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Method for measuring sulfur content in iron ore

A determination method and technology for sulfur content, applied in material excitation analysis, thermal excitation analysis, etc., can solve the problems of cumbersome methods and many steps, and achieve the effect of ensuring sensitivity and accuracy, less reagents, and eliminating the limitation of detection range.

Inactive Publication Date: 2010-08-04
WUHAN IRON & STEEL (GROUP) CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But this measuring method is to measure with inductively coupled plasma optical emission spectrometer (ICP-OES) and atomic absorption spectrometer (AAS), and there are many steps, and method is comparatively loaded down with trivial details, and detection range is also 0.0005-5%

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  • Method for measuring sulfur content in iron ore
  • Method for measuring sulfur content in iron ore
  • Method for measuring sulfur content in iron ore

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) Weigh 0.1g (sampling volume accurate to less than 0.0002g) of iron ore to be tested with a particle size of less than 0.100mm, dried and cooled to room temperature with a sulfur content greater than 0.5%, and conduct a blank test along with the sample. Then put the sample in a polytetrafluoroethylene high-pressure digestion tank dedicated to microwave ovens, add 6mL of aqua regia, and start the program on the microwave oven for microwave digestion to ensure that the sample is completely decomposed. After the microwave digestion is completed, cool to room temperature, and then set the volume in a 50mL volumetric flask.

[0022] (2) Prepare sulfur standard solutions with a concentration of 25 μg / mL, 50 μg / mL, 100 μg / mL, 200 μg / mL, and 500 μg / mL with high-grade pure potassium sulfate, then weigh five parts of 0.06 g of high-purity iron, and use 6 mL of aqua regia After heating and dissolving on the electric heating plate, transfer it into a 50mL volumetric flask, and a...

Embodiment 2

[0027] (1) Weigh 1.0g (sampling amount is accurate to an error of less than 0.0002g) of an iron ore sample to be tested with a particle size of less than 0.100mm, dried and cooled to room temperature with a sulfur content greater than 0.0005%, and conduct a blank test along with the sample. Then put the sample in a PTFE high-pressure digestion tank dedicated to microwave ovens, add 12mL of aqua regia, and then add 3mL of hydrofluoric acid to speed up the dissolution of the sample, and then start the program on the microwave oven for microwave digestion to ensure that the sample is decomposed completely. After the microwave digestion is completed, cool to room temperature, and then set the volume in a 50mL volumetric flask.

[0028] (2) Three or more iron ore standard substances or standard samples whose sulfur content includes the sulfur content of the sample are dissolved with the same sample dissolution method as in step (1), and then used inductively coupled plasma emission...

Embodiment 3

[0032] (1) Weigh 0.5g (sampling amount is accurate to an error of less than 0.0002g) iron ore sample to be tested with a particle size of less than 0.100mm, dried and cooled to room temperature with a sulfur content greater than 0.0005%, and conduct a blank test together with the sample. Then put the sample in a PTFE high-pressure digestion tank dedicated to microwave ovens, add 6mL of aqua regia, and then add 2mL of hydrofluoric acid to speed up the dissolution of the sample, and then start the program on the microwave oven for microwave digestion to ensure that the sample is decomposed completely. After the microwave digestion is completed, cool to room temperature, and then set the volume in a 50mL volumetric flask.

[0033](2) Prepare sulfur standard solutions with a concentration of 25 μg / mL, 50 μg / mL, 100 μg / mL, 200 μg / mL, and 500 μg / mL with high-grade pure potassium sulfate, then weigh five parts of 0.20 g of high-purity iron, and use 6 mL of aqua regia After heating a...

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Abstract

The invention discloses a method for measuring sulfur content in iron ore. The method comprises the following steps: dissolving a sample in aqua regia by heating or using microwave to obtain the solution to be measured; measuring the spectral intensity of three or more types of ferrum-based solution of which the known sulfur content ranges comprise the sulfur content of the sample by using ICP-OES; establishing a calibration curve; measuring the spectral intensity of the solution to be measured; and performing regression calculation according to the calibration curve to obtain the sulfur content in the solution to be measured. Because the ICP-OES has the characteristics of wide linear detection range, high sensitivity, and accuracy, by using the method, the sulfur content over 0.0005 percent in the iron ore can be measured. Simultaneously, when the calibration curve is established, a matrix effect of an iron matrix can be eliminated by performing matrix matching, so that the measurement result is more accurate and reliable. In addition, in the method, the sample is dissolved by heating or using microwave, so that the method is more scientific and accurate. Moreover, the method can be realized only by simply dissolving the sample, measuring, establishing the calibration curve, and performing the regression calculation by using a computer, so the method has very high practicability.

Description

technical field [0001] The invention relates to a determination method of analytical chemistry, in particular to a determination method of sulfur content in iron ore. Background technique [0002] Sulfur in iron ore is one of the harmful elements that affect the iron and steel smelting process and product quality, and it is also one of the main indicators for evaluating the quality of iron ore. During smelting, part of the sulfur is reduced into pig iron, and sulfur-containing steel is prone to "hot embrittlement" during thermal processing. Although it can desulfurize during blast furnace smelting, it needs to consume more coke to increase the furnace temperature and limestone to increase the slag alkalinity, which greatly increases the production cost. Therefore, the iron ore used for smelting is generally required to contain less than 0.15% sulfur. It can be seen that the determination of sulfur content in iron ore is very important for iron and steel smelting. [0003]...

Claims

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Application Information

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IPC IPC(8): G01N21/73
Inventor 闻向东张穗忠赵希文李江文张前香文斌潘菁夏念平
Owner WUHAN IRON & STEEL (GROUP) CORP
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