Modeling of phase relations and thermodynamics in the Mg(OH)2 + MgSO4 + H2O system with implications on magnesium hydroxide sulfate cement

Li, Dongdong; Gao, Dandan; Dong, Yaping; Wu, Li

doi:10.1016/j.calphad.2019.101675

Cited by 20 publications

(15 citation statements)

References 42 publications

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“…The solubility product reported by McGee and Hostetler shows only a small temperature dependency with -log(K) = 10.89 at 10 • C and -log(K) = 11.10 at 90 • C [42]. Especially at higher temperatures, the model based on these values shows a high deviation from solubility data found in the literature (see Figure 11) [20]. Dongdong et al conclude that the limitations in modeling the Mg(OH) 2 -H 2 O system are due to the general lack of reliable experimental data of the solubility of Mg(OH) 2 .…”

Section: Solubility Of Mg(oh) 2 In Watermentioning

confidence: 92%

“…Many studies have examined the stability of different hydrate forms of MgSO 4 [16][17][18][19][20]. Following the study by Li et [17].…”

Section: Magnesium Sulfate (Mgso 4 )mentioning

confidence: 99%

“…In a very recent study, Dongdong et al developed several thermodynamic models to describe the Mg(OH) 2 -H 2 O system based on the CALPHAD methodology [20]. The model describes the thermodynamic properties of the system through the Gibbs free energy.…”

Section: Solubility Of Mg(oh) 2 In Watermentioning

confidence: 99%

“…However, they found that using the previously described literature data to fit the model leads to inconsistent thermodynamic results. Whereas a model using the solubility product given by McGee and Hostetler to complement the determination of the Gibbs energy equation showed consistency at least in the temperature window from 0 • C to 50 • C [20,42]. The solubility product reported by McGee and Hostetler shows only a small temperature dependency with -log(K) = 10.89 at 10 • C and -log(K) = 11.10 at 90 • C [42].…”

Section: Solubility Of Mg(oh) 2 In Watermentioning

confidence: 99%

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Solubility Data of Potential Salts in the MgO-CaO-SO2-H2O-O2 System for Process Modeling

Weiß

Harasek

2020

Processes

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This review studies unwanted precipitation reactions, which can occur in SO2 absorption processes using a magnesium hydroxide slurry. Solubility data of potential salts in the MgO-CaO-SO2-H2O system are evaluated. The reviewed data can serve as a reliable basis for process modeling of this system used to support the optimization of the SO2 absorption process. This study includes the solubility data of MgSO3, MgSO4, Mg(OH)2, CaSO3, CaSO4, and Ca(OH)2 as potential salts. The solubility is strongly dependent on the state of the precipitated salts. Therefore, this review includes studies on the stability of different forms of the salts under different conditions. The solubility data in water over temperature serve as a base for modeling the precipitation in such system. Furthermore, influencing factors such as pH value, SO2 content and the co-existence of other salts are included and available data on such dependencies are reviewed. Literature data evaluated by the International Union of Pure and Applied Chemistry (IUPAC) are revisited and additional and newer studies are supplemented to obtain a solid base of accurate experimental values. For temperatures higher than 100 °C the available data are scarce. For a temperature range from 0 to 100 °C, the reviewed investigations and data provide a good base to evaluate and adapt process models for processes in order to map precipitations issues accurately.

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Section: Solubility Of Mg(oh) 2 In Watermentioning

confidence: 92%

“…Many studies have examined the stability of different hydrate forms of MgSO 4 [16][17][18][19][20]. Following the study by Li et [17].…”

Section: Magnesium Sulfate (Mgso 4 )mentioning

confidence: 99%

Section: Solubility Of Mg(oh) 2 In Watermentioning

confidence: 99%

Section: Solubility Of Mg(oh) 2 In Watermentioning

confidence: 99%

See 2 more Smart Citations

Solubility Data of Potential Salts in the MgO-CaO-SO2-H2O-O2 System for Process Modeling

Weiß

Harasek

2020

Processes

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“…The equilibrium of solid phase diagram and the solubility of different hydrated phases were consistent with those results obtained from experimental studies. Li et al [19] developed a temperature-dependent thermodynamic model for Mg(OH) 2 + MgSO 4 + H 2 O system based on CALPHAD approach. Thermodynamic properties of several magnesium hydroxide sulfate hydrates were determined as functions of temperature.…”

Section: Introductionmentioning

confidence: 99%

Fractal Analysis on Pore Structure and Hydration of Magnesium Oxysulfate Cements by First Principle, Thermodynamic and Microstructure-Based Methods

Huang

et al. 2021

Fractal Fract

123

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Magnesium oxysulfate (MOS) cement is a typical eco-friendly cementitious material, which presents excellent performances. In this work, a novel multiscale modeling strategy is proposed to simulate the hydration and pore structure of MOS cement system. This work collected and evaluated the Gibbs free energy of formation for main hydrates and equilibrium constant of main reactions in MOS cement system based on a first principle calculation using Material Studio. Followingly, the equilibrium phase compositions of MOS cement system were simulated through PHREEQC to investigate the molar ratio dependence of equilibrium phase compositions. Results showed that large M (MgO/MgSO4) was beneficial for the formation of 5Mg(OH)2·MgSO4·7H2O (Phase 517) and large H (H2O/MgSO4) tended to decompose MOS cement paste and cause leaching. The microstructure-based method visualized the hydration status of MOS cement systems at initial and ultimate stages via MATLAB and the results showed that large M was significant to reduce porosity, and similar results for the case of small H. Fractal analysis confirms that fractal dimension of pore structure (Df) was significantly decreased after the hydration of MOS and was positively correlated to the porosity of the paste. In addition, it can be referred that large M and small H were beneficial for modifying the microstructure of MOS paste by decreasing the value of Df.

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Development of a consistent geochemical model of the Mg(OH)2–MgCl2–H2O system from 25°C to 120°C

Knight,

Bryan,

Jové-Colón

2024

Applied Geochemistry

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Modeling of phase relations and thermodynamics in the Mg(OH)2 + MgSO4 + H2O system with implications on magnesium hydroxide sulfate cement

Cited by 20 publications

References 42 publications

Solubility Data of Potential Salts in the MgO-CaO-SO2-H2O-O2 System for Process Modeling

Solubility Data of Potential Salts in the MgO-CaO-SO2-H2O-O2 System for Process Modeling

Fractal Analysis on Pore Structure and Hydration of Magnesium Oxysulfate Cements by First Principle, Thermodynamic and Microstructure-Based Methods

Development of a consistent geochemical model of the Mg(OH)2–MgCl2–H2O system from 25°C to 120°C

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