Effect of Sodium Citrate on the Hydration Capacity of Hemihydrate Calcium Sulfate Whiskers

Wang, Yu Bin; Yu, Le; Wang, Hua; He, Ting

doi:10.4028/www.scientific.net/amm.584-586.1618

Cited by 3 publications

(7 citation statements)

References 6 publications

(4 reference statements)

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“…The vibration frequencies for sodium citrate are shown in Table 3. All FTIR data was interpreted using corresponding literature data [17,[22][23][24][25][26].…”

Section: Ftir Datamentioning

confidence: 99%

“…The vibration frequencies for sodium citrate are shown in Table 3. All FTIR data was interpreted using corresponding literature data [17,[22][23][24][25][26]. Processes preventing the Al surface from reacting with water by a protective coating formed on the particle surface typically involve precipitation and adsorption.…”

Section: Ftir Datamentioning

confidence: 99%

“…The vibration frequencies for sodium citrate are shown in Table 3. All FTIR data was interpreted using corresponding literature data [17,[22][23][24][25][26]. The FTIR spectrum of pure sodium citrate showed all expected vibration bands.…”

Section: Ftir Datamentioning

confidence: 99%

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Hydrogen Inhibition as Explosion Prevention in Wet Metal Dust Removal Systems

et al. 2022

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Hydrogen energy attracts an amount of attention as an environmentally friendly and sustainable energy source. However, hydrogen is also flammable. Hydrogen fires and explosions might occur in wet-dust-removal systems if accumulated aluminum dust reacts with water. Hydrogen inhibition is a safe method to address these issues. For this purpose, we used sodium citrate, a renewable and nontoxic raw material to inhibit H2 formation. Specifically, hydrogen inhibition experiments with sodium citrate were carried out using custom-built equipment developed by our research group. When the concentration of sodium citrate solution was in the range of 0.4–4.0 g/L, a protective coating was formed on the surface of the Al particles, which prevented them from contacting with water. The inhibitory effect was achieved when the concentration of sodium citrate was in a certain range, and too much or too little addition may reduce the inhibitory effect. In this paper, we also discuss the economic aspects of H2 inhibition with this method because it offers excellent safety advantages and could be incorporated on a large scale. Such an intrinsic safety design of H2 inhibition to control explosions in wet-dust-removal systems could be applied to ensure the safety of other systems, such as nuclear reactors.

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“…The vibration frequencies for sodium citrate are shown in Table 3. All FTIR data was interpreted using corresponding literature data [17,[22][23][24][25][26].…”

Section: Ftir Datamentioning

confidence: 99%

Section: Ftir Datamentioning

confidence: 99%

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Hydrogen Inhibition as Explosion Prevention in Wet Metal Dust Removal Systems

et al. 2022

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“…13 The critical supersaturation for the growth of BaSO 4 and SrSO 4 crystals was 7.0 and 2.3, respectively, above which two-dimensional nucleation and growth occurred on the (001) plane of the two crystals. [15][16][17][18] It was reported that the conversion of α-CaSO 4 Ĵ0.5H 2 O to CaSO 4 Ĵ2H 2 O in water (20°C) was carried out via a dissolution-precipitation route because CaSO 4 Ĵ2H 2 O was more thermodynamically stable than α-CaSO 4 Ĵ0.5H 2 O at room temperature, 16 while the hydrothermal conversion (120-150°C) of CaSO 4 Ĵ2H 2 O to α-CaSO 4 Ĵ0.5H 2 O occurred via dissolution-precipitation since α-CaSO 4 Ĵ0.5H 2 O was more thermodynamically stable than CaSO 4 Ĵ2H 2 O at elevated temperature. 14 Some work has been carried out to reveal the formation mechanisms and kinetics in an aqueous system containing α-CaSO 4 Ĵ0.5H 2 O and/or CaSO 4 Ĵ2H 2 O.…”

Section: Introductionmentioning

confidence: 99%

“…14 Some work has been carried out to reveal the formation mechanisms and kinetics in an aqueous system containing α-CaSO 4 Ĵ0.5H 2 O and/or CaSO 4 Ĵ2H 2 O. [15][16][17][18] 8,19,20 The heterogeneous nucleation of CaSO 4 Ĵ2H 2 O in the presence of sand substrates was a second-order precipitation process, 21 and the subsequent crystallization of CaSO 4 Ĵ2H 2 O in the temperature range of 15-45 °C was controlled by the surface growth with an activation energy of 15.0 kcal mol −1 . 22 Up to now little work has been done concerning the influence of supersaturation on the hydrothermal formation of α-CaSO 4 Ĵ0.5H 2 O from CaSO 4 Ĵ2H 2 O, which limited the controllable synthesis and optimization of α-CaSO 4 Ĵ0.5H 2 O whiskers.…”

