A combined Raman, Fourier transform infrared, and X‐ray diffraction study of thermally treated nesquehonite

Skliros, Vasilios; Tsakiridis, P.E.; Perraki, Maria

doi:10.1002/jrs.5768

Cited by 5 publications

(4 citation statements)

References 32 publications

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“…This band was located in the 1400–1420 cm −1 region and represented a strong absorption band of the HCO 3 – unit [ 34 ]. This was slightly different from the absorption band of the HCO 3 – unit in the Nes raw material at 1394 cm −1 [ 35 , 36 ]. The two bands at 847 and 1101 cm −1 in the Nes spectrum, representing the absorption band of the CO 3 2– unit, did not appear in samples #3 and #4, as they may have been too weak to detect.…”

Section: Resultsmentioning

confidence: 78%

Effect of Low Nesquehonite Addition on the Hydration Product and Pore Structure of Reactive Magnesia Paste

et al. 2023

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Reactive magnesia cement is considered an eco-efficient binder due to its low synthesis temperature and CO2 absorption properties. However, the hydration of pure MgO–H2O mixtures cannot produce strong Mg(OH)2 pastes. In this study, nesquehonite (Nes, MgCO3·3H2O) was added to the MgO–H2O system to improve its strength properties, and its hydration products and pore structure were analyzed. The experimental results showed that the hydration product changed from small plate-like Mg(OH)2 crystals to interlaced sheet-like crystals after the addition of a small amount of Nes. The porosity increased from 36.3% to 64.6%, and the total pore surface area increased from 4.6 to 118.5 m2/g. At the same time, most of the pores decreased in size from the micron scale to the nanometer scale, which indicated that Nes had a positive effect on improving the pore structure and enhancing the compressive strength. Combined with an X-ray diffractometer (XRD), a Fourier transform infrared spectrometer (FTIR), and a simultaneous thermal analyzer (TG/DSC), the hydration product of the sample after Nes addition could be described as xMgCO3·Mg(OH)2·yH2O. When Nes was added at 7.87 and 14.35 wt%, the x-values in the chemical formula of the hydration products were 0.025 and 0.048, respectively. These small x-values resulted in lattice and property parameters of the hydration products that were similar to those of Mg(OH)2.

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Section: Resultsmentioning

confidence: 78%

Effect of Low Nesquehonite Addition on the Hydration Product and Pore Structure of Reactive Magnesia Paste

et al. 2023

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“…2in the crystal structure (Mg (HCO 3 )(OH)•2H 2 O describes it better [21]). XRD analysis of the nesquehonite showed characteristic peaks at d = 6.52, 3.86, 3.04, 2.62, 2.51 and 1.92 Å, which correspond to Miller indices of {101}, {200}, {211}, {021}, {301} and {400} [22].…”

Section: Resultsmentioning

confidence: 99%

CO2-Mineralised Nesquehonite: A New “Green” Building Material

Kastrinakis

Skliros

Tsakiridis

et al. 2021

International Conference on Raw Materials and Circular Economy

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Synthetic nesquehonite with a Mg(HCO3)OH·2H2O chemical formula is a solid product of CO2 mineralization with cementitious properties. It constitutes an “MHCH” (magnesium hydroxy-carbonate hydrate) phase and, along with dypingite and hydromagnesite, is considered to be a promising permanent and safe solution for CO2 storage with potential utilization as a supplementary material in “green” building materials. In this work, synthetic nesquehonite-based mortars were evaluated in terms of their compressive strengths. Nesquehonite was synthesized by CO2 mineralization under ambient conditions (25 °C and 1 atm). A saturated Mg2+ solution was used at a pH of 9.3. The synthesized nesquehonite was subsequently studied by means of optical microscopy, X-ray diffraction (XRD) and scanning electron microscopy (SEM). Impurity-free nesquehonite formed elongated fibers, often around a centerpiece, creating a rosette-like structure. The synthesized nesquehonite was mixed with reactive magnesia, natural pozzolan, standard aggregate sand and water to create a mortar. The mortar was cast into 5 × 5 × 5 silicone mold and cured in water for 28 days. A compressive strength of up to 22 MPa was achieved. An X-ray diffraction study of the cured mortars revealed the formation of brucite as the main hydration crystalline phase. Carbon dioxide mineralized nesquehonite is a very promising “green” building material with competitive properties that might prove to be an essential part of the circular economy industrial approach.

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“…In addition to the crystal structure and chemical composition [60] , the depth and location of mineral characteristic absorption bands are also affected by mineral mixing, mineral particle size, mineral surface, and weathering effects [61] , which have a certain degree of variability, that is, the commonly called "same body with different spectrum" phenomenon. In addition, because of the similar mineral compositions of hydromagnesite and magnesite [62,63] , their spectral curves are difficult to distinguish, which significantly mineral spectral determination and recognition. Therefore, it is necessary to deeply understand the spectral characteristics of hydromagnesite and improve the ability to extract and recognize related information.…”

Section: Hydromagnesite Spectrummentioning

confidence: 99%

Hydromagnesite determination method based on Landsat8 and ZY1-02D data: A case study of the Jiezechaka Salt Lake in Tibet

Zhao,

Dai,

Zhao

et al. 2023

Preprint

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Hydromagnesite is a natural carbonate mineral that is widely distributed, but large sedimentary hydromagnesite deposits with industrial exploitation value are rare globally. In China, hydromagnesite is mainly distributed in the salt lake area of Qinghai-Tibet Plateau. Because of the harsh environment, it is difficult to use the traditional method to search for ore. Remote sensing technology has been successfully applied to research skarn, pegmatite lithium-beryllium, porphyry-epithermal, salt lake lithium, magmatic nickel-chromium, and orogenic gold deposits; however, research regarding remote sensing determination of hydromagnesite from salt lakes is lacking. We determined the mineral composition and content of hydromagnesite samples in the Jiezechaka area by X-ray diffraction (XRD), and the reflection spectral curve of the hydromagnesite samples was measured using an ASD FieldSpec4 short-wave infrared spectrometer. The analysis indicated three and seven absorption valleys with high and low absorption intensities, respectively, in the reflectance spectral curves of the hydromagnesite samples in the Jiezechaka area. Then, on this basis, we used Landsat8 OLI and ZY1-02D AHSI data, with the mixture tuned matched filtering (MTMF) method to extract hydromagnesite information around Jiezechaka Salt Lake in Tibet. A confusion matrix operation was used to compare the determination results of the two types of data. Among them, the overall accuracy of the extraction results based on Landsat8 data was > 67%, and the kappa coefficient was 0.668. The overall accuracy of the extraction results based on ZY1-02D data was > 72%, and the kappa coefficient was 0.743. Finally, using overlay analysis of the two kinds of data determination results, we concluded that hydromagnesite outcrops in the Jiezechaka area are mainly distributed in the northwestern and southeastern regions of the lake. This study provides a rapid assessment technique for measuring hydromagnesite information from salt lakes.

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A combined Raman, Fourier transform infrared, and X‐ray diffraction study of thermally treated nesquehonite

Cited by 5 publications

References 32 publications

Effect of Low Nesquehonite Addition on the Hydration Product and Pore Structure of Reactive Magnesia Paste

Effect of Low Nesquehonite Addition on the Hydration Product and Pore Structure of Reactive Magnesia Paste

CO2-Mineralised Nesquehonite: A New “Green” Building Material

Hydromagnesite determination method based on Landsat8 and ZY1-02D data: A case study of the Jiezechaka Salt Lake in Tibet

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