The surface coating treatment of ultrafine powder is a very useful technology, which can improve the flow performance of the powder, reduce dust flying, improve stability and moisture resistance, and enhance the solubility of the powder. The commonly used surface coating treatment methods for ultrafine powders include the following:

Wet surface treatment: The coating material is added in liquid form to the powder and dried to form a thin film. The coating agent can be polymer, starch, polyacrylic acid or stearic acid, etc.

Dry surface treatment: The powder and coating material are mixed separately in a mechanical dryer, and the coating material adheres to the surface of the powder through airflow to form a thin film. The coating agent can be silicic acid, silica, calcium carbonate, talc powder, etc.

Ion exchange: Using substances such as surfactants or ion exchange resins to prepare ion dense liquids into solids, fixing ions on the surface of the powder through electrostatic adsorption and other methods, and coating the solid powder.

Air gel method: prepare ink liquid by spray drying, and prepare liquid phase containing chitosan, gelatin, etc. by gel, so that the liquid phase condenses into small particles, and then mix them with micro powder. At this time, the solvent on the surface of the small particles volatilizes, forming a glue layer covering the surface of the micro powder for surface coating treatment.

The above are some common surface coating treatment methods for ultrafine powders. These methods can be adjusted and modified according to the specific powder requirements.