A method for measuring sulfur content in slag melting flux

Abstract

The invention discloses a method for measuring the sulfur content of a slag melting flux. According to the method, a high frequency infrared carbon-sulfur analyzer is adopted, and a high frequency induced combustion-infrared ray absorption method is used to measure the sulfur content. The method comprises the following steps: preparing a spare for the test, measuring the blank value of sulfur content, calibrating a high frequency infrared carbon-sulfur analyzer, sampling, preparing a sample, preparing a specimen, and measuring the sulfur content of a sample of slag melting flux powder. The provided method solve the problem that there is no a standard sample of slag melting flux. The repeatability and accuracy of measurement results are good. The problem that sulfur content of slag melting flux is difficult to measure is solved. A reliable technical support is provided for controlling the quality of steel smelting.

Description

technical field

[0001] The invention belongs to the technical field of element quantitative analysis, and in particular relates to a method for measuring the sulfur element content in a slag melting flux. Background technique

[0002] In converter steelmaking, the speed of slagging and the effect of slagging directly affect the metallurgical effect of the smelting process. In order to improve the slag removal effect, the commonly used fluxes are iron oxide-containing materials such as fluorspar, iron ore, and sludge balls. Fluorite slag is conducive to rapid slagging, does not reduce the slag alkalinity, has the advantages of small impact on thermal balance, but has the disadvantages of accelerating lining erosion, easily causing splashing and polluting the environment; materials containing iron oxide have little environmental pollution, but the cost is high , Slow slag melting, great influence on heat balance. In order to better improve the stability of smelting process c...

Examples

Embodiment 1

[0030] 1. The spare parts used in the determination process are as follows: the first standard substance: converter slag GBW01707, the sulfur content is: 0.459%; the second standard substance: converter slag GBW01705, the sulfur content is: 0.126%; the third standard substance: high Slag BH0124-3, sulfur content: 0.76%; porcelain crucible: PT type ￠25mm×25mm; high-purity tungsten flux: C: <0.0008%, S: <0.0005%; pure iron flux: C: <0.0005 %, S: <0.0005%;

[0031] The instrument used in the determination process is CS-3000 (Beijing Nanke) high-frequency infrared carbon and sulfur analyzer. The working conditions of the instrument are: measuring flow rate 3.5L / min, oxygen pressure 0.30MPa, power gas pressure 0.38MPa, analysis time 50s. Environmental conditions: indoor relative humidity 45%.

[0032] 2. Determine the blank value of sulfur content: use a high-frequency infrared carbon-sulfur analyzer to measure the blank value of pure iron flux: S: 0.00005%, and the blank value o...

Embodiment 2

[0040] 1. The spare parts used in the determination process are as follows: the first standard substance: converter slag GBW01707, the sulfur content is: 0.459%; the second standard substance: converter slag GBW01705, the sulfur content is: 0.126%; the third standard substance: high Slag BH0124-3, sulfur content: 0.76%; porcelain crucible: PT type ￠25mm×25mm; high-purity tungsten flux: C: <0.0008%, S: <0.0005%; pure iron flux: C: <0.0005 %, S: <0.0005%;

[0041] The instrument used in the determination process is CS-3000 (Beijing Nanke) high-frequency infrared carbon and sulfur analyzer. The working conditions of the instrument are: measuring flow rate 3.0L / min, oxygen pressure 0.28MPa, power gas pressure 0.28MPa, analysis time 50s. Environmental conditions: indoor relative humidity 60%.

[0042] 2. Determine the blank value of sulfur content: use a high-frequency infrared carbon-sulfur analyzer to measure the blank value of pure iron flux: S: 0.00005%, and the blank value o...

Embodiment 3

[0050] 1. The spare parts used in the determination process are as follows: the first standard substance: converter slag GBW01707, the sulfur content is: 0.459%; the second standard substance: converter slag GBW01705, the sulfur content is: 0.126%; the third standard substance: high Slag BH0124-3, sulfur content: 0.76%; porcelain crucible: PT type ￠25mm×25mm; high-purity tungsten flux: C: <0.0008%, S: <0.0005%; pure iron flux: C: <0.0005 %, S: <0.0005%; the instrument used in the determination process is CS-3000 (Beijing Nanke) high-frequency infrared carbon and sulfur analyzer. The working conditions of the instrument are: measuring flow rate 2.5L / min, oxygen pressure 0.20MPa, power gas pressure 0.20MPa, analysis time 55s. Environmental conditions: indoor relative humidity 50%.

