A gypsum grinding plant refers to a production facility that grinds gypsum raw materials into gypsum powder of different finenesses for various applications. Here is a detailed introduction:

Gypsum is a hydrate of calcium sulfate (CaSO4) with abundant reserves in China, ranking first in the world. It is widely used in industries and construction, such as cement retarders, building products, model making, medical and food additives, sulfuric acid production, paper filling, and paint filling.

Core Process Flow

The process in a modern gypsum grinding plant can be broken down into several key stages:

1.Raw Material Receiving & Pre-Crushing

2.Drying (Crucial for FGD Gypsum)

3.Grinding – The Heart of the Plant

Common Types of Grinding Mills

1.Hammer Mill

2.Ball Mill / Tube Mill

3.Raymond Mill (Vertical Roller Mill)

4.Vertical Roller Mill

Calcining (Optional but Common in Integrated Plants)

Many gypsum grinding plants are integrated with a calcining step. The fine ground gypsum (CaSO₄·2H₂O) is then heated to partially or fully remove its chemically bound water.

• Calcining Process: The ground powder is fed into a Calciner (like a kettle, rotary calciner, or flash calciner) and heated to 150-180°C.
• Chemical Reaction: CaSO₄·2H₂O + Heat → CaSO₄·½H₂O + 1½H₂O (Gypsum to Stucco/Bassanite)
• Product: The resulting product is Stucco or Plaster of Paris, which is the binding agent used to manufacture gypsum boards and plaster.

Classification & Storage

Classification: After grinding, the powder passes through a Classifier (often integrated into the mill, like a dynamic separator in a VRM). This device ensures that only particles of the desired fineness leave the mill. Coarse particles are rejected and sent back for further grinding.

Storage: The final, finely ground gypsum powder (land plaster or stucco) is stored in large silos, ready to be shipped to wallboard plants or bagged for other uses.

Main Equipment List

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