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Method for testing content of elemental carbon and application thereof

A test method and technology of elemental carbon, applied in the direction of removing a certain component and weighing, etc., can solve the problem of inability to obtain carbon content accurately, and achieve the effect of high applicability and compatibility, fast and accurate determination of carbon content

Pending Publication Date: 2021-07-23
CHNA ENERGY INVESTMENT CORP LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the problem that the carbon content cannot be obtained accurately in the carbon content test existing in the prior art, and to provide a test method and application of the elemental carbon content. The test method can effectively eliminate water and low-temperature inorganic salts. Decomposition weight loss and weight gain due to reduction and oxidation of iron oxides to accurately determine carbon content

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0072] The carbon content in the sample is tested by thermogravimetric analyzer:

[0073] (1) Take 20±5mg of the sample to be tested respectively, denoted as m, firstly purge with nitrogen gas at 20-75mL / min, raise the temperature from room temperature at 20°C / min to 750°C, and keep it for 30min;

[0074] (2) Cool down to 100°C at 20°C / min, record the mass at this time as m1;

[0075] (3) Switch to air again at 20-75mL / min, keep warm for 20min, then raise the temperature to 950℃ at 20℃ / min, keep warm for 30min, cool down to room temperature, record the mass at this time as m2.

[0076] Carbon content C%=(m1-m2) / m×100%, the test results are shown in Table 2.

Embodiment 2

[0078] The carbon content of the fly ash sample was tested using a tube furnace, and the specific operation steps were as follows:

[0079] (1) The sample to be tested is calcined several times in a crucible to constant weight

[0080] (2) Weigh 1±0.001g sample, record it as m, put it into a crucible of known weight, firstly in a nitrogen atmosphere, raise the temperature from room temperature to 750°C at a heating rate of 10°C / min, keep it warm for 30min, and repeatedly burn to Constant weight, drop to room temperature at a cooling rate of 10°C / min, record the mass at this time as m1;

[0081] (3) Switch nitrogen to air, heat the sample (2) from room temperature to 950±25 °C at a rate of 10 °C / min in an oxidizing atmosphere, keep it warm for 30 min, repeatedly burn to constant weight, and cool down to room temperature , record the mass at this time as m2.

[0082] Carbon content C%=(m1-m2) / m×100%, the test results are shown in Table 2.

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PUM

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Abstract

The invention relates to the field of elemental analysis, and particularly discloses a method for testing the content of elemental carbon. The method comprises the following steps: in an inert atmosphere, carrying out a first heating procedure and first heat preservation treatment on a to-be-detected sample with the weight of m; carrying out first cooling treatment on the treated sample to reduce the temperature to a second temperature, wherein the weight of the sample is m1; at a second temperature, switching the atmosphere, carrying out second heat preservation treatment, carrying out a second heating procedure and third heat preservation treatment, and cooling to room temperature, the weight of the sample being m2, wherein the carbon content C% of the sample to be detected is equal to (m1-m2) / m * 100%. The method can effectively eliminate the influence of weight gain caused by decomposition weight loss of water and low-temperature inorganic salt and reduction oxidation of ferric oxide, so that the carbon content in the to-be-measured sample is accurately measured.

Description

technical field [0001] The invention relates to the field of elemental analysis, in particular to a method for testing elemental carbon content and its application. Background technique [0002] The carbon content refers to the percentage of the weight loss mass of the oxide dry basis (that is, after deducting the effects of water, inorganic salt decomposition, etc.) to the total mass after full oxidation. [0003] At present, the carbon content is usually measured by the loss on ignition method (ignition method), which cannot exclude the influence of water volatilization and decomposition of low-temperature inorganic salts, resulting in an overestimation of the measured carbon content. At the same time, the isothermal dual-atmosphere method proposed in the current literature cannot exclude the reduction reaction of iron oxide with carbon to iron under inert gas, and iron is oxidized to iron oxide under oxidizing gas, thus causing Weight gain in the oxidation section, probl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N5/04
CPCG01N5/04
Inventor 段雪蕾卓锦德李永龙马琳鸽董阳刘聪云
Owner CHNA ENERGY INVESTMENT CORP LTD