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Preparation and Spectral Characteristics of Mn2+ Doped Nephrite Tailings Glass |
TAO Long-feng1, 2, LIU Chang-jiang2, LIU Shu-hong3, SHI Miao2, HAN Xiu-li1* |
1. College of Mining Engineering, North China University of Science and Technology, Tangshan 063210, China
2. School of Gemmology and Materials Science, Hebei Geological University, Shijiazhuang 050031, China
3. Hebei Geological Experiment and Testing Center, Baoding 071000, China
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Abstract Nephrite, also known as He tian Yu, is one of China's earliest and most popular natural jade material. Thanks to China's element connoted in the “Jin Xiang Yu” gold medal used in the 2008 Beijing Olympic Games, the jade has been re-understanding by people and shows increasing demand in the market. As a result, more nephrite has been exploited with more tailing produced, leaving the situation of resource wasting and environmental pollution. Therefore, it is of great theoretical and practical significance to the high-value utilization of nephrite tailings. The main mineral composition of nephrite is tremolite, with ideal crystal formula of [Ca2Mg5Si8O22(OH)2]. It is a typical double-chain silicate, which can be used as an important natural raw material for silicate glass. The nephrite glass was obtained by firstly melting the raw material at 1 500 ℃ for 2 h, then pouring the melt into an iron mould immediately and finally annealing at 600 ℃ for 2 h. Results showed that with the increase of MnO content, there was a deepening tendency in color of the tailings glass to brownish yellow, transparent, glass luster, clean inside, no crack, refractive index, and increasing tendencies in dielectric content and relative density. Four nephrite tailings glass samples with spectral characteristics were investigated by XRF, FTIR, Raman spectrometer and UV-Vis-NIR spectrometer, and the effects of Mn2+ content on the quality and color of nephrite tailings glass were discussed. The results show that the spectral peaks near to 1 370 and 1 500 cm-1 in both infrared and Raman spectra were attributed to the gas molecules dissolved in nephrite tailings glass melt; When the content of MnO is 1%, the infrared spectra of sample Tb-3 is in the range of 450~500 cm-1, and the peak intensity of vibration spectrum is significantly stronger than that of the other three samples. The difference between infrared and Raman spectra indicates that the energy of the Si—O bond in the internal structure of Mn2+ nephrite tailings becomes stronger firstly and then weaker, leading to the densest internal structure at MnO of 1%. Compared the chemical composition and UV-vis-NIR spectra with the results of chemical analysis, it is suggested that the color of nephrite tailings glass is due to the combination of Fe and Mn elements. The charge transfer generated by Fe2+-Fe3+ pair makes the blue-violet region (400~460 nm) produce a wide absorption band, and the outermost d—d electron jump of Mn2+ makes the blue-green region (480~550 nm) produce a wide absorption band generating the transmittance in the yellow, orange region, and further producing brownish-yellow. This research confirmed the preparation process and spectral characteristics of Mn2+ doped nephrite tailings glass, discussed its application prospect, and provided a scientific direction for the high-value utilization of nephrite tailings, suggesting important theoretical research and application values.
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Received: 2022-04-11
Accepted: 2022-10-07
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Corresponding Authors:
HAN Xiu-li
E-mail: hanxl1965@126.com
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