Production method of nuclear-grade zirconium dioxide

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...

AI Technical Summary

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

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