Method for detecting rare earth elements in steel

Abstract

The invention discloses a method for detecting rare earth elements in steel, comprising the steps of: sampling and sample dissolving: weighing a crushed steel sample, placing the crushed steel sample in a first container, adding nitric acid into the first container, heating till boiling, dropwise adding hydrochloric acid to completely dissolve the steel sample, and steaming to be almost dry to obtain a substance to be set with constant volume; setting volume: setting the volume of the substance to be set with the constant volume with the hydrochloric acid, and controlling the proportion of the steel sample to the hydrochloric acid to obtain a constant volume solution; ion exchanging: taking partial constant volume solution from the constant volume solution, to be used as a solution sample, leading the solution sample into an anion exchange resin column under a state with controlled flow velocity, collecting an outflow solution in a second container, washing unabsorbed rare earth elements with the hydrochloric acid, collecting the rare earth elements obtained through washing into the second container, controlling the volume of the collected solution, uniformly mixing to obtain a solution to be detected; and detecting: detecting the content of all rare earth elements in the solution to be detected by using an inductive coupling plasma emission spectrometer. The invention can be used for separating and detecting fourteen rare earth elements in a lanthanum series, has fewer steps and is convenient to operate.

Description

technical field [0001] The invention belongs to the technical field of metallurgical analysis, in particular to a method for measuring rare earth elements in steel. Background technique [0002] Trace rare earth elements are known as the vitamins of steel. The addition of rare earths to steel can improve the performance of the steel and make it have a satisfactory microstructure, thereby improving the physical properties such as strength and chemical properties such as oxidation resistance of the steel. [0003] The analysis of trace rare earths in steel is difficult, and the core problem is the overlapping interference of the ferrographic lines of the matrix. Many scholars believe that in order to avoid the spectral overlapping interference of ferrographic lines, it is necessary to separate the matrix iron. Regarding the method for the separation of trace rare earths in steel, the article published in Volume 130 of "Mikrochimica Acta" magazine in 1998 (Extraction Chromato...

AI Technical Summary

Problems solved by technology

However, ICP-MS equipment is expensive and requires high experimental conditions, making it difficult to popularize and apply

[0005] In addition to the shortcomings mentioned above, the methods listed above also have problems such as cumbersome operation, difficulty in ensuring the accuracy of determination, and lack of applicability.

For this reason, the industry is making great efforts to explore, but so far neither has the literature records that can make up for the technical problems of the aforementioned methods, nor has there been any successful reports.

Images