Thermal characterization and kinetic analysis of nesquehonite, hydromagnesite, and brucite, using TG–DTG and DSC techniques

Ren, Huazhong; Chen, Zhen; Wu, Yulong; Yang, Mei; Chen, Jin; Hu, Husheng; Liu, Ji

doi:10.1007/s10973-013-3372-0

Cited by 64 publications

(27 citation statements)

References 49 publications

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“…[32] Thermal gravimetric analysis performed on nesquehonite ( Figure 5) showed a total mass loss on ignition of 70.9%, which is in agreement with the total mass loss of pure synthetic nesquehonite. [4,12,15,[20][21][22][23] The mass loss between 25°C and 390°C is 38.9%. From 390°C up to 1,100°C, nesquehonite loses the remaining 32% of its total mass with decarbonation occurring at higher temperatures.…”

Section: Resultsmentioning

confidence: 99%

“…Peaks at 453°C and 498°C belong to the CO 2 loss. [4,12,15,20,21,23] The exothermic peak at 482°C is assigned to the rapid crystallization of magnesite (MgCO 3 ), which is thermodynamically more stable at these temperatures. [15,20,21,23] The endothermic peak at 498°C is attributed to magnesite decarbonation and MgO formation.…”

Section: Resultsmentioning

confidence: 99%

“…that between 170°C and 200°C, the mass loss was 12.1%. According to Ren [21] in the temperature range 25°C-200°C, nesquehonite with the chemical formula Mg (HCO 3 )(OH)•2H 2 O loses two molecules of H 2 O. Thermal treatment of nesquehonite at temperatures of 295°C, 350°C, and 390°C resulted in the formation of magnesium oxide carbonate as indicated by the new Raman peaks at~1,282, 1386, and 1,410 cm −1 and the new FT-IR peak at 2,340 cm −1.…”

Section: Discussionmentioning

confidence: 99%

“…Over the time, it has been suggested that there are two structural isomers of nesquehonite, [12,13,20] with the pH being the key factor for which isomer is formed. Studies on thermal stability and thermal decomposition of nesquehonite [4,15,[20][21][22][23][24] showed that nesquehonite remains relatively unaffected up to 100°C [15] ; a dispute exists about thermal decomposition of nesquehonite above this temperature, partly due to different synthesis processes performed in each study.…”

Section: Introductionmentioning

confidence: 99%

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

Skliros

Tsakiridis

Perraki

2019

J Raman Spectroscopy

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Nesquehonite synthesized by mixing MgCl2·6H2O and Na2CO3 at T 25°C, was thermally treated at various temperatures (170°C, 200°C, 295°C, 350°C, and 390°C), based on thermal analysis study of raw nesquehonite. The mineral phases formed at each temperature were studied by means of Raman microspectroscopy, Fourier transform infrared spectroscopy, and X‐ray diffraction. After thermal treatment of raw nesquehonite above 295°C, its dominant Raman peak at 1,100 cm−1, which corresponds to the v1 CO32− antisymmetric stretching vibrations, exhibits broadening and upshift of up to 10 cm−1, whereas the Raman peaks at 707 cm−1, at 770 cm−1, at 1,425 cm−1, and at 1,710 cm−1 disappear, and new Raman peaks arise at 1,282 cm−1 and at 1,386 cm−1. The latter have been attributed to the decomposition of HCO3−, in accordance with the Fourier transform infrared spectroscopy study. According to the differential thermal analysis study, water of crystallization is lost in two steps until 295°C; therefore, the phase studied above this temperature corresponds to Mg (HCO3)(OH). The Raman peak at 3,550 cm−1 assigned to the existence of OH−, exhibits weakening after thermal treatment. Our results corroborate a Mg (HCO3)OH·2H2O nesquehonite formula.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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

Skliros

Tsakiridis

Perraki

2019

J Raman Spectroscopy

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“…Magnesium oxide with high chemical activity can be obtained by optimizing the technological parameters including calcination temperature and soaking time. The most reactive MgO produced at the lowest calcination temperature with the highest surface area and the smallest crystallite size is required for the latest application [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

An experimental investigation of hydration mechanism of the binary cementitious pastes containing MgO and Al2O3 micro-powders

Madej

Prorok

Wiśniewska

2018

J Therm Anal Calorim

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The reactivity of the binary mixtures of reactive magnesia and hydratable alumina micro-powders with various compositions was investigated by calorimetric method, X-ray diffraction, simultaneous DSC-TGA with thermal evolved gas analysis-mass spectrometry and scanning electron microscope observations. The effect of the MgO/Al 2 O 3 molar ratio (2:1, 1:1 and 1:2) and temperature on the hydration behavior of pastes has been explored using the TAM Air isothermal calorimetry system at 25 and 50°C. Some structural aspects of a M-A-H (M:MgO, A:Al 2 O 3 , H:H 2 O) binding phase formed upon the hydration of MgO-Al 2 O 3 micro-powders at different curing time have been explored. The main hydrate considered to be important in this system is hydrotalcite Mg 6 Al 2 CO 3 (OH) 16 Á4H 2 O formed via the isomorphous substitution of Mg 2? ions by trivalent Al 3? one in the brucite-like sheet. This was expressed as a systematic shift of the peak at 2-theta value corresponding to the (003) reflection. Since both hydrotalcite and brucite are identified in the hydrating samples, the thermal stability of hydroxyls in these hydration products can be placed in the decreasing order as follows: (Mg2Al)-OHhydrotalcite group [ (Mg3)-OH-brucite group [ (Mg3)-OH-hydrotalcite group.

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The effects of solvent and microwave on the preparation of Magnesium Oxide Precursor

Chen

et al. 2014

Crystal Research and Technology

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Four methods including hydrothermal method, glycolhydrothermal method, microwave-hydrothermal method and glycol-microwave-hydrothermal method were used to prepare magnesium oxide precursor by the reaction of MgSO 4 ·7H 2 O with (NH 4 ) 2 CO 3 . The composition, crystallinity, morphology, aspect ratio, yield, functional groups, atom distribution, and interplanar spacing of the sample were investigated by X-ray diffraction (XRD), Scan Electron Microscope (SEM), Fourier Transform Infrared Spectroscopy (FT-IR), and High Resolution Transmission Electron Microscope (HRTEM). The properties of Magnesium Oxide precursor were compared with each other. The results of FT-IR and XRD showed that the crystals were all nesquehonite. However, it was shown by FT-IR results that the crystals prepared by glycol-microwave-hydrothermal method contained OH − and HCO 3 − groups, which indicated that the Mg(OH)(HCO 3 )·2H 2 O type crystals would be facilitated by this method. The glycol-hydrothermal method can create high quality Magnesium Oxide precursor with a high degree of crystallinity, high purity, high aspect ratio, smooth surface, and good dispersibility.

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Thermal characterization and kinetic analysis of nesquehonite, hydromagnesite, and brucite, using TG–DTG and DSC techniques

Cited by 64 publications

References 49 publications

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

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

An experimental investigation of hydration mechanism of the binary cementitious pastes containing MgO and Al2O3 micro-powders

The effects of solvent and microwave on the preparation of Magnesium Oxide Precursor

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