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Method for measuring content of vanadium in nitrided ferrovanadium by oxidization and reduction

A technology of ferrovanadium nitride and content, which is applied in the direction of chemical analysis by titration method, to achieve the effect of saving drug cost, shortening time and improving speed

Inactive Publication Date: 2015-04-01
INNER MONGOLIA BAOTOU STEEL UNION
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Problems solved by technology

[0003] The purpose of the present invention is to solve the existing method to measure the vanadium in iron vanadium nitride when adding many types of medicines, large dosage, flow process, slow problem of operation, and to speed up the process at the same time. Operation speed, lower cost, provide a more rapid, accurate and efficient method for determining vanadium content in ferrovanadium nitride

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  • Method for measuring content of vanadium in nitrided ferrovanadium by oxidization and reduction
  • Method for measuring content of vanadium in nitrided ferrovanadium by oxidization and reduction
  • Method for measuring content of vanadium in nitrided ferrovanadium by oxidization and reduction

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Embodiment Construction

[0017] 1. Method summary:

[0018] The sample is dissolved in nitric acid, heated to smoke by adding phosphoric acid, rapidly added with ammonium nitrate to oxidize low-valent vanadium, eliminated the interference of manganese with sodium nitrite, and titrated with ferrous ammonium sulfate as the standard solution.

[0019] 2. Reagents:

[0020] 2.1 Nitric acid solution (Nitric acid with a density of 1.42g / mL mixed with an equal volume of water)

[0021] 2.2 Phosphoric acid (density 1.68g / mL)

[0022] 2.3 Ammonium nitrate (solid)

[0023] 2.4 Sulfuric acid (50g / L)

[0024] 2.5 urea (100g / L)

[0025] 2.6 Sodium nitrite (10g / L)

[0026] 2.7 N-phenylanthranilic acid (2g / L): Weigh 0.2g of N-phenylanthranilic acid, dissolve it in sodium carbonate solution (2g / L) and dilute to 100mL.

[0027] 2.8 Standard solution of ferrous ammonium sulfate: 0.05000mol / L

[0028] 3. Sampling and sample preparation

[0029] 4. Sample size

[0030] Weigh the sample 0.1000g.

[0031] 5. Anal...

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Abstract

The invention relates to a method for measuring content of vanadium in nitrided ferrovanadium by oxidization and reduction. The method comprises the following steps: getting a nitrided ferrovanadium test sample, dissolving the test sample in nitric acid, smoking with phosphoric acid, quickly adding ammonium nitrate to oxidize low valent vanadium after smoking; after eliminating the interferences of manganese by sodium nitrite, performing oxidization-reduction titration by taking ammonium ferrous sulfate as a standard solution, thereby calculating the content of vanadium in ferrovanadium. The method disclosed by the invention has the advantages of greatly shortening the smoking time by adopting phosphoric acid to smoke, reducing the adding types of reagents, simplifying the operation, ensuring the accuracy while increasing the speed, reducing the reagent adding types and the sulfuric acid adding amount, saving the reagent cost, shortening the time for heating and dissolving the sample and the smoking time, and lowering energy consumption.

Description

technical field [0001] The invention relates to a method for redox determination of vanadium content in ferrovanadium nitride, which belongs to the technical field of ferroalloy analysis in metallurgical chemistry. Background technique [0002] At present, the potassium permanganate oxidation method is mostly used for the determination of vanadium in ferrovanadium nitride. Nitric acid is used to decompose the sample, and sulfuric acid smokes. Under the appropriate acidity of sulfuric acid, vanadium is oxidized to pentavalent with potassium permanganate, excess potassium permanganate is decomposed with sodium nitrite, and excess sodium nitrite is decomposed with urea. Phenyl-anthranilic acid was used as indicator, and redox titration was carried out with ferrous ammonium sulfate standard solution. Because sulfuric acid is used for fuming, a large amount of high-concentration sulfuric acid is usually added. The temperature of sulfuric acid fuming is high, and it takes a long...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N31/16
Inventor 刘建华戴文杰常欢王宴秋
Owner INNER MONGOLIA BAOTOU STEEL UNION
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