铀业有限责任公司
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