Manufacturing Process of NPK Compound Fertilizer One

 

 

Take the single fertilizer such as urea, ammonium nitrate, ammonium chloride, ammonium sulphate, ammonium phosphate, monoammonium phosphate, diammonium phosphate, and coarse whiting, ca) potassium chloride, potassium sulfate as raw material, after grinding to a certain fineness, material in the drum granulator or disc granulator rolling was gathered and granulated by humidifying and heating, in the process of granulating, join a small amount of phosphoric acid and ammonia in a rotary drum granulator, to improve the granulating conditions. NPK composite fertilizer products are processed by drying, sieving and cooling of granulated materials which is also one of the methods widely used in the world. The early United States, India, Japan, Thailand, they all adopt this method -Solid agglomeration process to produce compound fertilizer.
                   

 

Raw materials 

  1．NPK 

  2．Chemical material 

  3．Phosphate

  4．Potash 

  5．Metal ore powder

  6．Animal manure

  7．House refuse 

  8．Other chemical and inorganic raw material 

 

Working Process

1. Horizontal Mixer

It is mainly used to mix raw material. The polypropylene-lined plate or stainless steel plate makes it no material-sticking and stands wear and tear, it has the advantages of compact, easy to operate, stirring evenly, easy to discharge, etc.

2. Disc Granulator 

It is one of common equipment in compound fertilizer industry. Generally, it is applicable to smaller scale fertilizer production of medium and low concentration. The slope degree of its disc can be adjusted from 40° to 55°.

The disc revolves at a certain angle with the horizontal plane driven by the motor through reducer. The powder will rise along with the revolving disc under the friction between the powder and the disc; on the other hand, the powder will fall down under the function of gravity. At the same time, the powder is pushed to the disc edge because of the centrifugal force. The powder materials roll in a certain trace under the function of these three forces. It gradually becomes the required size, then overflow by the disc edge. It has the advantages of high granulating rate, homogeneous grain, high strength, easy to operate, convenient to maintain, etc.