[0051] 2. Determine the blank value of sulfur content: use a high-frequency infrared carbon-sulfur analyzer to measure the blank value of pure iron flux: S: 0.00005%, and the blank value of sulfur c...

technical field

[0001] The invention belongs to the technical field of element quantitative analysis, and in particular relates to a method for measuring the sulfur element content in a slag melting flux. Background technique

[0002] In converter steelmaking, the speed of slagging and the effect of slagging directly affect the metallurgical effect of the smelting process. In order to improve the slag removal effect, the commonly used fluxes are iron oxide-containing materials such as fluorspar, iron ore, and sludge balls. Fluorite slag is conducive to rapid slagging, does not reduce the slag alkalinity, has the advantages of small impact on thermal balance, but has the disadvantages of accelerating lining erosion, easily causing splashing and polluting the environment; materials containing iron oxide have little environmental pollution, but the cost is high , Slow slag melting, great influence on heat balance. In order to better improve the stability of smelting process c...

Examples

Embodiment 1

[0030] 1. The spare parts used in the determination process are as follows: the first standard substance: converter slag GBW01707, the sulfur content is: 0.459%; the second standard substance: converter slag GBW01705, the sulfur content is: 0.126%; the third standard substance: high Slag BH0124-3, sulfur content: 0.76%; porcelain crucible: PT type ￠25mm×25mm; high-purity tungsten flux: C: <0.0008%, S: <0.0005%; pure iron flux: C: <0.0005 %, S: <0.0005%;

[0031] The instrument used in the determination process is CS-3000 (Beijing Nanke) high-frequency infrared carbon and sulfur analyzer. The working conditions of the instrument are: measuring flow rate 3.5L / min, oxygen pressure 0.30MPa, power gas pressure 0.38MPa, analysis time 50s. Environmental conditions: indoor relative humidity 45%.

[0032] 2. Determine the blank value of sulfur content: use a high-frequency infrared carbon-sulfur analyzer to measure the blank value of pure iron flux: S: 0.00005%, and the blank value o...

Embodiment 2

[0040] 1. The spare parts used in the determination process are as follows: the first standard substance: converter slag GBW01707, the sulfur content is: 0.459%; the second standard substance: converter slag GBW01705, the sulfur content is: 0.126%; the third standard substance: high Slag BH0124-3, sulfur content: 0.76%; porcelain crucible: PT type ￠25mm×25mm; high-purity tungsten flux: C: <0.0008%, S: <0.0005%; pure iron flux: C: <0.0005 %, S: <0.0005%;

[0041] The instrument used in the determination process is CS-3000 (Beijing Nanke) high-frequency infrared carbon and sulfur analyzer. The working conditions of the instrument are: measuring flow rate 3.0L / min, oxygen pressure 0.28MPa, power gas pressure 0.28MPa, analysis time 50s. Environmental conditions: indoor relative humidity 60%.

[0042] 2. Determine the blank value of sulfur content: use a high-frequency infrared carbon-sulfur analyzer to measure the blank value of pure iron flux: S: 0.00005%, and the blank value o...

Embodiment 3

[0050] 1. The spare parts used in the determination process are as follows: the first standard substance: converter slag GBW01707, the sulfur content is: 0.459%; the second standard substance: converter slag GBW01705, the sulfur content is: 0.126%; the third standard substance: high Slag BH0124-3, sulfur content: 0.76%; porcelain crucible: PT type ￠25mm×25mm; high-purity tungsten flux: C: <0.0008%, S: <0.0005%; pure iron flux: C: <0.0005 %, S: <0.0005%; the instrument used in the determination process is CS-3000 (Beijing Nanke) high-frequency infrared carbon and sulfur analyzer. The working conditions of the instrument are: measuring flow rate 2.5L / min, oxygen pressure 0.20MPa, power gas pressure 0.20MPa, analysis time 55s. Environmental conditions: indoor relative humidity 50%.

[0051] 2. Determine the blank value of sulfur content: use a high-frequency infrared carbon-sulfur analyzer to measure the blank value of pure iron flux: S: 0.00005%, and the blank value of sulfur c...