Preparation method of uranium and impurity element standard substances in triuranium octaoxide

A technology of three uranium octaoxide and impurity elements, which is applied in the field of standard substance preparation, can solve problems such as complex process flow, long preparation time, and pollution of fixed-value elements, and achieve the effects of good process controllability, convenient preparation, and reduced pollution

Active Publication Date: 2019-03-08
BEIJING RESEARCH INSTITUTE OF CHEMICAL ENGINEERING AND METALLURGY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the types of fixed value elements of the existing U3O8 standard substance are relatively small, and some impurity elements only give reference values. The U3O8 standard substance GBW04242 and GBW04242 with the most types of fixed value elements have only 20 kinds (without U, Ti, V, W, Nb, Sb, Pb and other natural uranium dioxide technical indicators require limit value elements), some impurity elements (such as K, Na, Th, Ti, Mo, Al, Zn, Ca, Mg) fixed value level and At this stage, the actual impurity content of uranium dioxide products produced in my country varies greatly, and none of them has any +4 The fixed value with the total carbon TC cannot play a good role in value transfer and quality control in the production process of uranium dioxide
[0004] The preparation of U3O8 reference material mainly adopts synthetic matrix method and natural matrix method. The synthetic matrix method is to use purified high-concentration uranium-containing solution as raw material, add the required definite value element solution to the uranium-c

Method used

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  • Preparation method of uranium and impurity element standard substances in triuranium octaoxide
  • Preparation method of uranium and impurity element standard substances in triuranium octaoxide
  • Preparation method of uranium and impurity element standard substances in triuranium octaoxide

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preparation example Construction

[0041] A method for preparing standard substances of uranium and impurity elements in triuranium 8 oxide, comprising the following steps:

[0042] Step 1. Fully dissolving the raw material of uranium octaoxide with MOS grade nitric acid to ensure the complete reaction, and obtain a uranyl nitrate solution with a uranium concentration of 500 g / L;

[0043] Step 2: Prepare a solution of fixed value elements, select high-purity metals, oxides or salts without other metals for preparation, the water used is high-purity water, the acid used is MOS grade, the sodium hydroxide is excellent grade pure, and the measuring instruments used are all After verification, the preparation process meets the requirements of the "National Standard for Measurement of Standard Substances";

[0044] Step 3: Filter the uranyl nitrate solution obtained in Step 1 to remove solid insolubles, and measure Si, Fe, K, Na, Th, Pb, Ti, Mo, Cr, Al, Zn, B, Bi, Cd, V, W, Ca, Ni, Mg, Mn, Cu, Zr, Sb, Nb, Ag, Sn el...

Embodiment 1

[0089] Prepare 25 kg of uranium and impurity elements in uranium octaoxide in the analysis of standard materials, the amount of elements to be determined and the expected relative synthetic uncertainty are shown in Table 1-1:

[0090] Table 1-1 Quantity (μg / gU) of undetermined elements and expected relative combined uncertainty (%)

[0091]

[0092] 1 material dissolved

[0093] 1.1 Material selection

[0094] The uranium 8 oxide mineral material of a uranium mining enterprise was selected as the raw material, and its undetermined value content is shown in Table 1-2 below.

[0095] Table 1-2 Element content of undetermined values ​​of raw materials for preparation of UO3O8 candidates

[0096]

[0097] It can be seen from the table that the content of undetermined value elements in the raw materials are all lower than the quantitative value, which meets the technological requirements.

[0098] 1.2 Dissolution

[0099] Considering the preparation process and the sample...

Embodiment 2

[0128] Prepare 25 kg of uranium and impurity elements in uranium octaoxide in the analysis of standard materials, the amount of elements to be determined and the expected relative synthetic uncertainty are shown in Table 1-1:

[0129] Table 1-1 Quantity (μg / gU) of undetermined elements and expected relative combined uncertainty (%)

[0130]

[0131]

[0132] 1 material dissolved

[0133] 1.1 Material selection

[0134] The uranium 8 oxide mineral material of a uranium mining enterprise was selected as the raw material, and its undetermined value content is shown in Table 1-2 below.

[0135] Table 1-2 Element content of undetermined values ​​of raw materials for preparation of UO3O8 candidates

[0136]

[0137]

[0138] It can be seen from the table that the content of undetermined value elements in the raw materials are all lower than the quantitative value, which meets the technological requirements.

[0139] 1.2 Dissolution

[0140] Considering the preparatio...

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Abstract

The invention relates to a preparation method of uranium and impurity element standard substances in triuranium octaoxide. The preparation method comprises the following steps: step one, sufficientlydissolving the raw material of triuranium octaoxide with MOS-level nitric acid; step two, preparing a constant-value element solution; step three, filtering a uranyl nitrate solution obtained in the step one; step four, converting the uranyl nitrate solution added with constant-value elements into a precipitation reaction tank; step five, filtering an ammonium diuranate sediment obtained in the step four; step six, carrying out drying, pyrolysis and calcinations on the ammonium diuranate sediment added with the constant-value elements in sequence to obtain the triuranium octaoxide product; andstep seven, carrying out grinding, electrostatic elimination, sieving and blending on the triuranium octaoxide product prepared and obtained in the step six by using a ball grinding mill. The preparation method solves the technical problems of quantitative addition and uniform distribution of trace constant-value elements in the triuranium octaoxide product, and is high in technological controllability.

Description

technical field [0001] The invention belongs to the field of standard substance preparation, and in particular relates to a method for preparing standard substances of uranium and impurity elements in triuranium octaoxide. Background technique [0002] Nuclear fuel elements are the "core" of nuclear power plant reactors, and uranium dioxide for the production of nuclear fuel elements is an important part of nuclear fuel elements. The content of impurity elements in uranium dioxide is directly related to the quality of nuclear fuel elements, and it is necessary to strictly control the impurity elements in uranium dioxide. content. UO3 is one of the most important uranium oxides, and it is also the most stable uranium oxide, because uranium dioxide, uranium hexafluoride and uranium tetrafluoride are not stable in the air, so U3O8 standard material is generally used. , used for the traceability of the production process of nuclear grade uranium dioxide (powder and pellets), ur...

Claims

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Application Information

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IPC IPC(8): G01N1/28G01N1/34G01N1/38G01N1/44
CPCG01N1/28G01N1/34G01N1/38G01N1/44G01N2001/2893
Inventor 龚明明曹淑琴孙雪云郭国龙王春叶丁红芳刘春华许红芬王海生杨丹丹李梁曹欣然
Owner BEIJING RESEARCH INSTITUTE OF CHEMICAL ENGINEERING AND METALLURGY
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