1. Role of Gypsum Powder in Construction

Gypsum powder is widely used in the building industry for making plaster, wall putty, drywall boards, decorative elements, and as a setting regulator in cement. Its fine texture and binding properties make it an essential material for modern construction.

2. Gypsum Powder Processing Technology

The production process generally involves several key steps:

• Crushing: Large gypsum rocks are broken down into smaller pieces.

• Grinding: The crushed material is fed into mills (Raymond mill, vertical mill, ball mill, etc.) to achieve the desired powder fineness.

• Calcination: The ground gypsum is heated in a calciner or rotary kiln at 150–180°C to remove part of the crystal water, producing hemihydrate gypsum (commonly known as plaster of Paris).

• Cooling and Storage: The calcined gypsum is cooled, screened, and stored for packaging.

Gypsum Powder Making Machine

3. Fineness Requirements for Building Applications

Common construction plaster: Typically requires a fineness of about 150–200 mesh.

High-quality decorative plaster: Often ground to 300–400 mesh to ensure smoothness and easy application.

Cement additive: The fineness usually aligns with cement standards (often around 80–100 microns), ensuring good blending and hydration control.

Gypsum Grinding Machine

4. Quality Considerations

Uniform fineness ensures better workability and surface smoothness.

Proper calcination prevents under-burned or over-burned particles, which can weaken setting properties.

Compliance with international standards (such as ISO and ASTM) is crucial for reliable performance in construction projects.