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Method for determination of rare-earth content in nodularizer

A measurement method and technology of nodulizers, which are applied in the direction of material analysis by observing the influence of chemical indicators, preparation of test samples, analysis by making materials undergo chemical reactions, etc., can solve the problem of difficult composition, etc. Achieve high accuracy and precision, fast gradient effect

Inactive Publication Date: 2007-03-07
SICHUAN DONGFENG ELECTRIC MACHINARY WORKS CO LTD
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Problems solved by technology

However, it is difficult to directly determine its composition by spectrophotometry

Method used

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Embodiment Construction

[0020] Further illustrate technical scheme of the present invention by embodiment below: the assay method of rare earth content in the nodulizer, it may further comprise the steps:

[0021] (1) Test solution preparation: dissolve the sample with nitric acid and hydrofluoric acid, decompose excessive hydrofluoric acid with boric acid, and decompose the nitrogen dioxide produced by the dissolution with urea to obtain a weakly acidic sample solution;

[0022] (2) Measuring rare earth: in the sulfuric acid-nitric acid medium of PH0.5-0.95, azochlorophosphine-III forms a 1:1 blue complex with rare earth elements, and its maximum absorption wavelength is 680nm. Iron, titanium, Interfering elements such as calcium are masked with oxalic acid and can be directly determined by photometry.

[0023] Wherein, the described test solution preparation step comprises the following sub-steps:

[0024] (1) Accurately weigh 20 mg of standard samples of nodulizers with different rare earth conte...

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Abstract

This invention discloses one nodularizer rare earth content testing method, which comprises the following steps: making test liquid and silicon, and the specimen liquid process steps are composed of aqua fortis and fluohydric acid specimen resolving, using boracic acid resolving over fluohydric acid to resolve the generated dinitrogen tetroxide by to process weak acid specimen liquid; the silicon process steps comprises the following steps: forming blue complex compound with azophosphon and rare earth element with largest absorption wavelength as 680nm with iron, titanium and calcium as mask with oxalic acid and with other metal element independent to measure the rare earth content by spectrophotometer.

Description

technical field [0001] The invention relates to a method for measuring rare earth content in a nodulizer. Background technique [0002] The nodulizer is an iron alloy with high content of silicon, magnesium and rare earth. Spectrophotometry is the easiest way to measure the content of silicon, magnesium and rare earth in the nodulizer. However, it is difficult to directly determine its composition by spectrophotometry. Contents of the invention [0003] The object of the present invention is to provide a kind of measuring method of rare earth content in the nodulizer. In this method, nitric acid and hydrofluoric acid are used to dissolve the sample, and the sample dissolution time is well controlled. Excessive hydrofluoric acid is decomposed with boric acid, and the dissolved nitrogen dioxide is decomposed with urea. Chlorophosphine-III and rare earth elements form a 1:1 blue complex, and its maximum absorption wavelength is at 680nm. Interfering elements such as iron, t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/78G01N1/28
Inventor 喻伦友
Owner SICHUAN DONGFENG ELECTRIC MACHINARY WORKS CO LTD
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