A method for measuring sulfur content in dolomite

A technology for dolomite and sulfur content, applied in measuring devices, material analysis through optical means, instruments, etc., can solve the problems of difficult release, low test accuracy, and low sulfur measurement value, and achieve high measurement value and test accuracy High and precise results

Active Publication Date: 2016-09-28
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

For the phenomenon that the measurement result is on the low side, the inventor of the present invention has carried out a large amount of theoretical and practical analysis. The sulfur in the sample generates sulfur dioxide gas, and the calcium-magnesium carbonate double salt in the sample decomposes into carbon dioxide, calcium oxide, and magnesium oxide, and the two oxides of calcium oxide and magnesium oxide are highly alkaline and easily react with acidic Sulfur dioxide gas reacts, causing sulfur dioxide gas to be difficult to release from the melt, resulting in low sulfur measurement values ​​and low test accuracy; the inventor of the present invention believes that in order to overcome the aforementioned problems, the high-frequency infrared Absorption analysis technology can be used for the determination of sulfur content in dolomite. The key issue is to be able to select a suitable flux so that the sulfur in the sample can be fully oxidized into sulfur dioxide gas and released as completely as possible for infrared absorber detection. , to minimize the measurement error

Method used

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  • A method for measuring sulfur content in dolomite
  • A method for measuring sulfur content in dolomite
  • A method for measuring sulfur content in dolomite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Weigh the dolomite sample (sample A) to be tested with an electronic balance, and place it in a carbon-sulfur ceramic crucible, add different masses of molybdenum trioxide powder (melting point: 795°C), and use a fine wire to Mix the dolomite sample with molybdenum trioxide evenly, and then add metal tungsten particles fixedly, the mass ratio of metal tungsten particles to dolomite sample is 10:1. Cover the ceramic crucible; then place the carbon-sulfur ceramic crucible on a high-frequency infrared carbon-sulfur meter (Germany ELTRA company, model: CS2000) to measure the sulfur content, operate according to the instrument manual, and measure A dolomite sample twice in parallel , the measurement results are shown in Table 1.

[0027] Table 1

[0028]

[0029] It can be seen from Table 1 that when the mass ratio of molybdenum trioxide to sample is 3-4:1, the determination results are stable.

Embodiment 2

[0031] Weigh the dolomite sample to be tested (sample A) with an electronic balance, accurate to 0.1 mg, place it in a carbon-sulfur ceramic crucible, add molybdenum trioxide powder (melting point: 795°C), and control the mass ratio of molybdenum trioxide powder to sample at 3:1. Mix the dolomite sample to be tested with molybdenum trioxide evenly with a thin wire, then add metal tungsten particles of different qualities, and cover the ceramic crucible; then place the carbon-sulfur ceramic crucible in a high-frequency infrared carbon-sulfur analyzer (Germany ELTRA , model: CS2000) for the determination of sulfur content, according to the instrument manual, parallel measurement of A dolomite sample twice, the results are shown in Table 2.

[0032] Table 2

[0033]

[0034] It can be seen from Table 2 that when the mass ratio of metal tungsten particles to samples is 6-12:1, the results are stable.

Embodiment 3

[0036]Weigh the dolomite sample to be tested with an electronic balance, accurate to 0.1mg, place it in a carbon-sulfur ceramic crucible, add molybdenum trioxide powder (melting point: 795°C), and control the mass ratio of molybdenum trioxide to dolomite sample at 3:1 . Mix the dolomite sample to be tested with molybdenum trioxide evenly with a thin wire, and then add metal tungsten particles, the mass ratio of metal tungsten particles to dolomite sample is 10:1. Cover the ceramic crucible; then place the carbon-sulfur ceramic crucible on a high-frequency infrared carbon-sulfur analyzer (ELTRA, Germany, model: CS2000) to measure the sulfur content, and operate according to the instrument manual. First measure the sulfur content of YSB14749-96 dolomite chemical analysis standard sample, measure 3 times, calibrate the correction coefficient of sulfur in the high-frequency infrared carbon-sulfur meter instrument with the measured value obtained 3 times, and then measure the dolom...

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Abstract

The invention provides a method for measuring the sulfur content in dolomite. The method adopts the high-frequency induction furnace combustion infrared absorption method to measure the sulfur content in the dolomite. The fluxes used are metal tungsten and acidic metal oxides. The method of the invention has high testing precision and good stability.

Description

technical field [0001] The invention relates to a method for determining the sulfur content in dolomite. Background technique [0002] Dolomite is a carbonate mineral of calcium and magnesium, which is mainly used in the fields of refractory materials, ceramics, glass, building materials, environmental protection and chemical industry. In the iron and steel metallurgy industry, dolomite is mainly used as a basic refractory material and a flux for blast furnace ironmaking. In the field of environmental protection, dolomite is used as a raw material for flue gas desulfurization agent with good performance. [0003] Sulfur content in dolomite is an important indicator for assessing product quality. The existing technology mainly implements GB / T3286.7-1998 "Determination of Sulfur Content in Limestone and Dolomite Chemical Analysis Methods", JC / T1021.3-2007 "Non-metallic Minerals And Petrochemical Analysis Methods, Part 3, Carbonate Rocks, Mineral Chemical Analysis Methods "St...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/3563
Inventor 钟华
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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