Russian compound fertilizer particles with holes in the middle of the hole this hole is how to come there is know

Russian compound fertilizer particles with holes in the middle are formed during the production process through the high tower granulation process.

In the process of manufacturing compound fertilizer, solid urea or ammonium nitrate (ammonium nitrate phosphorus, etc.) is first heated and melted to become a molten liquid, or the molten liquid after evaporation and concentration is used directly. Then, in the molten liquid added to the corresponding phosphate fertilizer, potash, filler and additives to make a mixed slurry. Mixed slurry is sent to the high tower granulator for spray granulation, through the granulator spray into the granulation tower granulation material, in the process of descending from the tower, and rising from the bottom of the tower gas resistance interaction, and its heat exchange and landed at the bottom of the tower, falling into the bottom of the tower granular material, after screening surface treatment to get the particles of composite fertilizers.

Because of the tower granulation process so that the formation of composite fertilizer particles in the center part of the material is brought to the surface of the particles by the gas, the formation of the central porous structure, so the middle of the composite fertilizer particles will have holes.