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Method for testing chromium sesquioxide in flow guiding sand by means of wavelength dispersion X-ray fluorescent spectrometry

A technology of chromium trioxide and fluorescence spectroscopy, which is applied in the field of analysis and testing of chromium trioxide content in drainage sand, can solve the problems of complex and tedious chemical titration, time-consuming and other problems, and achieve the improvement of automatic casting rate of steelmaking, Simple and fast operation, to ensure the effect of safe production

Active Publication Date: 2015-04-22
武汉钢铁有限公司
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AI Technical Summary

Problems solved by technology

[0004] The invention provides a method for measuring chromium trioxide in drainage sand by wavelength dispersive X-ray fluorescence spectrometry, which solves the technical problems of complicated and time-consuming chemical titration in the prior art

Method used

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  • Method for testing chromium sesquioxide in flow guiding sand by means of wavelength dispersion X-ray fluorescent spectrometry
  • Method for testing chromium sesquioxide in flow guiding sand by means of wavelength dispersion X-ray fluorescent spectrometry
  • Method for testing chromium sesquioxide in flow guiding sand by means of wavelength dispersion X-ray fluorescent spectrometry

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Experimental program
Comparison scheme
Effect test

preparation example Construction

[0025] 2.1 Preparation of analytical samples

[0026] The cohesion of the drainage sand sample itself is very small, and it cannot be made into a well-formed sheet sample for X-ray fluorescence spectroscopic analysis when it is directly used for pressing, so we carried out the test of the adhesive. Commonly used solid binders include boric acid, methylcellulose, polyethylene, paraffin, starch, etc., and liquid binders include ethanol, but the commonly used reagents in steel analysis laboratories include boric acid, starch, and ethanol. Therefore, from the laboratory From the perspective of easy operation, we chose boric acid, starch and ethanol for the bonding test. From the test results can be seen from Table 3. Due to the poor cohesion of the drainage sand itself, the samples made of boric acid and ethanol cannot be molded for too long, and the samples are easily broken and decomposed, which may be difficult for the X-ray fluorescence instrument during the vacuuming process...

Embodiment 1

[0038] Example 1 Wavelength Dispersive X-ray Fluorescence Spectrometry Determination of Chromium Trioxide in Drainage Sand

[0039] Select a series of drainage sand production samples, and analyze according to the following method: Weigh 4.00 grams of the sample, mix 1.00 grams of starch, take the mixed sample and press it into a disc under the cake press machine, and the disc is covered with a plastic ring. Then the components were analyzed on ARL9800 fluorescence instrument.

[0040] 1. Precision test

[0041] We selected 2 samples with different contents to conduct 5 precision tests respectively, and the specific test results are shown in Table 6. It can be seen from Table 6 that the RSD of the sample is less than 0.25%, the precision is good, and it can fully meet the production requirements.

[0042] Table 6 Sample precision test (%)

[0043] Analysis times

1#

2#

1

37.82

13.38

2

37.92

13.41

3

37.66

13.41

...

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Abstract

The invention discloses a method for testing chromium sesquioxide in flow guiding sand by means of wavelength dispersion X-ray fluorescent spectrometry. The method comprises the steps: weighing flow guiding sand samples; uniformly mixing the flow guiding sand samples according to the mass rate of (2-4):1; tabletting; and testing spectral intensity of Cr in the flow guiding sand samples by virtue of a wavelength dispersion X-ray fluorescent spectrograph thereby obtaining the content of chromium sesquioxide in the flow guiding sand according to a standard work curve. The method is high in repeatability and reproducibility, high in accuracy and correctness, convenient and quick, saving in costs of manpower and material resources.

Description

technical field [0001] The invention relates to an analysis and test method for the content of chromium trioxide in drainage sand, in particular to a wavelength dispersive X-ray fluorescence spectrometry used for the determination of chromium trioxide in drainage sand. Background technique [0002] Chromium drainage sand refers to the ladle diversion material made of chromite as the main material and adding an appropriate amount of performance modifier. Drainage sand is used as the filling material for the nozzle at the bottom of the ladle. On the one hand, it is required to be sintered at a lower temperature to avoid accidents caused by the drainage sand floating up when adding molten steel. thick, otherwise it will affect the automatic pouring rate, thereby affecting the normal smelting operation. With the advancement of continuous casting technology, the ladle adopts sliding nozzle pouring steel instead of the original stopper rod - nozzle system, which obviously reduces...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N23/223
Inventor 吕琦崔隽郭芳沈克李小杰贾丽晖朱慧古兵平
Owner 武汉钢铁有限公司
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