Determination method for mass fraction of impurity elements contained in steel

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 ...

AI Technical Summary

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