Influence of pH on the Crystal Size Distribution of Mg(OH)₂ Prepared by the Hydration of MgO

Abstract

The effect of pH and temperature of aqueous solution on hydration of MgO in a batch laboratory reactor was investigated. The experiments were carried out at the temperatures of 120 and I40 "C, pH of cool solution was changed from 10 to 13. It was found that even a small amount of added base substance influences remarkably the size of Mg(OH), crystals. Increasing of pH of aqueous environment causes the decrease of the size of crystals. The increase of the temperature increase dimensions of crystals. This effect is more important at higher alkalinity of the solution.

Synthesis and characterization of superfine magnesium hydroxide with monodispersity

“…Until now, superfine MH powders can be obtained via different methods or different preparation conditions, i.e. sol-gel [10][11][12][13], hydrothermal modification [6], solvothermal modification [14], hydration method of magnesium oxide [15,16] and microwave-assisted synthesis techniques [7]. However, these methods often require longer synthesis time, complicated equipment and process condition, which make them inconvenient and economically unacceptable for halogen-free flame-retardant polymeric materials.…”

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

“…A similar procedure was adopted by Yan et al, who got superfine arrays of magnesium hydroxide nanoparticles synthesized via the direct precipitation method at room temperature through the addition of a cationic surfactant, cetyl trimethyl ammonium bromide (CTAB) [23]. On the other hand, magnesium hydroxide nanocrystals can also be obtained by hydration of magnesium oxide, MgO [24,25]. Qian et al obtained platelet-shaped particles using the hydrating method of MgO, made from the decomposition of magnesite [26].…”

Morphological study of magnesium hydroxide nanoparticles precipitated in dilute aqueous solution

“…Magnesium hydroxide can be obtained by several methods [17,21,22], i.e. hydration of magnesium oxide MgO, [22,23], precipitation of a magnesium salt with an alkaline solution [24][25][26][27], electrolysis of an aqueous magnesium salt solution.…”

“…hydration of magnesium oxide MgO, [22,23], precipitation of a magnesium salt with an alkaline solution [24][25][26][27], electrolysis of an aqueous magnesium salt solution. Industrial production of magnesium hydroxide is mainly driven by the two first methods [28][29][30].…”