SOLUTION
NPK fertilizer, which also called compound fertilizer, are fertilizers made by chemical and/or physical methods, with at least two of the three nutrients being labeled as nitrogen, phosphorus, and potassium, as well as micro elements such as Mn/Zn/Cu/Mo etc. Its appearance is granular, strip-shaped, or sheet-like products, with no mechanical impurities.
The common granulation processes for NPK fertilizers include extrusion granulation, drum (steam) granulation, disc granulation, spray granulation, and High tower granulation.
|
Item |
Technical indicators |
||
|
High density |
Medium density |
Low density |
|
|
Total nutrients(N+P2O5+K2O)/% |
≥40 |
≥30 |
≥25 |
|
Water-soluble phosphorus to available phosphorus/% |
≥60 |
≥50 |
≥40 |
|
NO-N/% |
≥1.5 |
≥1.5 |
≥1.5 |
|
Moisture content/% |
≤2 |
≤2.5 |
≤5 |
|
Size(1-4.75mm or 3.35-5.6mm)/% |
≥90 |
≥90 |
≥90 |
Note: the indicators above is based on chinese standard, only for reference, different country maybe different.
| No. | Types of materials | Raw materials list |
| 1 | Nitrogen | Urea,Calcium nitrate,Ammonium bicarbonate,Ammonium chloride,Nitrate of soda,Ammonium sulphate nitrate,Ammonium sulphate,Ammonium nitrate,etc |
| 2 | Phosphorus | MAP(Monoammonium phosphate), DAP(diammonium phosphate),SSP(calcium superphosphate),TSP(triple superphosphate), calcium magnesium phosphate fertilizer, etc |
| 3 | Potassium | MOP(Potassium chloride),SOP(potassium sulfate),Potassium nitrate, potassium phosphate, potassium hydroxide, etc |
|
No. |
Processes |
Machines |
Function of machines |
|
1 |
Dosing |
Automatic dosing system |
Ratio raw materials by formula |
|
2 |
Crushing process |
Crushing machine |
Crush raw material into powder(if need) |
|
3 |
Mixing and blending process |
Mixer/Blender |
Mix powder evenly, If need, |
|
4 |
Granulation |
Feeding |
Feed mixed powder into granulating machine evenly |
|
Granulating machine |
Make mixed powder into fertilizer granules |
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|
5 |
Drying process (if need) |
Rotary dryer |
Dry fertilizer granules to low moisture by hot |
|
Hot furnace |
Generate hot air to dryer |
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|
cyclone |
collect dust from dryer |
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|
6 |
cooling (if need) |
Rotary cooler |
cool fertilizer granules to normal |
|
cyclone |
collect dust from cooler |
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|
7 |
Screening |
Screening machine |
screen out required size from fertilizer |
|
8 |
Coating process (if need) |
Rotary coating machine |
Coat color, anti-blocking agent, micro elements etc on fertilizer granules |
|
9 |
Packaging |
Air compressor |
Generate air source to packaging machine |
|
Packaging |
Package fertilizer granules into bags |
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|
10 |
Delivering process |
Belt conveyor |
Connect each machine, and deliver the powder or granules to next process |
|
11 |
Controlling process |
PLC controller |
Control all machines |
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Hydraulic roller press granulation production line, which also called powder compaction granulation production line
Compound fertilizer, which also called NPK fertilizer, are fertilizers made by chemical and/or physical methods
Bulk blending fertilizer, also known as Blended fertilizer or BB fertilizer or dry mixed fertilizer.
