Powder granulation technology, as one of the major branch of powder processing, with the requirement of environment protection and the improvement of production process automation, its importance becomes more and more obviously day by day. “Powder product granulated” is the inexorable trend of powder reprocessing technology all over the world.

Processing the powder product into the granules, the major purposes are as the below

3 aspects:
◆Reduce powder dust contamination, improve the working operation condition.
◆Meet the requirements of production process, such as porosity and specific surface
area for improved heat transfer.
◆Improve the physical properties of the product (such as fluidity, permeability, bulk density) to avoid segregation, pulsating, caking, bridges and other adverse effects happen in the follow-up procedure (drying, sieving, metering, metering, batching, etc.) Improve the production automation and closed operations to create the conditions.

Powder granulation techniques are generally divided into two types: wet and dry granulation. The dry method isn’t adding binder. It compacts into flakes/briquettes, and then use crushing, sieving to get granular product. Wet granulation is usually rotary drum, melt, spray and disc granulation. Take agricultural production for example: before the 1920s, chemical fertilizers are applied in powder. Although the powdered fertilizer is easy to mix, there are many weaknesses, such as segregation, agglomeration, poor flowability, and in the application process, it is dusty and get lost. During wet granulation, the wet strength of the capillary effect of liquid adhesion agent plays the utmost important role.When the subsequent drying, the chemical reaction of the group and the crystallization of dissolved matter forms the solid and crystal and makes granule forming. The typical technology is disc granulator, rotary drum and liquidation equipment etc.
The compacting granulation technology without adhesion agent is very competitive. Under normal condition, the granule is not formed through the granules’ solid bridging, but through the action force between molecules forming the granule strength. Due to the distance of action force is short and the sizes of the granule requested are almost same, it needs the external force. The method can adopt compacting material with the prescribed hole diameter or compacting on the two sides of powder).If the compacting happens in the gap of two rollers rotating in reverse, this process is called rolling granulation.

Operation principle

The dry powder material from the top to join, by deaeration, spiral preload to enter the gap between the rollers, the rollers of great pressure cause the material plastic deformation is compacted into a sheet. The sheet material is then crushed and screened to get the final granular products. The compacting pressure can be adjusted by the hydraulic cylinders according to the requirements of the granulation operation. Different pressure settings can get granular products of different strength.

Characteristics
1.The material is compacted into granules/briquettes through mechanical pressure, without adding any wet agent. The product purity is guaranteed.
2.The process flow has shorter and lower in power consumption as well as less accessory equipment and worker.

3.The dry powder can be granulated directly. No need of further drying.
4.Higher granule strength. Bulk specific gravity improvement is more obvious than other granulation methods.
5.More flexibility in operation.Wide application. The size of granule/briquettes strength can be adjusted through hydraulic pressure.
6.The system is closed loop operation realizing the continuous production

Irregular shaped granulation

1.Ball/oval shaped granulation

2.FGD gypsum granulation
3.Coal power granulation

4.Fertilizer granulation

5.Single fertilizer granulation

6.Nitrogenous phosphate compound fertilizer granulation

7.Humic acid organic fertilizer granulation

8.Fine chemical and chemical raw material