What is Desulfuration Gypsum


Desulfurization gypsum, also known as flue gas desulfurization gypsum, sulfur gypsum or FGD gypsum, has the same main component as natural gypsum, calcium sulfate dihydrate CaSO4·2H2O, with a content of ≥93%. Desulfurized gypsum is a by-product of the FGD process, a technology that uses lime-limestone to recover sulfur dioxide from flue gas from burning coal or oil. The technology is to grind lime-limestone into powder through a desulfurized gypsum mill, and then configure it into a slurry, so that the SO2-containing flue gas after dust removal is passed through a slurry scrubber to remove SO2. The lime slurry reacts with SO2 to generate calcium sulfate and calcium sulfite, and calcium sulfite is converted into calcium sulfate by oxidation to obtain industrial by-product gypsum, called desulfurized gypsum, which is widely used in building materials and other industries. Its processing and utilization are of great significance. It not only effectively promotes the further development of the national environmental protection circular economy, but also greatly reduces the amount of gypsum mined and protects resources.

The use of desulfuration gypsum


1. It is widely used in many application fields such as construction, building materials, industrial molds and art models, chemical industry and agriculture, food processing and medicine and beauty. It is an important industrial raw material.

2. The gypsum industry is using desulfurized gypsum on a large scale, and the application technology is relatively mature.

3. In recent years, fly ash and FGD are also used and a small amount of lime is added to make "Bozaite" wet powdery material with pozzolanic reaction strength as a substitute for sand.

4. Substitute kaolin and calcite to produce paper filler and sizing material, and use it together with natural gypsum to produce gypsum board.


Desulfuration gypsum milling process


Desulfuration Gypsum Powder Making Equipment Selection Program

Finenessabove 200 mesh
ModelVertical mill or Raymond mill

Stage 1: Crushing of raw materials

The material is crushed by the crusher to the fineness that can enter the mill(15mm-50mm).

Stage 2: Grinding

The crushed small pieces of material are sent to the storage hopper through the elevator,and then sent to the grinding chamber of the mill evenly and quantitatively through the feeder for grinding.

Stage 3:Classification

Through classification, the coarse powder will return to main mill to grind again.

Stage 4:Collection of finished products

The powder that meets the fineness enters the dust collector through the pipeline with the air flow for separation and collection, and the collected finished powder is sent to the finished product silo by the conveying device through the discharge port, and then is packaged uniformly.


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