Method for determining contents of carbon and sulfur in iron alloy by using infrared absorption method with calibration of different reference materials

A technology of infrared absorption and infrared carbon and sulfur analysis, which is applied in measuring devices, color/spectral characteristic measurement, material analysis through optical means, etc., can solve the problem that the iron alloy standard sample cannot meet the requirements of the analysis standard, and achieve accurate analysis results Effect

Active Publication Date: 2013-07-10
INNER MONGOLIA BAOTOU STEEL UNION
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Problems solved by technology

[0004] The technical problem solved by the present invention is to provide a method for measuring the content of carbon and sulfur in iron alloy by infrared absorption method with different standard correction, so as to solve the problem that the analysis standard cannot be met when there are few iron alloy standard samples

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Embodiment Construction

[0022] In the embodiment of the present invention, the principle of using the infrared carbon and sulfur analyzer to measure the ferroalloy sample is as follows: the ferroalloy sample is heated by a high-frequency furnace in an oxygen flow, and carbon and sulfur respectively generate CO 2 and SO 2 , a part of CO is generated, and after dust filtration and dehumidification with oxygen as the carrier gas, it enters SO 2 Infrared absorption cell, determination of sulfur content; determination of SO 2 After the gas, through the catalytic furnace, convert CO into CO 2 , then desulfurized, into CO 2 Infrared cell to determine carbon content.

[0023] In the embodiments of the present invention, the reagents and instruments used are preferably:

[0024] Pure iron flux: C: <0.0005%, S: <0.0005%;

[0025] Pure tin flux: C: <0.0005%, S: <0.0005%;

[0026] Tungsten flux: C: <0.0005%, S: <0.0005%;

[0027] Vanadium pentoxide: analytically pure, C: <0.0005%, S: <0.0005%;

[0028] C...

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Abstract

The invention discloses a method for determining contents of carbon and sulfur in iron alloy by using infrared absorption method with calibration of different reference materials. The method comprises the following steps: selecting the iron alloy as a first reference material according to the type of an iron alloy test sample and the carbon and the sulfur contents, and calibrating a working curve of an infrared carbon and sulfur analyzer by using the first reference material; determining the contents of carbon and sulfur in flux as blank values, inputting the blank values into the infrared carbon and sulfur analyzer after calibration, and deducting the blank values from the infrared carbon and sulfur analyzer when the iron alloy test sample is determined so as to eliminate the affects of the flux on the measurement result of the iron alloy reference material; and introducing the iron alloy test sample and the flux after fusion into the infrared carbon and sulfur analyzer after the blank values are input for measurement so as to respectively obtain the contents of carbon and sulfur in the iron alloy test sample. According to the method, the problem of incapability of meeting the requirements of analysis standard when the iron alloy reference materials are few can be solved.

Description

technical field [0001] The invention relates to the technical field of iron and steel metallurgical analysis, in particular to a method for measuring carbon and sulfur contents in ferroalloys by a different standard correction infrared absorption method. Background technique [0002] At present, the national standards GB4700.5-88, GB5686.5-88, GB7730.5-88 and the enterprise standard QJH / BG-02-111-2000 are stipulated in the infrared absorption method for the determination of carbon and sulfur content in ferroalloys: Select three standard samples of the same type, and the content of the sample to be tested should fall within the content range of the three selected standard samples. Calibrate the working curve of the instrument with standard samples, determine the linearity of the working curve of the instrument, and then analyze the samples. Because the carbon and sulfur content of the sample fluctuate greatly, it is difficult to meet the conditions stipulated by the national...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/35G01N21/3577
Inventor 卢艳蓉
Owner INNER MONGOLIA BAOTOU STEEL UNION
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