How large is the particle size

Magnesium hydroxide is a insoluble precipitate, and secondly, magnesium oxide is also insoluble in water. Therefore, under normal conditions, magnesium oxide cannot react with water to produce magnesium hydroxide.
However, according to the fitted kinetic equation, it can be obtained by hydrothermal method.
The best combination of magnesium oxide hydration at atmospheric pressure is 90 degrees Celsius for 4 hours
When the temperature reaches 200 degrees Celsius and the time reaches eight hours, hexagonal flake type magnesium hydroxide can be obtained.
The hydration of magnesium oxide is actually a process of magnesium oxide dissolution and magnesium hydroxide precipitation, wherein the dissolution of magnesium oxide is a control step. The solubility of magnesium oxide in magnesium chloride solution increases, promoting an increase in the degree of hydration.
However, not all magnesium oxide can easily react with water to form magnesium hydroxide. Only lightly burned magnesium oxide can react, while medium and heavy burned magnesium oxide cannot fully react.