Synthesis of Magnesium Hydroxide Using Post‐Reaction Filtrate as Ammonia Carrier and Morphology Analysis

Shi, Xiaoyan; Chen, Hang; Sun, Yuzhu; Song, Xingfu; Yu, Jianguo

doi:10.1002/crat.202200014

Cited by 2 publications

(6 citation statements)

References 44 publications

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“…In the ordinary synthesis process, lamellar crystals generally do not aggregate and grow in the [0 0 1] direction, but the crystals would aggregate in the (1 0 0), (1 1 0), (1 0 2), and (1 0 1) directions to reduce the overall energy, finally growing into flower-shape crystals. [32] In addition, this also explains the reason for MH crystals after hydrothermal treatment exhibit lamellar morphology with good dispersion.…”

Section: Structure and Surface Energy Of Crystal Planesmentioning

confidence: 93%

“…The precursors MH with different morphologies were prepared under different experimental conditions in the previous work. [32] The small round flaky precursors were synthesized with 4 mol L −1 MgCl 2 solution and 8 mol L −1 NaOH solution at 298 K with the stirring rate of 300 rpm. Specifically, 50 mL NaOH solution was added into a jacketed reactor containing 50 mL MgCl 2 solution at the feed rate of 25 mL min −1 , then the suspension was filtered immediately after the reaction.…”

Section: Experimental Methodsmentioning

confidence: 99%

“…The sample measured by XRD was irregular flaky MH prepared under the optimal conditions from the previous work. [32] Thus, these crystal planes, including (0 0 1), (1 0 0), (1 0 1), (1 1 0), and (1 0 2) planes, were selected for surface study.…”

Section: Surface Model Using First Principalsmentioning

confidence: 99%

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Simulation of the Influence Mechanism of Hydrothermal Modification on Magnesium Hydroxide

Shi

Chen

Sun

et al. 2023

Cryst. Res. Technol.

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To overcome the drawbacks of strong polarity and easy agglomeration of ordinary magnesium hydroxide (MH), hydrothermal modification is customary applied to achieve its excellent dispersion as well as controllable morphology and particle size. In this paper, the influence mechanism of hydrothermal modification is elaborated from microstructure of MH. Structures and surface energy of crystal planes, affinity of water molecules for crystal planes, and crystal growth process are calculated by Materials Studio software. Furthermore, molecular dynamics simulations about solid-liquid interface model of MH and 1 mol L −1 NaOH solution at different temperatures are performed based on the theory of modified attachment energy model. The results indicate that (0 0 1) plane with the smallest surface energy has the strongest thermodynamic stability, equipping modified crystals with lamellar morphology and excellent dispersion. (0 0 1) plane cannot be dissolved easily because of the smallest affinity of water molecules. The magnesium atoms and hydroxyl groups on (1 0 1) plane dissolved are absorbed on (0 0 1) plane, resulting in the large value of I 001 /I 101 in the X-ray diffraction pattern. The relative growth rate of (1 0 1) plane R 101 decreases with the increasing temperature, explaining why crystals become thicker with raising temperature.

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Section: Structure and Surface Energy Of Crystal Planesmentioning

confidence: 93%

Section: Experimental Methodsmentioning

confidence: 99%

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Simulation of the Influence Mechanism of Hydrothermal Modification on Magnesium Hydroxide

Shi

Chen

Sun

et al. 2023

Cryst. Res. Technol.

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“…In the previous work, the idea crystal habit of MH could be predicted by Bravais–Friedel Donnay–Harker and Growth Morphology methods in the morphology module, which showed that the morphology of the MH crystal was regular hexagonal plate. As shown in Figure , the (0 0 1) plane determines the diameter of the plate, and the (1 1 0) plane mainly determines the thickness of the plate.…”

Section: Methodsmentioning

confidence: 99%

“…The MH precursor was prepared under optimal synthesis conditions in the previous work. 23 2.1.2. Experimental Procedures.…”

Section: Experimental Methods 211 Materials Naoh Andmentioning

confidence: 99%

Effects of Flotation Reagents on the Morphology of Magnesium Hydroxide: Experimental and Simulation Study

Shi

Chen

Sun

et al. 2023

Ind. Eng. Chem. Res.

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The flotation process to extract potassium salt from carnallite ores could produce the MgCl 2 mother liquor with flotation reagents�octadecyl amine hydrochloride (ODA) and dodecyl morpholine (DMP). The organic impurities would further affect MgCl 2 resource-integrated utilization for preparing magnesium hydroxide (MH). In this study, the effects of flotation reagents with different concentrations on the morphology of MH were investigated at a hydrothermal temperature of 200 °C for 6 h with the hydrothermal medium of a 4 mol/L NaOH solution. It was observed that the average thickness of MH crystal plates increased and the morphology of crystals changed from regular hexagonal plates to irregular polygonal plates with the increase of ODA and DMP concentrations. Molecular dynamics (MD) simulation was applied to further explain the effect mechanism. The results indicated that ODA and DMP molecules were more likely to be adsorbed on the (1 1 0) plane in contrast to the (0 0 1) plane due to the larger absolute values of adsorption energy on the (1 1 0) plane. The long carbon chains far away from the (1 1 0) plane would form steric hindrance to affect the growth rate of MH crystals in the [1 1 0] direction.

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Synthesis of Magnesium Hydroxide Using Post‐Reaction Filtrate as Ammonia Carrier and Morphology Analysis

Cited by 2 publications

References 44 publications

Simulation of the Influence Mechanism of Hydrothermal Modification on Magnesium Hydroxide

Simulation of the Influence Mechanism of Hydrothermal Modification on Magnesium Hydroxide

Effects of Flotation Reagents on the Morphology of Magnesium Hydroxide: Experimental and Simulation Study

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