Synthesis and formation mechanism of micro/nano flower-like MgCO3·5H2O

Yin, Wanzhong; Wang, Yulian; Ji, Qiang-dong; Yao, Jin; Hou, Ying; Wang, Lei; Zhong, Wenxing

doi:10.1007/s12613-014-0909-6

Cited by 13 publications

(7 citation statements)

References 14 publications

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“…The extracted magnesium is carbonated with CO2 in water solution forming nesquehonite or in a pressured fluidised bed giving magnesite [8][9][10]. By adding potassium dihydrogen phosphate (KH2PO4) lansfordite (MgCO3•5H2O) can be precipitated from Mg(OH)2 in water [11]. Conditions with low CO2 vapour pressure in the surrounding gas can result in reduction of 20% CO2 of the nesquehonite, in the Mg-CO3-H2O system, forming hydromagnesite irreversibly, shown in reaction (R3) below [12].…”

Section: Introductionmentioning

confidence: 99%

Thermal storage of (solar) energy by sorption of water in magnesium (hydro) carbonates

Erlund

Zevenhoven

2017

International Journal of Thermodynamics

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In this paper the thermodynamic properties and the chemical reaction kinetics of the reversible reactions where sorption of water in magnesium hydro carbonates are analysed for thermal energy storage (TES). Depending on the conditions mainly nesquehonite, lansfordite and hydromagnesite may be formed from magnesite, all with a certain heat effect. Magnesite and water vapour can form nesquehonite or lansfordite via reaction (R1) and (R2):Compared to other chemical sorption compounds, its advantages are low operating temperatures while they can act as a fire retardant. Experimental data is presented on the reactivity of the dehydration at various temperatures. The rate of dehydration of the nesquehonite is sufficient at low temperatures such as 50 °C and the reaction is about 90 % completed after 120 minutes. Magnesite reaches partial re-hydration to about 37% conversion after 24 hours. For better contact between reagents, mixtures with silica gel were used. A too large amount of water vapour, causing condensation of the water, appears to make the reactions irreversible. The temperatures of operating the process are presented as well as which compounds give an optimal energy storage.

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Section: Introductionmentioning

confidence: 99%

Thermal storage of (solar) energy by sorption of water in magnesium (hydro) carbonates

Erlund

Zevenhoven

2017

International Journal of Thermodynamics

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“…37,39 Owing to the Brownian motion kinetics, the growth of the nuclei continued as they collided with each other during flowing up, forming fluidized magnesium carbonate crystals. In the granulation phase, the crystals contained Mg− H, Mg−O, C−O, C−H, and O−H bonds, 48,49 and every water molecule and bicarbonate ion were joined by hydrogen bonds (Figure 6b). The crystallized orthorhombic magnesium carbonate trihydrate, which was the aggregate of the primary crystals, formed with a flower-like monocrystal shape.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…The crystallized orthorhombic magnesium carbonate trihydrate, which was the aggregate of the primary crystals, formed with a flower-like monocrystal shape. 48 The hydraulic turbulence permitted the aggregates' compaction in the reactor's upper part. The grown particles turned to be dense and descended to the middle region, in which cluster agglomeration occurred.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Recovery of Magnesium from Industrial Effluent and Its Implication on Carbon Capture and Storage

Tran

et al. 2021

ACS Sustainable Chem. Eng.

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Municipal and industrial wastewater can be a potential source of magnesium. Therefore, the development of magnesium recovery technology can both release the burden of wastewater treatment and help recycle the metal, which is in highmarket demand. Also, the recovery of magnesium in the form of magnesium carbonate has an implication on carbon capture and storage (CCS). In this study, fluidized bed homogeneous crystallization (FBHC) was employed for the recovery of magnesium from actual industrial effluent. The optimal conditions for the operation of FBHC were pH, 11.3; [Mg 2+ ]/[CO 32− ], 1.2; surface loading rate, 1.8 kg/m 2 h; and upflow velocity, 15.5 m/h, where the total recovery (TR) and crystallization (CR) efficiencies reached 88.5 and 85.4%, respectively. The recovered products were of high purity (93.5%) and in the form of nesquehonite (MgCO 3 •3H 2 O) pellets (size 1.2 mm), which could be further reused easily. From the scanning electron microscopy analysis, it was observed that they possessed a round shape and a smooth surface. In summary, FBHC is a promising recovery technology for magnesium-rich wastewater, where carbon capture and storage can be simultaneously integrated.

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“…Based on the results of the literature, IR absorption bands at 1420 cm -1 , 1098 cm -1 and 860 cm -1 indicate the formation of bulk carbonates phase [31][32][33][34], and those at 3300 cm -1 and 1650 cm -1 indicate that the synthesized material is a hydrated carbonate [31].…”

Section: 22mentioning

confidence: 96%

Synthesis, characterization and low-temperature carbonation of mesoporous magnesium oxide

Hamdi

Vieille

Nahdi

et al. 2019

J Therm Anal Calorim

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To cite this version:Sondes Hamdi, Laetitia Vieille, Kais Nahdi, Loïc Favergeon. Synthesis, characterization and low temperature carbonation of mesoporous magnesium oxide. AbstractA sample of MgO was successfully synthesized using thermal decomposition of hydromagnesite and compared to commercial material. The characterization of materials using XRD, SEM, BET and BJH methods showed that the thermal decomposition way led to rectangular mesoporous micro-sheets with high specific surface area of 100 m 2 g -1 . This porous magnesium oxide has been shown to be a potential candidate for CO 2 capture at low temperatures range (30 and 50° C), low pressures of CO 2 (P CO2 = 600 mbar) and in the presence of water vapor (P H2O = 15 mbar). In these conditions our results show that 11% of MgO was converted to hydrated magnesium carbonate MgCO 3 .3H 2 O after 8h of carbonation in a thermobalance, and reached 54% after 24h of carbonation using tube furnace. After carbonation hydration reaction pore size and surface area have noticeably changed.

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Synthesis and formation mechanism of micro/nano flower-like MgCO3·5H2O

Cited by 13 publications

References 14 publications

Thermal storage of (solar) energy by sorption of water in magnesium (hydro) carbonates

Thermal storage of (solar) energy by sorption of water in magnesium (hydro) carbonates

Recovery of Magnesium from Industrial Effluent and Its Implication on Carbon Capture and Storage

Synthesis, characterization and low-temperature carbonation of mesoporous magnesium oxide

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