Gypsum is a monoclinic mineral whose main component is calcium sulfate (CaSO4). Gypsum can generally refer to two minerals, raw gypsum and anhydrite. Raw gypsum, also known as dihydrate gypsum, water gypsum or soft gypsum, is usually dense or fibrous and has a Mohs hardness of 2. Anhydrite is anhydrous calcium sulfate, usually dense block or granular, white, off-white, vitreous, and Mohs hardness is 3 to 3.5.
Stucco gypsum obtained by calcining gypsum to 170℃ is used for smearing ceilings, wooden boards, etc.; gypsum can be used as cement and cementitious material, and used as filler in industrial production such as plastics, rubber, coatings, asphalt, linoleum, etc.; It can be used as coagulation and expansion agent, anti-cracking agent, main raw material of self-leveling mortar, etc.
Gypsum can be used to produce sulfuric acid, and light cement can be produced; ammonium sulfate can be produced, and light calcium carbonate can be produced.
Gypsum can be used to improve the soil and adjust the pH; It can be used as a mineral fertilizer composed of calcium and sulfur in the cultivation of edible mushrooms; It can be used as a compound mineral feed additive for poultry and livestock.
With the continuous increase of environmental protection efforts, the role of gypsum in thermal power plants has become increasingly prominent. In the desulfurization process, choosing a good desulfurizer is the key to absorbing sulfur dioxide. Limestone can be used as a high-efficiency desulfurizer. The smaller the particle size, the more conducive to the absorption of sulfur dioxide, the more efficient and rapid the desulfurization and purification of the flue gas after combustion can be carried out.
| CaO | SO3 | H2O+ |
|---|---|---|
| 32.5% | 46.6% | 20.9% |
| Fineness | Fine Powder(100-400 mesh) | Ultrafine Powder(600-2000 mesh) |
|---|---|---|
| Model | Vertical mill or Raymond mill | ultrafine roller mill or Vertical ultrafine mill |
The material is crushed by the crusher to the fineness that can enter the mill(15mm-50mm).
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.
Through classification, the coarse powder will return to main mill to grind again.
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.
