Raw cement is a mixture of lime-based raw materials, clay-based raw materials, and a small amount of calibration raw materials (sometimes mineralizers, seed crystals, etc.), with carbon added during cement production. shaft furnace) in proportion to be ground to a certain fineness. Depending on the cement production method, raw flour can be divided into raw flour slurry, raw flour powder, raw flour granules and raw flour blocks. They are suitable for wet, dry, semi-dry and semi-wet production requirements. No matter what kind of raw flour, the chemical composition is required to be stable, and the fineness and moisture must be guaranteed to meet the requirements of different production methods, so as not to affect the kiln calcination and clinker quality.
| Material | Loss | SiO2 | Al2O3 | Fe2O3 | CaO | MgO | R2O | others | Sum |
|---|---|---|---|---|---|---|---|---|---|
| Limestone | 43.56 | 2.45 | 0.36 | 0.21 | 50.48 | 2.13 | 0.24 | 0.57 | 100.00 |
| Fly ash | 1.45 | 53.44 | 26.87 | 6.73 | 7.23 | 1.36 | 1.26 | 1.66 | 100.00 |
| Sandstone | 0.69 | 90.68 | 1.47 | 1.20 | 2.15 | 0.12 | 0.30 | 3.39 | 100.00 |
| Iron powder | 6.00 | 18.25 | 2.36 | 62.78 | 2.54 | 1.98 | 1.33 | 4.76 | 100.00 |
| Coal ash | - | 53.09 | 26.60 | 5.12 | 7.15 | 1.78 | 1.23 | 5.03 | 100.00 |
| Fineness | R0.08＜14% |
|---|---|
| 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.
