There are many methods for preparing spherical nano-magnesium oxide powder, among which the most commonly used ones are as follows:
Hydrothermal method: This method is to hydrolyze a soluble magnesium oxide salt solution in a high temperature and high pressure environment to prepare nano magnesium oxide particles. The nano-magnesium oxide particles prepared by the hydrothermal method have uniform particle size, regular shape, and good stability and dispersion.
Sol-gel method: This method is to hydrolyze and condensate a soluble magnesium oxide salt solution in an organic solvent to prepare nano-magnesium oxide gel. After the gel is calcined, spherical nanometer magnesium oxide powder can be obtained. The particle size of nano-magnesium oxide particles prepared by the sol-gel method can be controlled, and the shape can be spherical, polyhedral, etc.
Emulsion method: This method is to mix magnesium oxide salt solution and emulsifier to form an emulsion. After the emulsion is subjected to hydrolysis reaction, spherical nanometer magnesium oxide powder can be obtained. The nano-magnesium oxide particles prepared by the emulsion method have uniform particle sizes and regular shapes.
The following are the specific steps for the preparation of spherical nano magnesium oxide powder:
Hydrothermal
Weigh a certain amount of soluble magnesium oxide salt, dissolve it in an appropriate amount of water, and prepare a solution.
Place the solution in a high-temperature autoclave, heat it to a certain temperature, and keep it warm for a certain period of time.
After the reaction is completed, the solution is cooled, the precipitate is separated, washed with water, and then dried.
sol-gel method
Weigh a certain amount of soluble magnesium oxide salt, dissolve it in an appropriate amount of water, and prepare a solution.
Add the solution to the organic solvent and stir evenly.
Add a certain amount of catalyst and continue stirring.
After the reaction is completed, the sol is allowed to stand and a gel forms.
The gel is calcined to obtain spherical nanometer magnesium oxide powder.
emulsion method
Weigh a certain amount of soluble magnesium oxide salt, dissolve it in an appropriate amount of water, and prepare a solution.
Add emulsifier and mix well.
Emulsify the solution.
The emulsion is subjected to a hydrolysis reaction.
After the reaction is completed, the emulsion is separated to obtain spherical nanometer magnesium oxide powder.
Spherical nano-magnesium oxide powder has good application prospects and can be used in advanced ceramic materials, electrical insulation materials, cosmetics, paints, rubber fillers, acid gas adsorbents, catalyst carriers and other fields.