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Blended fertilizer is also called BB fertilizer. It is made by mixing two or more granular high-nutrient raw materials as required. Because its formula is easy to adjust, it is especially suitable for areas with large land areas, complex soil types and a wide variety of crops. Blended fertilizer, also known as dry blended fertilizer, is a chemical fertilizer containing any two or three of the three nutrient elements of nitrogen, phosphorus, and potassium. It is made from straight fertilizer or compound fertilizer through simple mechanical mixing. There is no significant chemical reaction. The production technology of blended fertilizers is simple. In the United States, blending operations and fertilizing operations should be carried out on the same day as much as possible. In this case, the storage performance of the product does not need to be considered. In many countries, mixed fertilizers need to be packaged and stored for a period of time, so the storage performance of the product is very important. All raw materials should be dry, uniform in particle size, and high in strength to prevent the product from absorbing water, agglomerating and particle separation during storage and transportation.

There are three forms of mixed fertilizer production:

• Regional small-scale production. Products are usually sold within a range of tens of kilometers. This form is very common in the United States. In recent years, there are more than 5,300 sets of BB fertilizer production lines, and the average annual output of each lineis about 2.5kt.
• A large-scale BB fertilizer production line built in the port area or the transportation center area. The basic fertilizer is usually transported by ship, and the product is packed into the market in a larger area. The annual production capacity of each device is 30-300kt.
• Produced by a basic fertilizer production plant. Generally, several units or compound fertilizers are produced first, and then the blending operations are carried out to produce blended fertilizers of various specifications. For example, the compound fertilizer specifications (N-P2O5-K2O percentage) that can be produced by adding potassium chloride in the production process of ammonium phosphate are 14-37-12, 12-32-16, and 10-25-25, etc., and they are combined with ureato produce various blended fertilizers. The production process of blended fertilizers is relatively simple. Various basic fertilizers are unloaded into the warehouse and then metered and mixed. Products are delivered directly to users by cars or into storage silos.

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Brief introduction of BB fertilizer production process:

1. The nitrogen, phosphorus, potassium, filler and other raw materials are transported to the relevant silos.
2. After weighing by each automatic metering device, it is sent to the premixer.
3. It is transferred to the horizontal BB fertilizer mixer (intermittent and continuous), the particles rotate through the horizontal BB fertilizer mixer to form an irregular curtain, and the evenly mixed particles incline slowly along the direction of the mixer. The discharge port rolls.

4. Transfer to the finished product bin, slide into the automatic packaging scale for weighing, packaging and warehousing.

The key to the production of BB fertilizer (mixed fertilizer) is as follows:

Follow the rules of chemical compatibility.

1. After mixing different base fertilizers, some reactions will reduce the critical relative humidity (CRH) and make the products absorb moisture and agglomerate. For example, urea and ammonium nitrate cannot be mixed directly. Because the CRH of the mixture is only 18.1%, most areas will absorb moisture, and some reactions will even cause nutrient loss, such as ammonium nitrogen (ammonium nitrate, ammonium sulfate, ammonium phosphate, etc.).

It should be mixed with alkali fertilizer with strong chemical activity (such as hot phosphorus fertilizer and potassium fertilizer) to avoid the loss of ammonium nitrogen (NH4-N). The addition of neutralizing agent (such as limestone, dolomite powder, etc.) in the mixed fertilizer also caused nitrogen loss.

2. Superphosphate and ammonium nitrate are mixed to form calcium nitrate [Ca (NO3) 2], which makes BB fertilizer (mixed fertilizer) viscous.

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3. When superphosphate is mixed with urea, crystal water will precipitate, but ammoniated superphosphate can be mixed with ammonium phosphate to obtain stable synthetic fertilizer. Ammonium superphosphate is mixed with ammonium nitrate or urea and chlorinated. The product made from potassium is more dry and has better fluidity than that made from granular calcium.

The dry liquid mixed fertilizer with nutrient concentration more than 50% can be obtained by using ammonium phosphate formula, and the qualified calcium phosphate is only 25% ～ 31%. Calcium is mixed with ammonium sulfate. It starts to heat up, then it settles, the water gets wet and forms a hard lump.

Strictly use of grain based fertilizer to reduce secondary separation

1. The strength of basic granular fertilizer should be guaranteed first. Its static strength should not be less than 2 × 106pa, can bear the extrusion, friction and other external forces in the production process without pulverization.

2. The grain size range of each base fertilizer is – 6 + 16 mesh, and the dosage of each material is between 25% and 45%. When the difference of the middle particle size of different components is less than 10%, the mixture will not be separated again. In addition, the turbulence and storage in the mixing process are reduced, and the soft mixing is realized, which can effectively reduce the segregation and secondary separation of the mixed products. More details, go to https://www.fertilizer-plants.com/fertilizer-blender/