Measuring method of content of rare earth elements in thorium dioxide

A rare earth element, thorium dioxide technology, applied in the establishment of a new chemical detection field, to meet the requirements of project analysis technical indicators and simple operation

Inactive Publication Date: 2016-07-20
CHINA NUCLEAR BAOTOU GUANGHUA CHEM IND
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There are no public reports on the research results of the determination methods of rare earth elements in thorium dioxide at home and abroad

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0031] (1) Dissolution of the sample

[0032] Accurately weigh 0.2-0.8g sample into a polytetrafluoroethylene beaker, add 20-50mL concentrated nitric acid (re-distilled superior grade pure) and heat on a heating plate; add 0.05-1.0mL of 0.5% hydrofluoric acid solution after steaming , the solution was clear and evaporated to near dryness. Add 5 mL of 3 mol / L nitric acid solution, add 0.2-0.5 mL of hydrogen peroxide (20%, superior grade), steam until the solution is clear and then cool.

[0033] (2) Separation of thorium and rare earth elements

[0034] Wash the beaker three times and transfer to a 60mL quartz separatory funnel added with 20-40mL extractant (carbon tetrachloride: tributyl phosphate = 1:1), shake and stand for 3min-5min to separate and discard the organic phase. Transfer the water phase into a polytetrafluoroethylene beaker, add 1 mL of nitric acid (double-distilled superior grade) and heat it on a hot plate until nearly dry, repeat the extraction operation tw...

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Abstract

The invention relates to a novel chemical detection method, and more specifically relates to a method used for measuring the content of 15 rare earth elements in thorium dioxide powder and blocks via inductively coupled plasma-atomic emission spectrometry. The method comprises following steps: sample dissolving, wherein a 0.2-0.5% hydrofluoric acid solution is added in dissolving of thorium dioxide, and adding amount is controlled to be 0.1ml or less; separation of thorium and the rear earth elements, wherein 3mol/L nitric acid is taken as a medium, an extraction agent composed of carbon tetrachloride and tributyl phosphate at 1:1 is used for three times of extraction so as to separate thorium and the rear earth elements; and sample measuring. According to the method, analytical line of the measured elements, sample substrate concentration, sample dissolving method, thorium and the rear earth elements separation method and conditions, and instrument parameters are determined, and inter element measuring interference test is carried out at the same time; an inductive coupling plasma emission spectrometer is used for simultaneous determination of the contents of the elements; method precision is high than 10%; and average recovery rate ranges from 91 to 110%. Operation of the method is simple; and the method is accurate and reliable.

Description

technical field [0001] The invention relates to establishing a new chemical detection method, in particular to a method for measuring the content of 15 kinds of rare earth elements in thorium dioxide powder and pellets by using plasma emission spectrometry. Background technique [0002] Nuclear power generation currently uses uranium fuel as the main raw material, but mineral deposits with high uranium content are rapidly decreasing. One of the nuclear fuels that can replace uranium is thorium fuel. The content of impurity elements in thorium dioxide directly affects the performance of components during use as nuclear fuel, and even affects the safe operation of nuclear reactors. There is no public report on the research results of the determination method of rare earth elements in thorium dioxide at home and abroad. Contents of the invention [0003] The purpose of the present invention is to establish a detection method for measuring the content of 15 kinds of rare eart...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/73G01N1/28
Inventor 陈艳宏冯海宁
Owner CHINA NUCLEAR BAOTOU GUANGHUA CHEM IND
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