How Is Raw Gypsum Processed into Powder in a Production Line

 How Is Raw Gypsum Processed into Powder in a Production Line?

Introduction
Transforming raw gypsum into fine powder involves a series of coordinated mechanical and thermal operations. A well‑designed production line balances throughput, energy consumption, and product consistency. Hengshui Decheng Machinery & Equipment Co., Ltd. provides modular and custom‑engineered production lines to meet diverse gypsum powder demands.

1. Material Unloading and Feeding

• Receiving Hopper
  Gypsum rock is delivered by truck or rail and unloaded into a reinforced hopper. Magnetic separators or metal detectors can be installed at the inlet to remove tramp metal.

• Proportional Feeder
  A belt or apron feeder regulates the flow of raw gypsum into the crusher, preventing surges and facilitating continuous operation.

2. Primary Crushing

• Coarse Reduction
  A jaw crusher breaks large stones into smaller fragments (up to 40 mm). The crusher drive is chosen to accommodate variability in rock hardness and to reduce maintenance intervals.

• Secondary Crushing (if required)
  For hard or very large stones, an impact crusher may follow the jaw crusher to further reduce particle size before screening.

3. Intermediate Screening and Stockpiling

• Vibrating Screen Decks
  Two‑deck screens classify gypsum into suitable sizes for thermal pretreatment. Oversized pieces return to the crusher loop, while undersized material proceeds to the dryer or calciner.

• Stock Pile Hoppers
  Stockpiling provides buffer capacity between batch deliveries and continuous calcination, helping to stabilize feed rates.

4. Thermal Treatment: Drying and Calcining

• Rotary Dryer
  In regions where gypsum contains excess moisture, a rotary dryer lowers moisture to around 1–2% before calcination.

• Calciner Operation
  Dehydration to hemihydrate form occurs in a rotary or shaft calciner. Optimal retention time and temperature profiles ensure consistent conversion and reactive surface area.

5. Fine Grinding Circuit

• High‑Efficiency Mill
  A vertical roller mill combines grinding rollers and a dynamic separator in a single unit. This design reduces floor space and energy use.

• Air‑Solid Separation
  Integrated dynamic separator classifies particles, returning coarse grains for regrinding. The result is a narrow particle size distribution ideal for construction plasters and other applications.

6. Quality Control and Testing

• Online Analyzers
  Near‑infrared or laser diffraction sensors monitor moisture, particle size, and chemical composition in real time, enabling immediate adjustments.

• Laboratory Sampling
  Periodic sampling ensures refractory and gypsum purity, setting P.O.P. levels and adherence to industry standards.

7. Final Packaging and Loading

• Bagging Lines
  Multi‑lane packing machines fill and seal paper or plastic‑laminated bags.

• Bulk Loading Systems
  For large‑volume customers, dense‑phase pneumatic systems load powder into silo trailers with minimal dust emissions.

Conclusion
Efficient gypsum powder production relies on the seamless integration of feeding, crushing, thermal treatment, grinding, and packaging equipment. Hengshui Decheng Machinery & Equipment Co., Ltd. offers scalable production lines optimized for capacity, energy efficiency, and product uniformity, supporting your growth in plaster, building materials, and specialized gypsum markets.