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Method for determining carbon content in slag fluxing agent

A technology of carbon content and flux, which is applied in the field of measuring the carbon content in slag flux, can solve the problems of no national standard samples for slag flux and the inconclusive working conditions of high-frequency infrared carbon and sulfur analyzers, etc. Determination of difficult problems, reliable technical support, and the effect of improving accuracy

Active Publication Date: 2017-05-24
WUKUN STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The slag melting flux is in a powder state, so how to choose a suitable fluxing material to ensure the complete release of carbon is particularly important. How to determine the working conditions of the high-frequency infrared carbon and sulfur analyzer for carbon content analysis and measurement is still inconclusive; the slag melting flux There is no national standard sample, how to find an alternative standard sample is a difficult point

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The instrument used in the determination process is the CS-3000 (Beijing Nanke) high-frequency infrared carbon and sulfur analyzer. The selected working conditions are the measurement flow rate of 3.5 liters / min, the oxygen pressure of 0.4 MPa, and the power gas pressure of 0.4 MPa. The analysis time is 50s; the indoor relative humidity is not more than 60%.

[0035] 1) Preparation of spare parts for measurement: including the first standard substance: pig iron machine character 91-029, with a carbon content of 2.39%; the second standard material: pig iron machine character 91-012B, with a carbon content of 1.75%; the third standard substance : pig iron machine word 96-001, carbon content: 3.63%; blast furnace slag standard sample: TFe 0.21%, Al 2 o 3 9.05%, SiO 2 38.67%, MgO 4.07%, CaO 44.59%, the standard sample of blast furnace slag is burned in a muffle furnace at 1050°C for 2h before use, and then put into a desiccator for later use; Porcelain crucible: PT type ...

Embodiment 2

[0043] The instrument used in the determination process is the CS-3000 (Beijing Nanke) high-frequency infrared carbon and sulfur analyzer. The selected working conditions are the measurement flow rate of 2.5 liters / min, the oxygen pressure of 0.2 MPa, and the power gas pressure of 0.2 MPa. The analysis time is 50s; the indoor relative humidity is not more than 60%.

[0044] 1) Preparation of spare parts for measurement: including the first standard substance: pig iron machine character 91-029, with a carbon content of 2.39%; the second standard material: pig iron machine character 91-012B, with a carbon content of 1.75%; the third standard substance : pig iron machine word 96-001, carbon content: 3.63%; blast furnace slag standard sample: TFe 0.21%, Al 2 o 3 9.05%, SiO 2 38.67%, MgO 4.07%, CaO 44.59%, the standard sample of blast furnace slag is burned in a muffle furnace at 1000°C for 1h before use, and then put into a desiccator for later use; Porcelain crucible: PT type ...

Embodiment 3

[0052] The instrument used in the determination process is the CS-3000 (Beijing Nanke) high-frequency infrared carbon and sulfur analyzer. The selected working conditions are the measurement flow rate of 3 liters / min, the oxygen pressure of 0.3 MPa, and the power gas pressure of 0.3 MPa. The analysis time is 50s; the indoor relative humidity is not more than 60%.

[0053] 1) Preparation of spare parts for measurement: including the first standard substance: pig iron machine character 91-029, with a carbon content of 2.39%; the second standard material: pig iron machine character 91-012B, with a carbon content of 1.75%; the third standard substance : pig iron machine word 96-001, carbon content: 3.63%; blast furnace slag standard sample: TFe 0.21%, Al 2 o 3 9.05%, SiO 2 38.67%, MgO 4.07%, CaO 44.59%, the standard sample of blast furnace slag is burned in a muffle furnace at 1000~1100°C for 1~3h before use, and put into a desiccator after cooling for use; Porcelain crucible: ...

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Abstract

The invention discloses a method for determining the carbon content in slag fluxing agent. According to the method, the carbon content is determined by a high-frequency infrared carbon-sulfur analyzer through a high-frequency induction combustion-infrared absorption method. The method comprises the following steps: preparing spares for determination; determining a carbon content blank value; calibrating the high-frequency infrared carbon-sulfur analyzer; sampling and preparing a sample; preparing a specimen; and measuring the carbon content in the slag fluxing agent powdered sample to be measured. According to the invention, the optimal fluxing agent is selected through fluxing agent experiment, so that carbon in the slag fluxing agent can be completely released, thereby improving the measuring accuracy. The method disclosed by the invention can be operated simply and quickly; the determination result is favorable in reproducibility and accuracy; the problem of determining the carbon content in the slag fluxing agent is solved; and a reliable technical guarantee is provided for quality control on iron and 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 carbon 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 are less harmful to the environment, but the cost is high. Slagging is slow and has a great influence on heat balance. In order to better improve the stability of smelting process co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/3563
CPCG01N21/3563
Inventor 李文生阚绍宽王磊许涯平欧阳光
Owner WUKUN STEEL
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