Method for quickly determining calcium fluoride and calcium oxide contents in desulfurizer for steel making

A rapid determination and desulfurization agent technology, applied in the direction of material electrochemical variables, thermal excitation analysis, material excitation analysis, etc., can solve the problems of large fluctuations in CaF2 content, complex sample processing methods, poor accuracy and precision, etc. To achieve the effect of reducing the inspection cost, shortening the analysis cycle, and reducing the use

Active Publication Date: 2013-03-20
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, due to the large variety and complex sample processing methods, alkali fusion combined with X-fluorescence method is mostly used in the industry, but the accuracy and precision of this method are poor, and the measured CaF 2 The content fluctuates greatly
For calcium oxide, chemical methods are mostly used for analysis, the analysis time is long, the analysis steps are complicated, and the repeatability limit is generally about 3%.

Method used

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  • Method for quickly determining calcium fluoride and calcium oxide contents in desulfurizer for steel making
  • Method for quickly determining calcium fluoride and calcium oxide contents in desulfurizer for steel making
  • Method for quickly determining calcium fluoride and calcium oxide contents in desulfurizer for steel making

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 1) Determination of TCaO content in the sample

[0028] (a) Draw the working curve of the limestone chemical analysis standard sample according to the requirements of the ICP-AES instrument;

[0029] Select the standard sample in Table 1 and follow the melting steps to dissolve and constant volume for ICP-AES analysis (can you provide the working parameters).

[0030] Table 1 Preparation table of working curve test solution

[0031]

[0032] (b) Weigh 0.1000g of the first desulfurizer sample numbered 1# and place it in a platinum crucible, add 1.0g of boric acid and anhydrous sodium carbonate in a volume ratio of 1:2 mixed flux, mix it in Melt at 950°C for 5 minutes. After cooling, place the platinum crucible in a pre-boiled dilute hydrochloric acid solution with a volume of 85mL for heating and leaching. During the leaching process, add 5mL of concentrated hydrochloric acid solution to control the acidity and keep the solution volume at 80mL. After complete leachi...

Embodiment 2

[0049] 1) Determination of TCaO content in the sample

[0050] (a) Draw the working curve of the limestone chemical analysis standard sample according to the requirements of the ICP-AES instrument;

[0051] (b) Weigh 0.2000g of the second desulfurizer sample numbered 2# and place it in a platinum crucible, add 2.0g of boric acid and anhydrous sodium carbonate in a volume ratio of 1:4 to form a mixed flux, and mix it at temperature Melting at 940°C for 10 minutes, after cooling, place the platinum crucible in a pre-boiled dilute hydrochloric acid solution with a volume of 170mL for heating and leaching. During the leaching process, add 10mL of concentrated hydrochloric acid solution to control the acidity and keep the solution volume at 160mL. After complete leaching, take it out and cool it to room temperature, then set the volume to 200mL. The dilute hydrochloric acid solution is a mixture of concentrated hydrochloric acid and water in a volume ratio of 1:10;

[0052] (c) Ta...

Embodiment 3

[0064] 1) Determination of TCaO content in the sample

[0065] (a) Draw the working curve of the limestone chemical analysis standard sample according to the requirements of the ICP-AES instrument;

[0066] (b) Weigh 0.3000g of the third desulfurizer sample numbered 3# and place it in a platinum crucible, add 3.0g of boric acid and anhydrous sodium carbonate in a volume ratio of 1:1 to form a mixed flux, and mix it at temperature Melt at 960°C for 3 minutes. After cooling, place the platinum crucible in a pre-boiled dilute hydrochloric acid solution with a volume of 240mL for complete leaching. During the leaching process, add 30mL of concentrated hydrochloric acid solution to control the acidity and keep the solution volume at 230mL. , after being fully leached, take it out and cool it to room temperature and then set the volume to 300mL, wherein the dilute hydrochloric acid solution is a mixture of concentrated hydrochloric acid and water in a volume ratio of 1:10;

[0067]...

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Abstract

The invention discloses a method for quickly determining the calcium fluoride and calcium oxide contents in a desulfurizer for steel making. In the method, a working curve of a limestone chemical analysis standard sample is drawn, and a working curve of a desulfurizer is established on a fluoride ion electrode, thus determining the TCaO and CaF2 contents in the desulfurizer; and the calcium fluoride and calcium oxide contents are obtained quickly based on related values. According to the invention, a desulfurizer sample having a CaF2 content range of 0-40% can be detected, and the range almost covers the CaF2 distribution gradient of all desulfurizers in the production process, so that the method can be used for the quantitative CaF2 detection of laboratory desulfurizers for a long time. A plasma TCaO content analysis method greatly shortens the analysis cycle and simplifies the analysis steps; and for one lot sample, the analysis time based on the plasma TCaO content analysis method is about 40 minutes while the analysis time based on a chemical analysis method is 120 minutes. The method disclosed by the invention is simple to operate, high in accuracy and favorable in repetitiveness; and the sample detection time can be controlled to be within 5 minutes.

Description

technical field [0001] The invention relates to an analysis and test method, in particular to a rapid determination method for the content of calcium fluoride and calcium oxide in a desulfurizer for steelmaking. Background technique [0002] The development of modern industry and scientific and technological progress have higher and higher requirements on the quality and performance of steel, and sulfur is the main harmful element affecting the quality and performance of steel, affecting the processing performance and performance of steel. Desulfurizer is used as a flux in the iron and steel industry, which can lower the melting point of refractory substances, promote the flow of slag, and separate the slag and metal well. When used together with lime in the smelting process, it can reduce the content of sulfur and phosphorus in steel and strengthen Because of its forgeability and tensile strength, it is one of the important auxiliary raw materials in the steelmaking process...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/71G01N27/26
Inventor 崔隽吕琦郑菲李小杰沈克张小凡郭芳黄柏华古兵平吕红波
Owner 武汉钢铁有限公司
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