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Method for measuring content of radioactive elements thorium and uranium in coal gangue

A radioactive element and measurement method technology, applied in the field of thorium and uranium element determination, can solve the problems of inability to measure multiple elements, matrix interference, cumbersome operation, etc., achieve accurate and reliable test results, promote oxidation and decomposition, and reduce dosage

Pending Publication Date: 2020-08-07
HUNAN RARE EARTH METAL MATERIAL RES INST
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Problems solved by technology

These methods have disadvantages such as serious matrix interference, pre-separation and enrichment, low sensitivity, inability to determine multi-elements, and cumbersome operation.

Method used

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  • Method for measuring content of radioactive elements thorium and uranium in coal gangue
  • Method for measuring content of radioactive elements thorium and uranium in coal gangue
  • Method for measuring content of radioactive elements thorium and uranium in coal gangue

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Embodiment 1

[0046] A method for determining the content of radioactive elements thorium and uranium in coal gangue by microwave digestion-inductively coupled plasma mass spectrometry, comprising the following steps:

[0047] (1) Pass the gangue sample through a 0.090mm sieve in advance, and dry it at 105°C for 2 hours. After cooling, weigh 0.2g coal gangue sample into a microwave digestion tank, add a small amount of water to moisten it, add 5mL concentrated nitric acid (ρ=1.42g / mL), 3mL concentrated hydrofluoric acid (ρ=1.15g / mL), 1mL concentrated hydrogen peroxide (mass fraction 30%), digested according to a preset microwave digestion program;

[0048]The microwave digestion program is: using a power of 900W, the first temperature rise, from room temperature to 150°C within 10 minutes, and stay for 10 minutes; the second temperature rise, from 150°C to 210°C within 15 minutes, and stay for 20 minutes;

[0049] (2) Cool to room temperature after digestion, rinse the inner wall of the di...

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Abstract

The invention discloses a method for measuring the content of radioactive elements thorium and uranium in coal gangue. The method comprises the following steps: carrying out microwave digestion on coal gangue in a concentrated nitric acid-concentrated hydrofluoric acid-concentrated hydrogen peroxide system in a closed manner, adding concentrated perchloric acid after the digestion is completed, performing heating on an acid driving instrument to remove fluorine and silicon, heating a sample digestion solution until white smoke comes near, performing cooling, adding nitric acid to dissolve salts, and performing diluting with ultrapure water to obtain a test solution; preparing a series of standard solutions and internal standard solutions, and determining by using an inductively coupled plasma mass spectrometer. According to the invention, hydrogen peroxide is added during microwave digestion, the decomposition of fixed carbon in the sample is obviously promoted, and the dissolution effect of the to-be-detected element is improved. According to the method, the content of the natural radioactive elements thorium and uranium in the coal gangue sample can be rapidly determined, the detection limit of the method reaches 0.0028 mu g / g, the relative standard deviation ranges from 0.75% to 2.54%, and the adding standard recovery rate ranges from 98.00% to 103.60%.

Description

technical field [0001] The invention relates to a method for determining thorium and uranium elements, in particular to a microwave digestion-inductively coupled plasma mass spectrometry method for determining the content of radioactive elements thorium and uranium in coal gangue. Background technique [0002] Coal gangue is a rock associated and symbiotic with coal during the formation of coal. It is a solid waste generated during coal mining and washing and processing. It has a lower carbon content and is harder than coal. Generally, 0.15 to 0.2 tons of coal gangue will be produced for every ton of raw coal produced. A large amount of coal gangue is piled up in the open air, which has become a kind of industrial waste with the largest stockpile and annual output in my country and occupies the most storage space, which has brought very serious problems. social, environmental and economic issues. The chemical composition of coal gangue is diverse, containing a large amount o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/62G01N1/28G01N1/44G01N27/626
CPCG01N27/62G01N1/28G01N1/44
Inventor 王贵超刘荣丽王志坚樊玉川吴希桃罗勉罗芝雅石雪峰
Owner HUNAN RARE EARTH METAL MATERIAL RES INST
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