Method for Determination of Carbon and Sulfur Content in Ferroalloy by Different Standard Calibration Infrared Absorption Method

A technology of infrared absorption and infrared carbon and sulfur analysis, which is applied in measuring devices, material analysis through optical means, instruments, etc., can solve the problem that the iron alloy standard sample cannot meet the analysis standards, and achieve the effect of accurate analysis results

Active Publication Date: 2015-12-02
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. question of request

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Embodiment Construction

[0017] In the embodiment of the present invention, the principle of using an infrared carbon-sulfur analyzer to determine a ferroalloy sample is: the ferroalloy sample is heated by a high-frequency furnace in an oxygen stream, and carbon and sulfur respectively generate CO 2 And SO 2 , Part of CO is generated, and after filtering and dehumidifying with oxygen as carrier gas, it enters SO 2 Infrared absorption cell, determination of sulfur content; determination of SO 2 After the gas, through the catalytic furnace, the CO is converted into CO 2 , Then desulfurization, enter CO 2 The infrared cell measures the carbon content.

[0018] In the embodiment of the present invention, the reagents and instruments used are preferably:

[0019] Pure iron flux: C: <0.0005%, S: <0.0005%;

[0020] Pure tin flux: C: <0.0005%, S: <0.0005%;

[0021] Tungsten flux: C: <0.0005%, S: <0.0005%;

[0022] Vanadium pentoxide: analytically pure, C: <0.0005%, S: <0.0005%;

[0023] Crucible: special crucible for in...

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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 the content of carbon and sulfur 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 infrared absorption method to determine the analysis method of carbon and sulfur content in ferroalloys stipulate: Choose three standard samples of the same type, and the content of the sample to be tested should fall within the content range of the selected three standard samples. Use standard samples to calibrate the instrument's working curve, determine the linearity of the instrument's working curve, and then analyze the samples. Because the carbon and sulfur content of the sample fluctuates greatly, it is difficult to meet the conditions specified by the national standar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/3563G01N21/3577
Inventor 卢艳蓉
Owner INNER MONGOLIA BAOTOU STEEL UNION
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