Acquisition and evaluation of thermodynamic data for mirabilite-thenardite equilibria at 0.1 MPa

Wang, Yunsheng; Chou, I‐Ming; Zheng, Mianping; Hou, Xianhua

doi:10.1016/j.jct.2017.03.028

Cited by 9 publications

(4 citation statements)

References 30 publications

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“…Effect of temperature on solubility and the saturated solid-phase form of Na 2 SO 4 at 101.325 kPa. ▲, solubility data reported in the literature; ●, solubility determined in this work. Mir for mirabilite, Na 2 SO 4 ·10H 2 O; Th for thenardite, Na 2 SO 4 .…”

Section: Results and Discussionmentioning

confidence: 99%

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Phase Equilibria and Phase Diagrams for the Aqueous Ternary System Containing Sodium, Sulfate, and Metaborate Ions at 288.15 and 308.15 K and 101.325 kPa

Chen

Cui

et al. 2019

J. Chem. Eng. Data

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Solubilities and physicochemical properties (density and refractive index) for the ternary system (Na+//SO4 2–, BO2 –-H2O) at (288.15 and 308.15) K and 101.325 kPa were studied by the isothermal dissolution equilibrium method. Phase diagrams and diagrams of the physicochemical properties (density and refractive index) were plotted against the concentration of sodium sulfate. For both temperatures, the phase diagrams contained one invariant point, two univariant curves, and two crystallization regions corresponding to sodium metaborate tetrahydrate (NaBO2·4H2O, Nb) and mirabilite (Na2SO4·10H2O, Mir) at 288.15 K, and Nb and thenardite (Na2SO4, Th) at 308.15 K, respectively. The area of the crystallization region of sodium metaborate tetrahydrate was enlarged with the increase of temperature, and the solid phase of mirabilite transformed into thenardite when the temperature increased from 288.15 to 308.15 K. The physiochemical properties including density and refractive index of the system at (288.15 and 308.15) K were similarly increased first and decreased later with the increase of sodium sulfate concentration in the equilibrium solution. The experimental data of the density and refractive index were correlated using the empirical equations, and the calculated and experimental values agreed well.

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Section: Results and Discussionmentioning

confidence: 99%

“…When the temperature is higher than 305.53 K, the mass fraction of Na 2 SO 4 almost reaches a plateau, and the equilibrium solid phase transfers into thenardite. 21 In other words, the mineral mirabilite becomes anhydrous to form thenardite when temperature exceeds 305.53 K.…”

Section: Resultsmentioning

confidence: 99%

Phase Equilibria and Phase Diagrams for the Aqueous Ternary System Containing Sodium, Sulfate, and Metaborate Ions at 288.15 and 308.15 K and 101.325 kPa

Chen

Cui

et al. 2019

J. Chem. Eng. Data

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“…Despite many studies on the crystallization of sodium sulfate over the last 150 years, the reason why it generates damage remains controversial. Sodium sulfate has two stable phases at room temperature, thenardite (an anhydride) and mirabilite (a decahydrate), as well as a metastable phase [35][36][37]. At low temperature, the solubility of sodium sulfate largely decreases so that the pore liquid in the stabilized soil reaches supersaturation, which is a necessary condition for the occurrence of crystallization pressure [38,39].…”

Section: Discussionmentioning

confidence: 99%

Investigation of Freeze‐Thaw Resistance of Stabilized Saline Soil

Zhou

Guan

Yan

2021

Advances in Civil Engineering

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In this paper, three freezing-thawing tests are designed to study the freeze-thaw resistance of stabilized sulfate type saline soil. The results show that different destructive modes and erosion extents are caused by different freeze-thaw conditions. The destructive effect from salt tends to be limited if there is no external water intrusion. When sufficient water is provided, ice expansion, dissolution recrystallization of salts, and ettringite growth during the thawing phase may take place. Soil water potential is used for analysis and explanation of the driving force and water migration in the stabilized soil. Pressure potential caused by the air sealed in the stabilized soil specimen leads to early water concentration in the outer parts of the specimen, and the surface layer is first eroded under the freeze-thaw cycles. A high percentage of soil stabilizer can improve the freeze-thaw resistance of stabilized soil, but a sufficiently long curing period plays a more important role. This study provides useful insights for improving the freeze-thaw resistance of solidified saline soil in road engineering.

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“…Flatt [19] and Wang et al [20] concluded that sodium sulfate crystals, sodium decahydrate crystals, and sodium sulfate solution coexist at 32.4°C and RH of 82.5%, as shown in Figure 1 [19,21]. When the temperature is greater than 32.4°C and the RH is less than the critical one, sodium sulfate decahydrate crystals lose water and become sodium sulfate crystals; vice versa, it absorbs water and becomes sodium sulfate solution.…”

Section: Introductionmentioning

confidence: 96%

Experimental Study on Influence of Vaporous Water on Salt Expansion of Sulfate Saline Soil

Peng

Wang

Fan

2019

Advances in Civil Engineering

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The harm of salt expansion of saline soil in arid areas has always been a major problem to be solved urgently. According to the conversion rule between sodium sulfate and sodium sulfate decahydrate, sodium sulfate decahydrate crystals can be precipitated from sodium sulfate solution by cooling. Besides, when the relative humidity (RH) exceeds the critical relative humidity (CRH), sodium sulfate decahydrate can be formed by the combination of sodium sulfate and vaporous water, resulting in the salt volume expansion. However, at present, in the salt expansion mechanism of sulfate saline soil, only the influence of liquid water is considered while vaporous water is not involved. To study the effects of temperature, salinity, and ARH on salt expansion, the salt expansion test of dry sulfate saline soil under the action of vaporous water was conducted, and its composition was analyzed by X-ray diffraction (XRD) technology. Experimental results showed that sodium sulfate decahydrate crystals were produced in the sulfate saline soil if the relative humidity (RH) of pore gas exceeded the critical one so that salt expansion occurred. Salt expansion and salt expansion rate of sulfate saline soil increased with the increase of RH and salinity but decreased with the increase of temperature. Therefore, the new salt expansion mechanism of sulfate saline soil under vaporous water is verified. The experimental results further perfected the original salt expansion mechanism of sulfate saline soil under the action of liquid water and guided the study of new treatment methods of sulfate saline soil.

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Acquisition and evaluation of thermodynamic data for mirabilite-thenardite equilibria at 0.1 MPa

Cited by 9 publications

References 30 publications

Phase Equilibria and Phase Diagrams for the Aqueous Ternary System Containing Sodium, Sulfate, and Metaborate Ions at 288.15 and 308.15 K and 101.325 kPa

Phase Equilibria and Phase Diagrams for the Aqueous Ternary System Containing Sodium, Sulfate, and Metaborate Ions at 288.15 and 308.15 K and 101.325 kPa

Investigation of Freeze‐Thaw Resistance of Stabilized Saline Soil

Experimental Study on Influence of Vaporous Water on Salt Expansion of Sulfate Saline Soil

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