Dissolution kinetics of magnesium hydroxide for CO2 separation from coal-fired power plants

Bharadwaj, Hari Krishna; Lee, Joo-Youp; Li, Xin; Liu, Zhouyang; Keener, Tim C.

doi:10.1016/j.jhazmat.2013.02.009

Cited by 30 publications

(15 citation statements)

References 22 publications

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“…The reason why the nanoparticles have multiple applications is that crystalline Mg(OH) 2 offers several great advantages, such as a good thermal stability, good fire retardant properties, a low toxicity and a low cost [5,6]. In addition, the Mg(OH) 2 nanoparticles may be effective antibacterial agents [7,8].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and morpho-structural characterization of nanostructured magnesium hydroxide obtained by a hydrothermal method

Sierra-Fernández

Gomez-Villalba

Milošević

et al. 2014

Ceramics International

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Section: Introductionmentioning

confidence: 99%

Synthesis and morpho-structural characterization of nanostructured magnesium hydroxide obtained by a hydrothermal method

Sierra-Fernández

Gomez-Villalba

Milošević

et al. 2014

Ceramics International

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“…When 20 g MgO was hydrated in 100 mL of 18.4 g L –1 NH 4 AC solution, the pH reached about 10.5. In such an alkaline environment, [NH 3 •H 2 O] calculated according to the hydrolysis equilibrium (Eqn (5)) is 4.2 mol L –1 , which is much higher than its equilibrium concentration (7.11 × 10 −4 mol L –1 ). Therefore, NH 4 + will escape from the solution as NH 3 gas.…”

Section: Resultsmentioning

confidence: 90%

“…[1][2][3] In most of the above applications, the dissolving activity of MH is closely related to its application effect. [4][5][6] The dissolution of MH is controlled by many different factors such as pH, temperature and mixing strength. 7 However, the optimization of these process conditions is restricted by economy, environment and safety in practical applications.…”

Section: Introductionmentioning

confidence: 99%

“…As an environmentally friendly inorganic environmental engineering material, magnesium hydroxide (MH) has been widely used in industrial wastewater treatment, flue gas desulfurization, and CO 2 capture and storage 1–3 . In most of the above applications, the dissolving activity of MH is closely related to its application effect 4–6 . The dissolution of MH is controlled by many different factors such as pH, temperature and mixing strength 7 .…”

Section: Introductionmentioning

confidence: 99%

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Enhanced dissolution rate of magnesium hydroxide via magnesia/ammonium acetate hydration system: statistical optimization and possible mechanism

Tang

Chuang

et al. 2020

J of Chemical Tech & Biotech

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BACKGROUND The dissolubility of magnesium hydroxide is often the main factor limiting its application effect in the environmental field, and the dissolution rate of magnesium hydroxide during its synthesis is also worthy of attention. In this paper, response surface methodology was used to synthesize magnesium hydroxide with different dissolution rates through a magnesium oxide/ammonium acetate hydration system, and the possible formation mechanism as well as dissolution performance is discussed. RESULTS Compared with the hydration temperature and time, the concentration of ammonium acetate has a more significant effect on the dissolution rate of hydrated magnesium hydroxide. A maximum dissolution rate of 43.8 ± 0.3 mmol min−1 mol−1 magnesium hydroxide could be obtained when the working factors were ammonium acetate concentration 15 g L–1, hydration temperature 75.5 °C and time 112 min. CONCLUSION The correlation study between structural characterization and the dissolution test shows that the complexation and replacement of acetate, in situ generation and release of ammonia appear to have some critical effects on magnesium hydroxide crystallization behaviour and induce the formation of thin, curved and defective structures. Crystals with such structures have been reported to have a higher dissolution activity. The results of this study provide an indication for screening hydration synthetic agents of high‐dissolution‐rate magnesium hydroxide. © 2020 Society of Chemical Industry (SCI)

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“…From Table 1, the values of rate constant at different temperatures increased with increase in temperature. At a temperature of 303 K, the rate constant was 0.000261 min −1 , and then it increased to 0.000742 min −1 at a temperature of 348 K. There was a significantly huge gap between the values obtained at 333 and 348 K. This is because high temperatures affect the kinetic characteristics of the leaching process and this leads to high reactivity (Bharadwaj et al, 2013).…”

Section: Xrd Analysismentioning

confidence: 98%

Leaching kinetics of bottom ash waste as a source of calcium ions

Koech

Everson

Neomagus

et al. 2015

Journal of the Air & Waste Management Association

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Bottom ash is a waste material from coal-fired power plants, and it is known to contain elements that are potentially toxic at high concentration levels when disposed in landfills. This study investigates the use of bottom ash as a partial substitute sorbent for wet flue gas desulfurization (FGD) processes by focusing on its leaching kinetics in adipic acid. This was studied basing on the shrinking core model that was applied to the experimental data obtained by the authors presented at the International Conference on Industrial, Manufacturing, Automation and Mechanical Engineering, Johannesburg, South Africa, November 27-28, 2013) on dissolution of bottom ash. The leaching rate constant was obtained from different reaction variables, namely, temperature, pH, acid concentration, and solid-to-liquid ratio, that could affect the leaching process. The solid sample of bottom ash was characterized at different leaching periods using X-ray diffraction (XRD) and scanning electron microscopy (SEM). It was found that solid-to-liquid ratio had a significant effect on the leaching rate constant when compared with other variables. The leaching kinetics showed that diffusion through the product layer was the rate-controlling step during leaching, and the activation energy for the process was found to be 18.92 kJ/mol.Implications: The use of coal bottom ash waste as a sorbent substitute in wet flue gas desulfurization (FGD) has both economic and environmental advantages. This is because it is a waste from coal-fired thermal power plant and this study has proven that it can leach out a substantial amount of calcium ions for wet FGD process. This will abate anthropogenic pollution due to landfill disposal of bottom ash wastes and also reduce sulfur dioxide emissions.

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Dissolution kinetics of magnesium hydroxide for CO2 separation from coal-fired power plants

Cited by 30 publications

References 22 publications

Synthesis and morpho-structural characterization of nanostructured magnesium hydroxide obtained by a hydrothermal method

Synthesis and morpho-structural characterization of nanostructured magnesium hydroxide obtained by a hydrothermal method

Enhanced dissolution rate of magnesium hydroxide via magnesia/ammonium acetate hydration system: statistical optimization and possible mechanism

Leaching kinetics of bottom ash waste as a source of calcium ions

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