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 roller press granulation, rotary drum (steam) granulation, disc pan granulation, spray granulation, and High tower granulation.
The main machines for the NPK fertilizer production line: automatic batching system, grinding machine, mixing machine, roller press granulator, rotary dryer machine, rotary cooler machine, rotary screener, rotary coating machine, packing machine, PLC controller, and belt conveyor to connect each machine.
|
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 suMAP(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 |
Batching |
Automatic batching system |
Ratio raw materials by formula |
|
2 |
Grinding process |
Grinding machine |
Grind 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 |
|
Roller press granulator |
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 granules |
|
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.
