XRD and TEM analyses of a simulated leached rare earth ore deposit: Implications for clay mineral contents and structural evolution

Jin, Xiongwei; Chen, Lingkang; Chen, Hạixia; Wang, Wenjing; Ji, Hong; Deng, Shaofu; Jiang, Lei

doi:10.1016/j.ecoenv.2021.112728

Cited by 24 publications

(9 citation statements)

References 69 publications

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“…Quantitative analyses of the minerals were performed using the Rietveld method. Specifically, by applying this method, we use the X‐ray diffraction patterns of the dust samples to determine the material structure based on the height, width and position of the peaks in intensity of the diffraction patterns (Jin et al., 2021). The results of these analyses, that is, the proportions of the different materials constituting the samples, were normalized to 100% based on the assumption that the mineral contents of the samples were entirely accounted for by the XRD patterns.…”

Section: Methodsmentioning

confidence: 99%

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Uranium Isotopic Composition and Constraints on the Provenance of the Qinghai‐Tibet Plateau's Surface Dust

et al. 2022

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The production and emission of aeolian dust can provide key information on the contemporary and historical links between geological evolution and climate. Here we use 234U/238U isotope ratios and the uranium (U) comminution age method on samples collected from Qinghai‐Tibet Plateau (TP) surface dust and glacier snowpack/cryoconites to determine the erosion and potential transport provenance of the dust, regardless of petrological origin. The spatial variation of the (234U/238U) isotope ratios of TP dust showed relatively high values in the Songpan‐Ganzi‐Hoh Xil, Himalayan and the Kunlun‐Qaidam‐Qilian terranes, while showing relatively low (234U/238U) values in Lhasa and Qiangtang terranes, but among all samples the highest value appeared in the glaciation zone. Dust collected from nearby glacial areas with rugged terrain (e.g., the Qilian and Himalayan Mountains) have higher (234U/238U) values than those collected in the topologically flat non‐glacial areas. These differences are consistent with elevated erosion rates and dust comminution‐transport processes in glacial areas, which yield a major source for large quantities of fresh comminuted particles. Compared to sediments from other regions of the globe, the (234U/238U) values of the typical aeolian sinks (such as loess on the Loess Plateau and ice core dust, etc.) are generally lower in comparison to areas with high elevations where erosion rates are high. The (234U/238U) isotope values of TP dust tend to fall between the high‐elevation sites and the dust sinks, indicating the combined influence of short comminution times (tectonics, landscape dynamics, and glacial erosion) and long residence time on the TP. When compared with other central Asian dust sources, U‐Nd‐Sr isotope signatures in TP dust are distinct and can be thus used as an effective tracer of dust provenance. Using U isotopes, we show that dust originating from the TP undergoes long‐range transport and constitutes potentially significant component of the Asian and Northern Hemisphere atmospheric dust load.

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Section: Methodsmentioning

confidence: 99%

“…Quantitative analyses of the minerals were performed using the Rietveld method. Specifically, by applying this method, we use the X-ray diffraction patterns of the dust samples to determine the material structure based on the height, width and position of the peaks in intensity of the diffraction patterns (Jin et al, 2021).…”

Section: Mineral Composition Analysismentioning

confidence: 99%

Uranium Isotopic Composition and Constraints on the Provenance of the Qinghai‐Tibet Plateau's Surface Dust

et al. 2022

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“…For identification and quantification of the crystalline phases, refinement methods are used with computer software databases. This step relies on the analysis of chemical composition, selectivity and preferential direction, structural disorder and structural differences between clay minerals [ 89 , 90 ].…”

Section: Analysis Of the Approaches For Pozzolanic Activity Character...mentioning

confidence: 99%

Methods for Evaluating Pozzolanic Reactivity in Calcined Clays: A Review

Pinheiro¹,

Alexandre²,

Xavier³

et al. 2023

Materials

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The search for alternative materials to replace ordinary Portland cement has been the object of work that enhances the investigation of the use of pozzolanic materials and the reduction of the carbon footprint with supplementary cementitious materials. However, not all materials are available to meet the large-scale demand for cement replacement. A relevant exception is the calcined clay, a material found worldwide that, when subjected to appropriate heat treatment, presents pozzolanic reactivity and can be used as a supplementary material to cement. This review presents, through a systematic search, methods for measuring the pozzolanic reactivity of calcined clays, namely, direct, indirect, qualitative, quantitative, chemical and physical methods such as electrical conductivity (Lùxan), the force activity index, the modified Chapelle, R3, Frattini test, thermal analysis, X-ray diffraction and X-ray fluorescence spectrometry. The most usual methods to assess the pozzolanic reactivity of calcined clays were exposed and analyzed. It should be pointed out that there is greater use of the Frattini and modified Chapelle methods as well as the analysis of the mechanical strength behavior of the material in cementitious matrices. X-ray diffraction and thermal analysis were exposed as the most used correlation methods but it was also concluded that different tests are needed to generate accurate results.

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“…It is obviously that ber is the doped plant material in the plastic clay. The sample was identi ed as quartz and feldspar [40] by XRD analysis. Petrographic analysis of Sample DX-3-1 indicated the sample was of clay structure, and the debris was primarily composed of quartz (10% -15%), feldspar (10%-15%), and secondly biotite (5%-10%), etc.…”

Section: Analysis Of Plastic Clay Layermentioning

confidence: 99%

Study on the Painted Clay Sculptures of Ming Dynasty in Jingyin Temple of Taiyuan, China

Bai

Xia²,

Wang³

et al. 2022

Preprint

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The painted clay statues of Ming Dynasty in Grand Hall of Jingyin Temple not only boast exquisite design, unique style and complicated craftsmanship, but also have very high historical, artistic, scientific, social and cultural values. Unfortunately, damages in different forms were found since recent years and it is getting worse with the passage of time.For the reason, the comprehensive survey and scientific analysis of the statues of Ming dynasty of Jingyin Temple were conducted. In the survey, the structural features, the painting process, and historical characteristics of these statues were recorded in detail. In addition, a comprehensive study was performed on the materials and craftsmanship of the three painted clay statues by employing multiple analytical techniques, including polarized light microscope (PLM), scanning electron microscopy with energy dispersive spectrometry (SEM/EDS), Raman spectrometer, X-ray diffractometer (XRD), granulometry, etc. The result helps to reveal the moulding process of painted statues, and further provide novel information and a scientific basis for the mechanism research of cultural relic deterioration and the later restoration. It is hoped that this research can provide reliable basic information for studies in related fields.

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XRD and TEM analyses of a simulated leached rare earth ore deposit: Implications for clay mineral contents and structural evolution

Cited by 24 publications

References 69 publications

Uranium Isotopic Composition and Constraints on the Provenance of the Qinghai‐Tibet Plateau's Surface Dust

Uranium Isotopic Composition and Constraints on the Provenance of the Qinghai‐Tibet Plateau's Surface Dust

Methods for Evaluating Pozzolanic Reactivity in Calcined Clays: A Review

Study on the Painted Clay Sculptures of Ming Dynasty in Jingyin Temple of Taiyuan, China

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