The fermentation process section and compound process section in the how to make organic fertilizer(one).The most important part is Granulation process section.

Granulation process section

(1) Crush(Fertilizer Crusher Machine)

Crush the materials with fermentation for 1 day, and dry, crush and screen the fermented organic materials.

(2) Compound and mixture(Fertilizer Mixer Machine)

In the process of making a series of special fertilizer, according to different soil conditions and different crops, to add the inorganic nutrients and minerals concentrated in organic matters and trace elements, and make the fertilizer contain various nutrients required by plant growth, such as nitrogen, phosphorus, potassium, sodium, manganese, zinc, copper and so on. According to the formula, mix nitrogen, phosphorus, potassium and fermented materials by computer, and transfer to granulator for granulation. We mix the formula of organic and inorganic materials according to different series of products and mix them fully in blender. Let us say the ratio of the organic material is 12 percent, the amount of it about 12tons.

(3) Granulation(Fertilizer Granulator Machine)

Due to the production of bio-fertilizers, mainly organic matters and cellulose, poor forming conditions, and the addition of a viable bacterial population with fertilizer making function, the production process should not be exposed to high temperature and other characteristics. The way of building material should not use disc granulating and rotary drum granulating method, because these two kinds of technologies, the requirements of raw material grinding fineness, high granulating moisture content, and generally the moisture content is about 30%, so the load is large for drying this, the loss is great of effective bacteria, and low rate of balling (about 60% ~ 70%), dust is heavy, the operating environment is poor in the production process.

Therefore, the production of organic bio-functions should be better by extrusion of environment, which has low requirement for raw material crushing, high molding rate (over 95%), low water content of the particles after the formation, low drying load, and can reduce the loss of effective bacteria, small dust and good operating environment.

The raw material of 70 tons of organic fertilizer, adopts the special granulator of organic fertilizer. After granulation, the material is fed into the dryer through belt conveyor for drying. The particle diameter is 3.0-4.0mm, and the granulation rate is more than 70%.
The recommended granulator is New Type Organic Fertilizer Granulator.

(4) Drying(Fertilizer Drying Machine)

In the production process of biological fertilizer, not only the water content of the particles generally exceeds the indicators after forming, requiring low temperature drying, but the moisture content of organic materials is about 30% ~ 40% after fermentation, and the moisture content of the particles after granulation is generally between 15% ~ 20%, which needs drying treatment ,because the fertilizer quality index of moisture content requires less than 14%, Therefore, the drying section is an indispensable and important process in the process of biological fertilizer production, which directly affects the output, quality and energy consumption. It is very important to choose the type and specification of the dryer reasonably and control the process conditions

To avoid the death of effective live bacteria because of the high temperature during drying process, so the material drying temperature shall not be higher than 60 ℃ (generally about at 50 ℃), so the hot blast temperature contact with the material should be different according to the moisture content of different material, generally no more than 130 ℃, it had better segmented control the hot blast temperature, namely it can improve the thermal efficiency, and also can avoid effectively the death of live bacteria. According to these features, the belt dryer is suitable, because this machine is suitable for low temperature and low moisture drying, and it can segmented control the temperature of the hot air to enter, to ensure that the material temperature is not higher than the drying temperature in the whole process, and the tail of dryer also can add the natural wind cooling section, to cool them immediately after material drying, having the function of multi-usage.

It is very suitable for granular bio-fertilizer with permeability to dry, and material drying steady and even, particles without any damage, residence time and the feeding speed can be adjusted to achieve the best effect of drying, because circulation of most of hot air, and high thermal efficiency, the heat source may use the steam provided by the biogas boiler

There is a secondary granulation area at the front of the dryer，where the materials can achieve secondary granulation. Then the material will be raised through the plate to fully dry, the exhauster will take out moist hot air through pipelines in the dryer tail ,the air enters into the sedimentation chamber for settling, After passing through sedimentation, the tail gas is sprayed through the scrubber tower for dust removal, the spray water is pumped out for recycling use, after secondary dust removal, exhaust gas discharged into the atmosphere through the chimney .

(5) Cooling(Drum Cooler)

Drying materials are cooled by belt conveyor and feeding into the cooler ,the cooling process mainly involves the use of wind fans to feed natural air into the cooler through pipelines to cool the materials. The wind direction in the cooling machine is reverse flow. The exhaust gas pumped into the settling chamber by the fan and pipe is treated and discharged into the atmosphere as the drying exhaust gas

Materials were screened after cooling, and the large particles of materials are crushed were transported inte granulator with the sifted powder by the return belt for regranulation, and the finished products enter the automatic packaging system for packaging.

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