Basic Research On Rapid Detection Technology Of Rare Earth In Steel

The core of"Made in China 2025"is to vigorously develop high-end equipment manufacturing.In order to meet the special requirements of high-end equipment manufacturing for steel,the use of rare earths to improve the performance of steel has become a research hotspot for high-performance materials and promotes the development of rare earth steels.In order to give full play to the unique role of rare earth in steel and meet the requirements of fast-paced production on site,it is particularly important to quickly and accurately determine the content of rare earth elements in steel.Full-spectrum spark direct reading spectroscopy is the most common method for rapid analysis and detection of element content in steel.However,the existing spark direct-reading spectrometer cannot measure the rare earth content in steel because there is no rare earth standard working curve.In response to this practical problem,the research team carried out basic technical research work such as calibration sample preparation and standard working curve drawing to lay the foundation for the rapid detection of rare earths in steel by full-spectrum spark direct reading spectroscopy.The conclusions obtained are as follows:(1)The vacuum induction melting-forging-rolling process is used to prepare a series of calibration samples with high,medium and low content,and the samples meet the uniformity requirements.Then use full-spectrum spark direct reading spectroscopy to compare and analyze the intensity ratio of rare earth in the calibration sample.The result shows that the relative standard deviation RSD is less than 5%,which verifies that the calibration sample meets the uniformity requirements and provides sample guarantee for the normal development of subsequent tests.(2)Use ICP-AES to calibrate the content of lanthanum,cerium,and yttrium in the sample;on a full-spectrum spark direct-reading spectrometer,study the sample that has been calibrated with ICP-AES for the content of lanthanum,cerium,and yttrium,and read it And record the relevant analysis spectrum of lanthanum,cerium and yttrium in steel,build a database of the corresponding relationship between calibration values and physical objects,draw standard working curves of rare earth lanthanum,cerium,and yttrium in steel,and establish mathematical models as follows:y_La=3.22349*10⁷ x²+4.28844*10⁶x+25428.92497y _Ce=7.64406*106 x²+56595.00751x+9775.3159y _Y=1.94724*10⁸ x²+3.16856*107x+89329.93426(3)Through the evaluation of the full-spectrum spark direct-reading spectrum detection results,the range of the detection results of lanthanum,cerium,and yttrium in the test sample is obtained,and the ICP-AES measured values of lanthanum,cerium,and yttrium in the test sample are directly read with the full-spectrum spark The comparison of the measured values shows that there are differences in the test results,but the overall relative deviation is small,and the deviation value is within the range of the test results or the test requirements.At the same time,the test results of lanthanum,cerium and yttrium in the test sample all meet the test of F_0.975(7,7)<F<F_0.025(7,7),which is subject to the statistics of the F distribution.It proves that the data has good repeatability and high accuracy,and it also shows that the accuracy of the standard working curve is good.