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Technology for Bulk Blending Fertilizer Production

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.

New Type Organic Fertilizer Production Line

New Type Organic Fertilizer Production Line

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

Double shaft mixer for npk blending plant

NPK fertilizer production with double shaft mixer is the latest technology product developed by Agricultural Machinery Research Institute based on years of experience in design and production of organic fertilizer and NPK compound fertilizer manufacturing process and equipment, which has obtained the national practical patent. It is used for granulation of various organic substances after fermentation, breaking through the conventional organic granulation, without drying and crushing the raw materials before granulation. It can directly process cylindrical particles, which can save a lot of energy.

NPK Drum Granulation Line

NPK Drum Granulation Line

Production characteristics of NPK fertilizer with double shaft mixer

(1) The product particles are cylindrical
(2) The content of organic matter can be as high as 100% and made into pure organic particles
(3) The organic particles embedded with each other and growing up under a certain force are used, and there is no need to add adhesive during granulation.
(4) The product has large particles and can be directly screened after granulation to reduce drying energy consumption
(5) After fermentation, the organic matter does not need to be dried, and the moisture content of raw materials can reach 20% – 40%
(6) 4. The stirring blade is welded with hard steel head, with good wear resistance and long service life.

Working principle of NPK fertilizer production with double shaft mixer:

First, a fixed amount of raw powder flows into the mixing tank through the feed port, and then the water is integrated at a certain temperature.
Secondly, a certain length of shaft is used to mix the raw powder through stirring blades to form a core bulge containing certain moisture.
Third, put the core bulge into the ball plate and stir. The whole mixing is divided into atomization area, mixing area and discharging area.

More details, go to