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Introduction to BB fertilizer production line and technology
2019-07-04
Brief introduction of BB fertilizer production process:
1. Transfer raw materials such as nitrogen, phosphorus, potassium, and filler to each relevant silo.
2. Weighed by each automatic metering device and fed into the pre-mixing tape machine.
3. Transfer to the horizontal BB fertilizer mixer (intermittent, continuous), the pellets are rotated by the horizontal BB fertilizer mixer to form an irregular curtain, and the uniformly mixed pellets are slowly inclined along the direction of the mixer. The discharge port rolls.
4. Transfer to the finished silo, slip into the automatic packaging scale weighing, packaging, storage.
The key to the production of BB fertilizer (blend fertilizer):
I. Rules to comply with chemical compatibility.
1. After mixing different base fertilizers, some reactions will lower the critical relative humidity (CRH) and make the product absorb moisture and agglomerate. For example, urea and ammonium nitrate cannot be directly blended. Because the CRH of the mixture is only 18.1%, most areas will absorb moisture, and some reactions may even cause nutrient loss, such as ammonium nitrogen (ammonium nitrate, ammonium sulfate, ammonium phosphate, etc.). It should be mixed with chemically active alkaline fertilizers (such as thermal phosphorus fertilizer and potash) to avoid the loss of ammonium nitrogen (NH4-N). Adding neutralizing agents (such as limestone, dolomite powder, etc.) to the blended fertilizer will also cause the loss of nitrogen.
2. The mixing of superphosphate and ammonium nitrate produces calcium nitrate [Ca(NO3)2] which causes BB fertilizer (blend fertilizer) to become viscous.
3. When superphosphate is mixed with urea, crystal water will be precipitated, but ammoniated superphosphate and ammonium phosphate can be mixed to obtain a stable synthetic fertilizer. Ammonium superphosphate is mixed with ammonium nitrate or urea and added with chlorination. The product obtained from potassium is dried than the blended fertilizer prepared from granular calcium and has good fluidity. The ammonium phosphate formula can be used to obtain a dry and fluid blending fertilizer with a nutrient concentration greater than 50%, and the blending pass calcium phosphate is only 25% to 31%. Calcium is mixed with ammonium sulfate. It starts to heat up and then precipitates moisture to become damp and form a hard mass.
II. Strictly use the grain-based matching base fertilizer to reduce the secondary separation
1. The basic granular fertilizer used in the blending method is first required to ensure its strength. Its static strength should not be lower than 2×106 Pa, and it can withstand external forces such as extrusion and friction in the production process without pulverization.
2. The particle size range of each basic fertilizer is -6+16 mesh, and the amount of +8 mesh of each material is between 25% and 45%. When the difference in particle size of the intermediate particle size of different ingredients is less than 10%, the mixture will be no secondary separation. In addition, the bumping and storage during the mixing process are reduced, and the soft mixing is achieved, which can effectively reduce the partial set and secondary separation degree of the blended product.
1. Transfer raw materials such as nitrogen, phosphorus, potassium, and filler to each relevant silo.
2. Weighed by each automatic metering device and fed into the pre-mixing tape machine.
3. Transfer to the horizontal BB fertilizer mixer (intermittent, continuous), the pellets are rotated by the horizontal BB fertilizer mixer to form an irregular curtain, and the uniformly mixed pellets are slowly inclined along the direction of the mixer. The discharge port rolls.
4. Transfer to the finished silo, slip into the automatic packaging scale weighing, packaging, storage.
The key to the production of BB fertilizer (blend fertilizer):
I. Rules to comply with chemical compatibility.
1. After mixing different base fertilizers, some reactions will lower the critical relative humidity (CRH) and make the product absorb moisture and agglomerate. For example, urea and ammonium nitrate cannot be directly blended. Because the CRH of the mixture is only 18.1%, most areas will absorb moisture, and some reactions may even cause nutrient loss, such as ammonium nitrogen (ammonium nitrate, ammonium sulfate, ammonium phosphate, etc.). It should be mixed with chemically active alkaline fertilizers (such as thermal phosphorus fertilizer and potash) to avoid the loss of ammonium nitrogen (NH4-N). Adding neutralizing agents (such as limestone, dolomite powder, etc.) to the blended fertilizer will also cause the loss of nitrogen.
2. The mixing of superphosphate and ammonium nitrate produces calcium nitrate [Ca(NO3)2] which causes BB fertilizer (blend fertilizer) to become viscous.
3. When superphosphate is mixed with urea, crystal water will be precipitated, but ammoniated superphosphate and ammonium phosphate can be mixed to obtain a stable synthetic fertilizer. Ammonium superphosphate is mixed with ammonium nitrate or urea and added with chlorination. The product obtained from potassium is dried than the blended fertilizer prepared from granular calcium and has good fluidity. The ammonium phosphate formula can be used to obtain a dry and fluid blending fertilizer with a nutrient concentration greater than 50%, and the blending pass calcium phosphate is only 25% to 31%. Calcium is mixed with ammonium sulfate. It starts to heat up and then precipitates moisture to become damp and form a hard mass.
II. Strictly use the grain-based matching base fertilizer to reduce the secondary separation
1. The basic granular fertilizer used in the blending method is first required to ensure its strength. Its static strength should not be lower than 2×106 Pa, and it can withstand external forces such as extrusion and friction in the production process without pulverization.
2. The particle size range of each basic fertilizer is -6+16 mesh, and the amount of +8 mesh of each material is between 25% and 45%. When the difference in particle size of the intermediate particle size of different ingredients is less than 10%, the mixture will be no secondary separation. In addition, the bumping and storage during the mixing process are reduced, and the soft mixing is achieved, which can effectively reduce the partial set and secondary separation degree of the blended product.