Determination method for mass fraction of impurity elements contained in steel

A technology of mass fraction and impurity elements, which is applied in the field of metallurgy, can solve problems such as inability to jointly measure, and achieve the effects of reducing emissions, reducing risks, and improving work efficiency

Inactive Publication Date: 2014-02-12
GUANGXI YUCHAI MASCH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method requires the use of high-risk perchloric acid fumes and sulfuric acid fumes to prepare test solutions, and it cannot be combined with silicon, manganese, phosphorus, etc. in pig iron and cast iron

Method used

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Embodiment Construction

[0016] In order to better clarify the content of the present invention, the present invention will now be described in detail with non-limiting examples.

[0017] 1 Configuration of chemical reagents: (unless otherwise specified, only use analytically pure reagents and distilled water or water of equivalent purity)

[0018] 1.1 Dissolved acid: sulfur nitric mixed acid

[0019] Mix 94 parts of water, 5 parts of concentrated sulfuric acid (1.84g / mL), and 1 part of nitric acid (1.42g / mL).

[0020] 1.2 Ammonium persulfate solution, 500g / L

[0021] Weigh 50 grams of ammonium persulfate and dissolve in a small amount of water, dilute to 100 mL with water, and shake well. Prepared on the same day and used on the same day.

[0022] 1.3 Hydrogen peroxide, 1.11g / mL

[0023] 1.4 iodine solution, 2.5g / L

[0024] Weigh 1.25 g of potassium iodide dissolved in water, add 0.64 g of iodine while stirring, stir well to dissolve and set the volume in a 500 ml brown bottle.

[0025] 1.5 sul...

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Abstract

The invention provides a determination method for the mass fraction of impurity elements contained in steel. The determination method comprises the following steps of dissolving a specimen by soluble acid, dropping ammonium persulfate solution, continuously heating and boiling, completing decomposition of ammonium persulfate, dropping hydrogen peroxide, lightly shaking to enable the solution to be clear, heating, boiling and decomposing excessive hydrogen peroxide; dividing the obtained test solution into multiple parts for spare use; adding a part of the test solution to be detected into acid medium, then adding a reducing agent, absorbing escaped arsenic hydride by iodine solution, reducing to generate arsenic molybdenum blue with ammonium molybdate, and calculating and determining the mass fraction of the arsenic on the basis of light absorbance of the arsenic molybdenum blue. The determination method further comprises the step of determining the mass fractions of silicon, manganese and phosphorus elements in other parts of test solution. The determination method provided by the invention has the advantages that the test material decomposition and the test solution preparation are not needed additionally and independently, conjoint analysis can be realized, and a reagent is saved; process operations of distillation and separation and the like are not needed; compared with the method for treating the test solution by discharging perchloric acid smoke and sulfuric acid smoke, the determination method provided by the invention has the beneficial effects that the emission of toxic and harmful gas is reduced and the risk is lowered.

Description

technical field [0001] The invention relates to chemical testing in the field of metallurgy, in particular to a method for measuring the mass fraction of impurity elements contained in iron and steel. Background technique [0002] Arsenic is a harmful element in steel materials, and its content must be effectively controlled. At present, the chemical analysis methods of arsenic content in pig iron and cast iron mainly include extraction of arsenic molybdenum blue photometry, hypophosphite reduction iodometric method, distillation and separation of molybdenum blue photometry, etc. None of these methods can be combined with conventional impurity elements such as silicon, manganese, and phosphorus in pig iron and cast iron. [0003] At the same time, the existing method for the determination of arsenic content in iron and steel materials is to dissolve the sample to be determined with nitric acid, fume perchloric acid to chromium oxide to hexavalent, add hydrazine sulfate and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/31
Inventor 刘万疆庞建召叶轶周一平刘作德
Owner GUANGXI YUCHAI MASCH CO LTD
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