Solubility of CaSO<sub>4</sub>Phases in Aqueous HCl + CaCl<sub>2</sub>Solutions from 283 K to 353 K

Li, Zhibao; Demopoulos, George P.

doi:10.1021/je050217e

Cited by 86 publications

(57 citation statements)

References 19 publications

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“…It can be clearly seen that there is an important influence of the presence of Cr 3+ and Fe 3+ ions, HCl concentration, and temperature on the solubility of calcium sulfate dihydrate. At this point, it should be indicated that the equilibrated solid phases are stable in the dihydrate form of calcium sulfate in a solution of low HCl concentration (0–5 M) at a temperature below 333 K . However, a transformation from dihydrate to anhydrate can occur based on the temperature and HCl concentration of the solution , .…”

Section: Resultsmentioning

confidence: 99%

“…At this point, it should be indicated that the equilibrated solid phases are stable in the dihydrate form of calcium sulfate in a solution of low HCl concentration (0–5 M) at a temperature below 333 K . However, a transformation from dihydrate to anhydrate can occur based on the temperature and HCl concentration of the solution , . In literature, the transformation from dihydrate to hemihydrate or anhydrate was also investigated in HCl solutions in the presence of CaCl 2 over a broad temperature range .…”

Section: Resultsmentioning

confidence: 99%

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Thermodynamic Models and Central Composite Design for Calcium Sulfate Dihydrate Solubility

2020

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The solubility of calcium sulfate dihydrate (gypsum) was measured in HCl solutions in the presence of Cr 3+ and Fe 3+ ions at various temperatures. The results indicate that the solubility of gypsum is fairly dependent on the concentrations of HCl and impurities, i.e., Cr 3+ and Fe 3+ ions. The experimental data were analyzed by applying the Buchowski-Kiazczak (lh) model and the modified Apelblat model. Some thermodynamic parameters, such as the standard molar dissolution enthalpy, the standard molar Gibbs energy, and the entropy of solutions, were calculated by Van't Hoff analysis and Gibbs equation. The influences of the concentrations of both HCl and impurities, i.e., Cr 3+ and Fe 3+ ions, and temperature on the gypsum solubility were examined by applying the central composite design.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Thermodynamic Models and Central Composite Design for Calcium Sulfate Dihydrate Solubility

2020

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“…The solubility of the different CaSO 4 hydrates was studied by several researchers [25,[28][29][30][31][32][33]. The data are summarized in Figure 10.…”

Section: Solubility Of Caso 4 Hydrates In Watermentioning

confidence: 99%

“…CaSO 4 )[25,26]. While dihydrate is recognized as the stable form at temperatures lower than 40 • C and anhydrate at higher temperatures, hemihydrate is a metastable form and can coexist at temperatures around 90 to 130 • C[27][28][29].…”

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confidence: 99%

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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“…Particularly, carbide slag can be used to prepare calcium sulfate [9]. Before preparing calcium sulfate whiskers(CSW), researchers did a lot of studies on setting stages for the preparation of CSW [10][11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Preparation of calcium sulfate whiskers by carbide slag through hydrothermal method

Wang

Yuan³

et al. 2014

Crystal Research and Technology

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In this work, a series of calcium sulfate whiskers were prepared successfully using carbide slag as raw material through hydrothermal method. The prepared gypsum observed is hemihydrate calcium sulfate and the formation of the calcium sulfate whiskers are influenced by preparation parameters. The optimal preparation conditions are as follows: seriflux concentration, 4 %; hydrothermal reaction time, 10 h; hydrothermal reaction temperature, 130°C; seriflux pH, 7; calcium‐magnesium ratio, 12 : 1. Some nanowires appear when seriflux pH is very low (e.g. 1). The length‐diameter ratio of the whiskers is about 60‐80.

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Solubility of CaSO₄Phases in Aqueous HCl + CaCl₂Solutions from 283 K to 353 K

Cited by 86 publications

References 19 publications

Thermodynamic Models and Central Composite Design for Calcium Sulfate Dihydrate Solubility

Thermodynamic Models and Central Composite Design for Calcium Sulfate Dihydrate Solubility

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

Preparation of calcium sulfate whiskers by carbide slag through hydrothermal method

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Solubility of CaSO4Phases in Aqueous HCl + CaCl2Solutions from 283 K to 353 K

Cited by 86 publications

References 19 publications

Thermodynamic Models and Central Composite Design for Calcium Sulfate Dihydrate Solubility

Thermodynamic Models and Central Composite Design for Calcium Sulfate Dihydrate Solubility

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

Preparation of calcium sulfate whiskers by carbide slag through hydrothermal method

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Solubility of CaSO₄Phases in Aqueous HCl + CaCl₂Solutions from 283 K to 353 K