Spectroscopy and Spectral Analysis, Volume. 44, Issue 6, 1697(2024)
Micro-Raman Spectral Characteristics and Implication of Magnetite in Gongchangling Iron Mine
Gongchangling iron mine is the largest BIF-hosted high-grademagnetite ore deposit in China, various scholars have carried out many researches, however few studies are related to Raman spectra of magnetite. This paper measured the Raman spectra of magnetite in typical BIF ore and high-grade iron ore of Gongchangling by HORIBA XploRAPLUS micro-Raman spectrometer. The results show that the peaks of magnetite in BIF at 300, 550 and 670 cm-1 shift to high wavenumber, which should be related to the increase of the average oxidation state of magnetite in BIF and the decrease of miner allattice size caused by the isomorphic substitution of trace elements. The Raman peak intensities of magnetite in high-grade iron ore increase obviously, probably due to the decrease of the overall content of trace elements and, correspondingly, the relative increase of iron ion content in magnetite. Some magnetites in BIF ore show weak Raman spectral features of hematite, which may be related to the epigenetic oxidation after the formation of magnetite. X-ray diffraction (XRD) analysis shows that the main iron mineral in the high-grade ore is magnetite, whereas the magnetite in the BIF ore is more similar to magnesioferrite. The results of SEM-EDS suggest that the contents of trace elements in the magnetite from high-grade iron ore are lower than those from BIF ore, i.e., experiencing the process of “purification”, which is consistent with the abovementioned conclusion. The research indicates that Raman spectra measurement is proven to be a fast, simple, reproducible and non-destructive method and can be used to estimate the overall content of trace elements of magnetite and further distinguish the magnetite both in BIF and high-grade iron ores of Anshan-Benxi area.
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LIU Jing, YAO Yu-zeng, FU Jian-fei, LI Zi-ning, HOU Ting-ting, ZHANG Yong-li. Micro-Raman Spectral Characteristics and Implication of Magnetite in Gongchangling Iron Mine[J]. Spectroscopy and Spectral Analysis, 2024, 44(6): 1697
Received: Mar. 15, 2023
Accepted: --
Published Online: Aug. 28, 2024
The Author Email: Yu-zeng YAO (yaoyuzeng@mail.neu.edu.cn)