Silicomolybdate blue photometric method for determination of silicon in high carbon ferromanganese

A high-carbon ferromanganese and blue light technology, which is used in the measurement of color/spectral properties and analysis by chemical reaction of materials, etc., to shorten the operation process, reduce labor costs, and stabilize the measurement results.

Inactive Publication Date: 2016-03-02
INNER MONGOLIA BAOTOU STEEL UNION
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Problems solved by technology

[0004] The purpose of the present invention is to solve the existing method to measure silicon in high-carbon ferromanganese when adding many types of medicines, large dosage, long flow process and slow operation, and Solve the problem that the data of high-carbon samples often appear low in the determination of the existing silicon-molybdenum blue photometric method, and at the same time speed up the operation speed and reduce costs, and provide a faster, more accurate and efficient silicon-molybdenum blue photometric method for the determination of high-carbon manganese method of silicon in iron

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  • Silicomolybdate blue photometric method for determination of silicon in high carbon ferromanganese

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[0011] 1. Method summary:

[0012] Weigh the high-carbon ferromanganese sample, dissolve the sample with nitric acid, heat and dissolve, oxidize with potassium permanganate until manganese dioxide precipitates, and then add dropwise sodium nitrite solution to reduce it. For samples that still have insoluble matter, it is necessary to carry out residue treatment and redox again. Silicic acid and ammonium molybdate generate silicon-molybdenum heteropolyacid, which is reduced with ferrous ammonium sulfate to generate silicon-molybdenum blue, and the absorbance is measured.

[0013] 2. Reagents:

[0014] 2.1 Nitric acid (the volume ratio of nitric acid with a density of 1.42g / mL to water is 1:3.5);

[0015] 2.2 Potassium permanganate solution (40g / L);

[0016] 2.3 Sodium nitrite solution (100g / L);

[0017] 2.4 Ammonium molybdate solution (17g / L);

[0018] 2.5 oxalic acid solution (50g / L);

[0019] 2.6 Ferrous ammonium sulfate solution: (60g / L);

[0020] 2.7 Mixed solvent (t...

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Abstract

The invention relates to a silicomolybdate blue photometric method for determination of silicon in high carbon ferromanganese. The method is characterized by comprising the steps of: dissolving a sample with nitric acid by heating, oxidizing by potassium permanganate to generate a manganese dioxide precipitate, and then dropwise adding a sodium nitrite solution for reduction and filtering; for an insoluble sample, carrying out residue treatment by burning and ashing the precipitate and filter paper in a platinum crucible, taking out and cooling after complete ashing, adding a mixed solvent prepared from solid sodium carbonate and solid boric acid in the ratio of 2:1, melting and decomposing at 900 DEG C, extracting a melt, conducting oxidation-reduction again in the original dissolved sample to produce silicon-molybdenum heteropolyacid by silicic acid and ammonium molybdate; and determining the absorbance by using the silicomolybdate blue generated from reduction of ammonium ferrous sulfate. The method has the advantages of rapidness, high efficiency, stable determination result and accurate and reliable data.

Description

technical field [0001] The invention belongs to the technical field of ferroalloy analysis, and relates to a quantitative analysis technique for measuring silicon in high-carbon ferromanganese by silicon-molybdenum blue photometry. Background technique [0002] Ferromanganese is an iron alloy composed of manganese and iron. There are mainly high-carbon ferromanganese, medium-carbon ferromanganese, low-carbon ferromanganese, metal manganese, specular iron, silicon-manganese alloys, etc. In steelmaking, ferromanganese alloy is an important deoxidizer and alloy additive, which plays the role of deoxidation and alloying. The mass fraction of manganese in carbon steel is generally 0.25%-0.8%. Manganese can dissolve in ferrite to strengthen ferrite, and can also dissolve in cementite to increase its hardness. Manganese also increases and refines pearlite, which increases the strength and hardness of steel. Manganese can form MnS with sulfur to eliminate the harmful effects of...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/31G01N21/75
Inventor 刘建华戴文杰常欢
Owner INNER MONGOLIA BAOTOU STEEL UNION
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