Preparation method for nuclear grade concentrated 10B zirconium diboride powder and target

A nuclear-grade zirconium diboride technology, which is applied in the field of nuclear-grade concentrated 10B zirconium diboride powder and target preparation, can solve the problems of high difficulty in hot pressing sintering, low raw material cost, and high boron loss rate. Achieve the effect of saving production input cost, reducing raw material cost and improving utilization rate

Inactive Publication Date: 2015-12-02
NUCLEAR POWER INSTITUTE OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the prior art preparation suitable for nuclear grade ZrB 2 target ZrB 2 In the powder process, its raw materials are concentrated 10 B's BC 4 The problem of high price, high boron loss rate, and difficulty in hot-pressing sintering when used to make targets provides a low-cost raw material, effectively reduces boron loss rate, simple process and is suitable for the preparation of nuclear-grade ZrB 2 A Nuclear Level Enrichment of Targets 10 The preparation method of B zirconium diboride powder; The present invention also provides the use of this nuclear grade enrichment 10 Preparation of nuclear grade ZrB from B zirconium diboride powder 2 A Nuclear Level Enrichment of Targets 10 Preparation method of B zirconium diboride target

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] First, prepare a nuclear grade enrichment 10 B Zirconium diboride powder, the specific preparation method is as follows:

[0033] (1) Dissolve 72 parts of sucrose and 65 parts of boric acid in 250 parts of distilled water according to mass fraction in a water bath at 80℃, and record as A solution; dissolve 110 parts of dehafnium zirconyl oxynitrate in another 250 parts of distilled water, record For B solution. Add solution B to solution A, stir to form a sol, then add concentrated ammonia to adjust the pH to 2, and heat it for a period of time to become an orange transparent gel. The orange gel was dried at 100°C and then ground into powder to obtain a precursor. Boric acid 10 The abundance of B element is 70%.

[0034] (2) Put the precursor into the stone crucible of the induction furnace, fill it with argon as a protective atmosphere, synthesize at a high temperature to 1350℃, keep it for 2h, stop heating, and get rich after the furnace cools. 10 Zirconium diboride ultr...

Embodiment 2

[0043] The difference between this embodiment and embodiment 1 is only that the composition of the A solution and the B solution in the step (1) are different. In this embodiment, the A solution is composed of 80 parts of sucrose and 70 parts of boric acid dissolved in 250 parts of distilled water. The B solution is composed of 115 parts of dehafnium zirconyl nitrate mixed with 250 parts of distilled water.

[0044] After testing, the ZrB made in this example 2 ZrB in target 2 The density is 91%.

Embodiment 3

[0046] First, prepare a nuclear grade enrichment 10 B Zirconium diboride powder, the specific preparation method is as follows:

[0047] (1) According to mass fraction, 160 parts of citric acid and 60 parts of boric acid are dissolved in 250 parts of distilled water in a water bath at 80℃, which is recorded as A solution; 80 parts of dehafnium zirconium oxychloride are dissolved in another 250 parts of distilled water, Recorded as B solution. Add solution B to solution A, stir to form a sol, then add 35 parts of hexamethylenetetramine, and heat for a period of time to turn into an orange transparent gel. The orange gel was dried at 100°C and then ground into powder to obtain a precursor. The boric acid 10 The abundance of B element is 40%.

[0048] (2) Put the precursor into the stone crucible of the induction furnace, fill it with argon gas as a protective atmosphere, synthesize at a high temperature to 1350℃, keep it for 2h, stop heating, and get rich after cooling with the fur...

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PUM

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Abstract

The invention discloses a preparation method for nuclear grade concentrated 10B zirconium diboride powder and a target and mainly solves the problem that in the ZrB2 powder preparation process in the prior art, the raw material concentrated 10B BC4 is expensive, great in boron loss rate and great in hot-pressing and sintering difficulty for manufacturing the target. The preparation method comprises: (1) by taking nuclear grade hafnium-free zirconyl nitrate as a zirconium source and concentrated 10B-enriching boric acid as a boron source, preparing a gel by using a sol-gel method, and heating, drying and grinding the gel into powder to prepare a precusor; and (2) by adopting argon as a protective atmosphere, and synthesizing the precusor at a high pressure by using a carbon heat reduction method to obtain the 10B-enriching zirconium diboride ultrafine powder, wherein the elemental abundance of 10B in the boric acid in the step (1) is 30-70%. The invention further discloses a method for preparing nuclear grade ZrB2 target by using the concentrated 10B zirconium diboride powder. The method disclosed by the invention has the advantages of being low in cost of raw materials, effectively reducing the boron loss rate and being simple in process and suitable for preparing the nuclear grade ZrB2 target and the like.

Description

Technical field [0001] The invention relates to a nuclear material manufacturing process technology, in particular to a nuclear-level enrichment 10 B. Preparation method of zirconium diboride powder and target. Background technique [0002] After the Fukushima nuclear power accident in Japan, the safety of nuclear power has become a key factor restricting the development of nuclear power. In China, the third-generation nuclear power technology AP1000 with passive and safe design has undoubtedly taken the lead in my country's future nuclear power development and has become the main reactor type. The fuel for the above AP1000 reactor type is ZrB 2 -IFBA fuel. [0003] ZrB 2 -IFBA is a new type of combustible poison fuel. Compared with other types of combustible poisons, it has the advantages of excellent nuclear performance, flexible configuration, low residual toxicity, improved water-side corrosion chemical environment, and good economy. [0004] ZrB 2 -IFBA fuel is in UO 2 The out...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B35/04
Inventor 喻冲杨静徐奎潘小强张良段盼盼陈蓉刘廷伟
Owner NUCLEAR POWER INSTITUTE OF CHINA
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