In the roller press granulator production line,the roller press
granulator machine is the main fertilizer machine to make the compound fertilizer
granulator.There are more than 20 kinds of materials that have been
successfully applied to granulating. Ammonium nitrate, urea,
ammonium chloride and calcium nitrate in nitrogen fertilizer.
Phosphate fertilizer includes ammonium phosphate, calcium
phosphate, heavy calcium, phosphate rock, potassium chloride and
potassium sulfate, and can add trace elements such as boron, iron,
copper, zinc, manganese and so on. Extrusion granulation has no
special requirements on the granularity of the raw materials, 1-4mm
granular materials and fine powdery materials are available, it’s
better to use the granularity of powder material and powdery
products , and the cost can be reduced with powdery materials.
The mainly equipment that the roller press granulator production
line include:
1.Batching machine
2.Roller press granulator
3.Crusher
4.Screening machine
5.Coating machine
6.Belt conveyor
7.Automatic packing machine
The process of roller press granulator production:
1.Storage and measurement
Mixed fertilizer raw materials such as urea, ammonium phosphate and
potassium chloride are transported from bucket elevator and belt to
storage bins.
2.Squeeze
After mixing, the mixture of fertilizers is extruded by roller. The
principle is to shape the material through extrusion. The mixture
is fed into the gap between the two oppositely rotating rollers
through a vertical screw feeder. During the extrusion process, the
pressure of the material gradually increases, and when the gap
between the two axes is in a very small position, The material is
relatively stressed and then gradually decreases until reach the
zero.
3.Crushing and classified
The plate formed in the roller press should be further broken, and
if you want to reach the demanded particle size, you need to
through the classified. There is a particular designed plate
crusher under the roller press machine, the plates have been
crushed the slices by it. The fine particles on the lowest sieve
are recycled to the mixer and then extruded. However, the large
particles retained on the top of the multi- stage sieve need to be
further broken. After crushing, it returns to sieving. It’s very
important to make a correct choice about the crushing and screening
machine, it has a great effect to the economic of the press and
granulator system.
4.Polishing and dressing
In usual, the final products need to through the polishing and
dressing. Irregular shaped particles are worn round the drum to
circle the edges and corners. The fine powder produced during
polishing is recycled through screening . When dressing, the anti
caking agent is usually added. The final product of the plant is
granular fertilizer (1-4mm) within a certain range of granularity.