Section: Introductionmentioning

confidence: 99%

Supersaturation-induced hydrothermal formation of α-CaSO₄·0.5H₂O whiskers

et al. 2015

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The supersaturation-induced hydrothermal formation of α-CaSO 4 Ĵ0.5H 2 O whiskers from the CaSO 4 Ĵ2H 2 O precursor at 115-150°C was investigated in this paper. The experimental results indicated that the conversion processes were carried out via dissolution-precipitation and homogeneous nucleation routes and connected with the critical supersaturation (abbreviated as S crit , ln S crit = aĲγ/T) 3/2 ) of the system. In the temperature range of 115-150°C, α-CaSO 4 Ĵ0.5H 2 O whiskers with a length of 200-500 μm and a diameter of 0.1-0.5 μm formed quickly within 2.0-5.0 minutes once the supersaturation (abbreviated as S) reached S crit .The supersaturation-induced formation of α-CaSO 4 Ĵ0.5H 2 O is well consistent with the first-order reaction model, and the corresponding activation energy (E a ) and pre-exponential factor (A 0 ) were 161.7 kJ mol −1 and 2.601 × 10 21 h −1 , respectively.

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Inhibition of Poly(ethylenediaminetetraacetic acid-diethanolamine) on Deposition of Calcium Sulfate Crystal in Simulated Industrial Water

et al. 2020

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Calcium sulfate scale is a typical deposit on the equipment pieces or pipes of an industrial water system. Scale inhibitors could obviously reduce the precipitation of calcium sulfate crystal. The development and research of late-model environmentally friendly polymer inhibitors are often urgent problems to be addressed. A water-soluble poly(ethylenediaminetetraacetic acid-diethanolamine) (PEDTA-DEA) was successfully synthesized by thermal polycondensation of ethylenediaminetetraacetic acid (EDTA) with diethanolamine (DEA). The polymer product was characterized by Fourier infrared spectrum (FTIR) and the molecular weight was measured by gel chromatography, which confirms the polymerization of the two monomers. The inhibition effect of the polymer against calcium sulfate deposition was studied by static scale inhibition tests. When the Ca2+ concentration is 3000 mg/L, and the dosage of the polymer inhibitor is 10 mg/L, the inhibition effect exceeds 90%. The results show that PEDTA-DEA can inhibit the precipitation of calcium sulfate and reduce the deposition of calcium sulfate scale. The precipitate of calcium sulfate collected from the static scale inhibition test solution was analyzed by FTIR, scanning electron microscope (SEM) and X-ray diffraction (XRD). The results revealed that the addition of the polymer significantly changes the calcium sulfate crystal’s growth shape. Therefore, PEDTA-DEA is a potential calcium sulfate precipitation inhibitor for the industrial water system.

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Effect of Sodium Citrate on the Hydration Capacity of Hemihydrate Calcium Sulfate Whiskers

Cited by 3 publications

References 6 publications

Hydrogen Inhibition as Explosion Prevention in Wet Metal Dust Removal Systems

Hydrogen Inhibition as Explosion Prevention in Wet Metal Dust Removal Systems

Supersaturation-induced hydrothermal formation of α-CaSO₄·0.5H₂O whiskers

Inhibition of Poly(ethylenediaminetetraacetic acid-diethanolamine) on Deposition of Calcium Sulfate Crystal in Simulated Industrial Water

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Effect of Sodium Citrate on the Hydration Capacity of Hemihydrate Calcium Sulfate Whiskers

Cited by 3 publications

References 6 publications

Hydrogen Inhibition as Explosion Prevention in Wet Metal Dust Removal Systems

Hydrogen Inhibition as Explosion Prevention in Wet Metal Dust Removal Systems

Supersaturation-induced hydrothermal formation of α-CaSO4·0.5H2O whiskers

Inhibition of Poly(ethylenediaminetetraacetic acid-diethanolamine) on Deposition of Calcium Sulfate Crystal in Simulated Industrial Water

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Product

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Supersaturation-induced hydrothermal formation of α-CaSO₄·0.5H₂O whiskers