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Method for measuring sulphur content in witherite

A technology for sulfur content and witherite, applied in measuring devices, color/spectral characteristic measurement, sampling, etc., can solve the problems of difficult replacement of standard samples and no national standard samples for witherite, and achieve reliable technical support, easy operation, and solution Measuring the effect of puzzles

Inactive Publication Date: 2019-10-18
WUKUN STEEL
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AI Technical Summary

Problems solved by technology

Witherite is in a powder state, so how to choose a suitable fluxing material to ensure the complete release of sulfur is particularly important. How to determine the working conditions of the high-frequency infrared carbon-sulfur analyzer is still inconclusive; witherite has no national standard samples, how to find alternative standards so difficult

Method used

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Embodiment 1

[0030] 1. The spare parts used in the measurement process are as follows:

[0031] 1.1 Barium carbonate: benchmark pure;

[0032] 1.2 Standard substance Prepare standard substance with blast furnace slag and reference barium carbonate in a weight ratio of 7+3 as follows:

[0033] The first standard material: blast furnace slag YSBC28851-98, the sulfur content is 1.03%, and the sulfur content after preparation is 0.72%;

[0034] The second standard substance: blast furnace slag BH191-1, the sulfur content is 0.55%, and the sulfur content after preparation is 0.39%;

[0035] The third reference material: blast furnace slag BH191-2, the sulfur content is 1.56%, and the sulfur content after preparation is 1.09%;

[0036] 1.3 Porcelain crucible: PT type ￠25mm×25mm;

[0037] 1.4 High-purity tungsten particle flux: C: <0.0008%, S: <0.0005%;

[0038] 1.5 Ultra-low sulfur blank value pure iron flux: C: <0.0005%, S: <0.0005%;

[0039] The instrument used in the determination proces...

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Abstract

The invention discloses a method for measuring a sulphur content in witherite. The method is used for measuring the sulfur content by using a high-frequency infrared carbon and sulfur analyzer and a high-frequency induction combustion-infrared absorption method, and specifically comprises the following steps: preparing a reserve part for measurement, measuring a sulphur content blank value, calibrating the high-frequency infrared carbon and sulfur analyzer, sampling, and preparing a sample, preparing a test material, and measuring the sulphur content in a witherite powder sample to be tested.The working conditions of the instrument are as follows: the measurement flow rate is 3+ / -0.5 L / min, the oxygen pressure is 0.2-0.4 MPa, the power barometric pressure is 0.2-0.4 MPa, and the minimum analysis time is 60 s. The method has the advantages of having good reproducibility and accuracy of measurement result, solving the problem of measuring the sulfur content in the witherite, and providing a reliable technical guarantee for steel smelting quality control.

Description

technical field [0001] The invention belongs to the technical field of element quantitative analysis, and in particular relates to a method for determining the content of sulfur in witherite. Background technique [0002] In converter steelmaking, dephosphorization is one of the main tasks in the steelmaking process. Although phosphorus can increase the strength of steel, with the increase of phosphorus content, the plasticity and toughness of steel decrease, making steel "cold brittle". Activated lime is widely used as dephosphorization agent. With the continuous exploration of new technologies and new materials, some manufacturers have explored the use of witherite in active lime as a dephosphorization agent for steelmaking. The main component of witherite is barium carbonate, which decomposes into barium oxide at 1297°C. Barium oxide is an effective basic oxide to increase the alkalinity of the slag system, and high alkalinity is a favorable condition for dephosphorizati...

Claims

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Application Information

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IPC IPC(8): G01N21/3563G01N21/27
CPCG01N21/3563G01N21/274G01N2001/2893
Inventor 李文生王磊曾海梅许涯平
Owner WUKUN STEEL
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