The role of fertilizer making by Rotary drum granulator :
Over the years, compound fertilizers have been used on a large scale both internationally and domestically, because compound fertilizers have complete nutrients and few secondary components. Not only the total nutrient content of compound fertilizer is high, but also there are many types of nutrient elements. Generally speaking, compound fertilizer contains more than two or three types of nutrient elements, which are essential nutrients for crops. Compound fertilizers contain nitrogen, phosphorus, calcium, magnesium, sulfur, iron, manganese, copper, zinc, boron, molybdenum, chlorine and other essential nutrients for crops, which can meet the needs of crops for various nutrients. At the same time, because the compound fertilizer has few side components, it generally does not contain any useless side components, has no toxic effect on the crop soil, and can reduce or even eliminate the adverse effects caused by the side components. Soil is the foundation of agriculture, and fertilizer is the “grain” of crops. Fertilizer is an important and indispensable material support for the current growth of food production. Compound fertilizer has the advantages of high nutrient content, less auxiliary components and good physical properties. It plays a very important role in balancing fertilization, improving fertilizer utilization rate, and promoting high and stable yield of crops. According to the test results of the National Fertilizer Test Network: a reasonable combination of nitrogen, phosphorus and potassium can increase the yield of rice by 40.8%, corn by 46.1%, wheat by 56.6%, cotton by 48.6%, rapeseed by 64.4%, and soybean by 17.9%. Therefore, it is imperative to develop high-concentration compound fertilizer.
Preliminary program of process technology of Rotary drum granulator:
The raw materials are all crushed, and after mixing, the computer automatically batches the ingredients, adopts steam-added drum granulation, drum dryer, drum cooler, and after screening, the product is automatically packaged, and non-finished products are returned to granulation after crushing.
a) Raw material ingredients: urea, ammonium nitrate, ammonium chloride, ammonium sulfate, ammonium phosphate (monoammonium phosphate, diammonium phosphate, heavy calcium, general calcium), potassium chloride (potassium sulfate) and other raw materials are equipped in a certain proportion (( According to market demand and local soil testing results).
b) Stirring of raw materials: Stir the prepared raw materials evenly to increase the uniform fertilizer content of the fertilizer granules as a whole.
c) Raw material granulation: Send the uniformly stirred raw material into the granulator for granulation (it can be granulated by stock transfer or extrusion granulation).
d) Drying of granules: Send the granules produced by the granulator into the dryer, and dry the moisture contained in the granules to increase the strength of the granules and facilitate storage.
e) Granule cooling: The temperature of the dried fertilizer granules is too high and it is easy to agglomerate. After cooling, it is convenient to store in bags and transport.
f) Particle classification: classify the cooled particles, crush and re-granulate the unqualified particles, and screen out the qualified products.
g) Finished film: Coating and coating qualified products to increase the brightness and roundness of the particles.
h) Finished product packaging: the particles that have been wrapped with film, that is, the finished product, are bagged and stored in a ventilated place.
