Process introduction of compound fertilizer extrusion granulation process:
1) Add the qualified raw materials to the fertilizer mixer
according to the ratio of the ratio and mix well.
2) Transfer to the disc feeder to clean the iron in the material during the conveying process.
3) The material in the disc feeder enters the extrusion granulator
uniformly, the material is forced to pass between the two pressure rollers and is extruded into a sheet, and the sheet is broken into pieces by the coarse crusher under the pressure roller. After sieving, the material on the sieve continues to be broken and sieved.
4) The semi-finished product is conveyed to the finished sifter, and the fine particles after the screening are directly returned to the disc feeder, and the large particles are pulverized by the pulverizer and then returned to the disc feeder.
5) The qualified products after screening is transported to the fully automatic packaging scale for weighing, packaging and storage.
Production of compound fertilizer by extrusion granulation has the following advantages and disadvantages.
A) Extrusion granulation does not require heating and humidification of the material, which saves investment and saves energy, and can also be adapted to granulation of ingredients containing heat sensitive materials such as ammonium bicarbonate and certain organic fertilizers.
B) There is no waste water or exhaust gas in the production process, which will not pollute the environment.
C) The extrusion granulation process
is short, easy to operate, easy to achieve production automation control, and improve production efficiency.
D) There is no special requirement for the nature and particle size distribution of the raw materials, so the source of raw materials is broad.
E) The production is more flexible, and the product can be changed at any time, which is beneficial to the production of specialty fertilizers in small batches.
F) The product has a uniform particle size distribution, does not cause segregation, and does not agglomerate.
G) The shape of the extruded granulation product is not as round as that produced by traditional methods such as drum granulation and slurry granulation; if a chemical reaction occurs between the components of the product granules, the granules may be cracked.