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Thorium dioxide powder and method for determining nitrogen content in core block

A kind of technology of thorium dioxide and determination method, applied in the field of chemical detection

Inactive Publication Date: 2016-07-27
CHINA NUCLEAR BAOTOU GUANGHUA CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is no relevant report on the measurement of nitrogen content in thorium dioxide pellets

Method used

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  • Thorium dioxide powder and method for determining nitrogen content in core block
  • Thorium dioxide powder and method for determining nitrogen content in core block

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A method for determining nitrogen content in thorium dioxide powder and pellets, comprising the steps of:

[0036] The first step: sample preparation;

[0037] The thorium dioxide pellet sample was ground, sieved to make the particle size of the sample smaller than 150 μm, and the sample was stored in a dry polyethylene bottle.

[0038] The second step: sample dissolution;

[0039] Weigh 0.1 g of the powder sample obtained from the first step of grinding, accurate to 0.0001 g. Put it in a 100mL beaker, add 5mL hydrochloric acid, 1mL hydrogen peroxide, the hydrochloric acid here is superior grade, the density is 1.15g / cm 3 , where the hydrogen peroxide is superior grade pure, and the mass percent is 30%. Heat it to 350°C, and when the sample starts to react, add 0.05mL of 3 After the reaction is still, add 0.15mL of 30% pure hydrogen peroxide, and dissolve until the solution becomes clear. Continue heating to completely decompose hydrogen peroxide. Remove and let c...

Embodiment 2

[0049] A method for determining nitrogen content in thorium dioxide powder and pellets, comprising the steps of:

[0050] The first step: sample preparation;

[0051] The thorium dioxide pellet sample was ground, sieved to make the particle size of the sample smaller than 150 μm, and the sample was stored in a dry polyethylene bottle.

[0052] The second step: sample dissolution;

[0053] Weigh 0.5 g of the powder sample obtained from the first step of grinding, accurate to 0.0001 g. Put it in a 100mL beaker, add 5.5mL hydrochloric acid, 1mL hydrogen peroxide, the hydrochloric acid here is superior grade, the density is 1.15g / cm 3 , where the hydrogen peroxide is superior grade pure, and the mass percent is 30%. Heat it to 400°C, and when the sample starts to react, add 0.075mL of 3 0.35 mL of high-grade pure hydrofluoric acid with a mass percentage of 30% was added after the reaction was still, and dissolved until the solution became clear. Continue heating to completely...

Embodiment 3

[0060] A method for determining nitrogen content in thorium dioxide powder and pellets, comprising the steps of:

[0061] The first step: sample preparation;

[0062] The thorium dioxide pellet sample was ground, sieved to make the particle size of the sample smaller than 150 μm, and the sample was stored in a dry polyethylene bottle.

[0063] The second step: sample dissolution;

[0064] Weigh 1.0 g of the powder sample obtained from the first step of grinding, accurate to 0.0001 g. Put in a 100mL beaker, add 6mL hydrochloric acid, 1mL hydrogen peroxide, the hydrochloric acid here is superior grade, density is 1.15g / cm 3 , where the hydrogen peroxide is superior grade pure, and the mass percent is 30%. Heat it to 450°C, and when the sample starts to react, add 0.1mL of 3 After the reaction is still, add 0.5mL of 30% pure hydrogen peroxide, and dissolve until the solution becomes clear. Continue heating to completely decompose hydrogen peroxide. Remove and let cool.

[...

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Abstract

The invention belongs to the field of chemical detection technology, and concretely relates to thorium dioxide powder and a method for determining nitrogen content in a core block; and the invention aims at providing the thorium dioxide powder and the method for determining nitrogen content in the core block. The method comprises the following steps: preparation of a sample, dissolving of the sample, distillation and separation of nitrogen, and determination. The trace amount of nitrogen in thorium dioxide is determined by using a Nessler's reagent-spectrophotometry method; dissolving conditions, distillation time, distillation volume, addition of a color developing agent, and developing time of the powder shaped sample are provided; when the sample amount is 0.1-1.0g, the method precision is better than 5%, and the recovery rate is 96-105%.

Description

technical field [0001] The invention belongs to the technical field of chemical detection, and in particular relates to a method for measuring nitrogen content in thorium dioxide powder and pellets. Background technique [0002] Thorium is a fissile material obtained by multiplication. Thorium dioxide is the only stable oxide in thorium, which can form a solid solution with uranium dioxide or plutonium dioxide in any proportion, and can be used as nuclear fuel for light water reactors, heavy water reactors and liquid metal-cooled fast breeder reactors. There is no related report on the measurement of nitrogen content in thorium dioxide pellets. Contents of the invention [0003] The object of the present invention is to provide a method for measuring nitrogen content in thorium dioxide powder and pellets. [0004] The present invention is achieved like this: [0005] A method for determining nitrogen content in thorium dioxide powder and pellets, comprising the steps of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/78G01N21/31G01N1/28
Inventor 杨永明刘丽莎
Owner CHINA NUCLEAR BAOTOU GUANGHUA CHEM IND
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