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Method for determining total iron in vanadium titano-magnetite by using acid dissolution method

A vanadium-titanium magnetite and acid-dissolving technology, which can be used in chemical analysis by titration, material analysis by observing the influence of chemical indicators, and analysis by making materials undergo chemical reactions, etc., can solve the problems that cannot meet the requirements of rapid Determination needs, operation is more complicated than acid-soluble method, and alkali-fusion method has a long process, so as to reduce labor expenditure, shorten the operation process and save medicines

Inactive Publication Date: 2015-03-04
INNER MONGOLIA BAOTOU STEEL UNION
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Problems solved by technology

[0005] The methods for determining TFe in vanadium-titanium magnetite include acid-soluble method, alkali-fusion method, inductively coupled plasma method, X-ray method, microwave digestion ICP-OES method, etc. The alkali-fusion method has a long process and is more complicated than the acid-soluble method. Meet the needs of rapid determination in production, but the use of large instruments requires higher costs

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  • Method for determining total iron in vanadium titano-magnetite by using acid dissolution method

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[0026] The above-mentioned and other technical features and advantages of the present invention will be described in more detail below in conjunction with the embodiments.

[0027] 1. Method summary:

[0028] The sample is dissolved by sulfuric acid-phosphoric acid mixed acid, in the hydrochloric acid medium, a large amount of ferric iron is reduced with stannous chloride, vanadium is oxidized with potassium permanganate, sodium tungstate is used as indicator, trivalent iron is reduced with titanium trichloride Valence iron is reduced to divalent iron, and excess titanium trichloride is oxidized with potassium dichromate until the "tungsten blue" blue color disappears. Using sodium diphenylamine sulfonate as an indicator, titrate with potassium dichromate to determine the iron content.

[0029] 2. Reagents:

[0030] 2.1: hydrochloric acid (concentration is 50%);

[0031] 2.1 Sulfuric acid-phosphoric acid mixed acid (2 parts of sulfuric acid (sulfuric acid concentration is 9...

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Abstract

The invention relates to a method for determining total iron in vanadium titano-magnetite by using an acid dissolution method. The method comprises the following steps: dissolving a sample with sulfuric acid-phosphate mixed acid; in a hydrochloric acid medium, using stannous chloride to reduce a great amount of ferric iron, using potassium permanganate to oxidize vanadium, using sodium tungstate as an indicator, using titanium trichloride to reduce ferric iron to diatomic iron, oxidizing excessive titanium trichloride with potassium dichromate until tungsten blue fades, using sodium diphenylaminesulfonate as an indicator, and determining the content of iron with potassium dichromate titration. Compared with determination with an alkali fusion method, the method greatly shortens the operating process, saves drugs, reduces human resource cost, and improves the production efficiency; as the potassium permanganate oxidation process is adopted, the interference of vanadium on iron is eliminated, the determination results are stable, and data is accurate.

Description

technical field [0001] The invention relates to the technical field of iron ore analysis, in particular to a method for determining total iron in vanadium-titanium magnetite by using an acid dissolution method. Background technique [0002] Vanadium-titanium magnetite is an important mineral resource. Vanadium-titanium magnetite has strong magnetism and is a paragenetic ore containing various metals such as Fe, V, and Ti. [0003] Vanadium is known as the "monosodium glutamate" of modern industry. It is widely used in the fields of steel, chemical industry and aviation. 85% of it is used in the steel industry. Adding 0.1% vanadium can increase the strength of steel by 10%-20% and reduce the weight of the structure by 15- 25%, reducing the cost by 8-10%. Since the vanadium in the alloy can hardly be extracted for reuse, only a small amount of vanadium-based catalyst and vanadium in the vanadium alloy can be regenerated and recycled, and the renewability of vanadium is poor. ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N31/16G01N21/79
Inventor 李虹刘建华周春玲邹新萍
Owner INNER MONGOLIA BAOTOU STEEL UNION
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