Phosphogypsum mainly has two kinds of gray-black and gray-white, the particle diameter is generally 5 ~ 50μm, and the crystal water content is 20% ~ 25%. Phosphogypsum is a solid waste produced in the wet phosphoric acid process, and its component is mainly calcium sulfate dihydrate. The composition of phosphogypsum is relatively complex. In addition to calcium sulfate, there are also incompletely decomposed phosphate rock, residual phosphoric acid, fluoride, acid insoluble matter, organic matter, etc. Among them, the existence of fluorine and organic matter has the greatest impact on the resource utilization of phosphogypsum. The random discharge and accumulation of phosphogypsum has seriously damaged the ecological environment, not only polluting groundwater resources, but also causing waste of land resources.
Widely used in the field of building materials, large consumptive amount of phosphogypsum and its mature technology application route is carried out by grinding mill. The fine powder of gypsum plaster could be used as building materials in the manufacture of new products including gypsum instead of natural gypsum cement retarder production, refining building gypsum powder, production of plaster board, gypsum block and the like.
In industrial field, phosphogypsum used to produce sulfuric acid and cement ammonium sulfate, potassium sulfateand and other products through different processing methods, give full play to its special value.
phosphogypsum rendered acidic, is very rich in sulfur, calcium, magnesium and other trace elements, in addition of widely used for construction, road and other purposes, but also for improvement of saline-alkali soil conditioner, played an important role in alleviate desertification. And moreover, phosphogypsum can also be prepared as a long-acting fertilizer and other fertilizer raw materials.
| CaO | MgO | SO2 | Al2O3 | Fe2O3 | SiO2 | P2O5 | F |
|---|---|---|---|---|---|---|---|
| 32.14% | 0.4% | 43.38% | 0.18% | 0.04% | 9.45% | 1.18% | 0.80% |
| Fineness | above 80 mesh |
|---|---|
| Model | Vertical 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.
