The working principle of the disc granulator in the fertilizer production line

The disc granulator machine is mainly used in the NPK fertilizer production line and organic fertilizer production line to produce various granular products; it’s also used in pharmaceutical products, fertilizers, feeds, etc. Adopting the overall arc structure, the granulation rate can reach above 93%. The granulation tray has three discharge ports, which facilitates intermittent production operations, greatly reduces labor intensity and improves labor efficiency.

disc granulator machine

Disc fertilizer granulator machine working principle:
The raw meal powder is uniformly wetted by the atomized water in the mixer to form a spherical core having a uniform particle size, and then fed into a ball plate for ball formation. The moisture of the ball should be controlled at 12-14%. Most of the water should be added in the twin-shaft mixer. Only a small amount of supplementary water is added to the ball plate, and the amount of water added is controlled to be about 0 to 3%. The dry powder granulation is directly added to the ball-forming plate, and the proper amount of water is sprayed. The raw material nucleus enters the spherical disk and is subjected to centrifugal force, friction and gravity in the disk, and moves along the parabola. Due to the cohesiveness and plasticity of the material, the cores are bonded to each other and gradually grow up during the movement. When the inclination angle of the ball disc, the height of the disc edge, the rotation speed and the moisture are constant, the balls of different particle sizes roll downward from the edge of the disc at different disengagement angles due to different gravity. During the continuous rolling process, the ball continuously discharges the water in the ball out of the surface. Due to the cohesiveness of the material and the natural volatilization of the surface liquid film, the ball has certain strength, and then the disk is rotated with the tilting of the disk. The sides are discharged out of the pan.

Disc granulator performance advantages:
1. The raw materials are suitable for a wide range of applications. They can be used for granulation of various raw materials such as compound fertilizer, medicine, chemical feed, coal, metallurgy, etc., and can produce various concentrations and various types (including organic fertilizer, inorganic fertilizer, and magnetic fertilizer etc.) of compound fertilizer.
2. The disc granulator is light in weight, low in height, and flexible in process;
3. The machine has simple structure, convenient adjustment and superior performance.
4. The use of unique unpowered combination scraper integration reduces auxiliary power consumption.

5, high ball formation rate, large rounded particle strength, intuitive operation, easy maintenance and so on.

Fertilizer granulator machine is the core equipment for fertilizer manufacturing process. As one of leading fertilizer machine manufacturers in China, in addition to the disc granulator, we also produce other types of fertilizer granulator machines, and other equipment such as compost turning machines, mixer machine, crusher machine, etc.

Other article for your reference:Chicken manure organic fertilizer production line

Main Granulating Methods of NPK Compound Fertilizer Production

NPK fertilizer can supply many kinds of nutrients needed by crops at the same time. The economic benefit is obvious. The production cost can be reduced by using compound fertilizer.

Compound fertilizer is not easy to agglomerate, easy to store and use, and is widely welcomed. How to select granulator for NPK fertilizer production line? Several main granulation methods are introduced here.

 

  1. Solid aggregate method

The basic monomer fertilizers such as urea, ammonium nitrate, ammonium chloride, ammonium sulfate, monoammonium phosphate, diammonium phosphate and potassium chloride are used as raw materials. After crushing to a certain fineness, the materials are agglomerated and granulated in a disc fertilizer granulator (or rotary drum granulator) by adding water and heating. NPK compound fertilizer products can be obtained by drying, cooling and sieving granules, which is also one of the widely used methods in the world.

This method has a wide range of raw materials, simple processing process, less investment, low production cost, flexibility, and raw materials are solid. Because it is a secondary process of basic fertilizer, there is almost no environmental pollution problem.

 

  1. Bulk blending method

According to the requirement of nutrient distribution ratio, mixed fertilizers with uniform nutrient distribution were prepared from various solid basic fertilizers of nitrogen, phosphorus and potassium without obvious chemical reaction, with basically identical granularity and roundness. The process of this method is simple and the investment cost is low, mainly use bulk blending mixer. It is a very practical and easy to promote method.

Bulk blending fertilizer has comprehensive nutrients, high concentration and flexible formula. It can be flexibly changed according to the different conditions of crop nutrition, soil fertility and yield level. The method is simple in processing, low in production cost and pollution-free.

 

  1. Extrusion method

Extrusion granulation is a dry granulation process in which solid materials are agglomerated by external pressure. Double roller press granulator is mainly used for granulation. The machine have two shaft with one fixed and the other can move, which can adjust the distance between the two shafts. And the granules will be extrude between the shafts.

Double Roller Press Granulator

Extrusion method of NPK fertilizer production has the following advantages:

(1) Drying and cooling processes are generally not needed in the production process, which can save investment and energy consumption.

(2) The operation is simple and there is no three wastes discharged during production.

(3) High-concentration compound fertilizer with lower concentration than general compound fertilizer can be produced. Organic fertilizer and other nutrients can also be added in production according to need. The production capacity of a single extruder is small. If large-scale production is needed, it can be combined with multiple units for factory production.

Potassium chloride production process by disc granulator machine

In the production of potassium chloride granular fertilizer, fertilizer granulator can be used to granulate powder. The particles produced by disc granulator are spherical and have good strength, which can be widely used in agricultural production.

 

Disc Pan Granulator

In the granulation process of disc pan granulator, it is necessary to add a binder to make the granules shape. Binder can be compounded by common inorganic minerals in a certain proportion. Binder has synergistic effect when potassium chloride is pelleted. The effect of pelletizing rate and particle strength is good when the binder is used for pelletizing. Potassium chloride was granulated by disc pan granulator machine, and the granules were spherical.

Pan Granulator NPK Fertilizer Production Line

NPK Fertilizer Production Line

NPK fertilizer production line deals with potassium chloride fertilizer. First, all raw materials are mixed by the batching system, and the material is crushed by chain mill to the appropriate size. The disc granulator makes the powder into granules. After drying and cooling, the granules of potassium chloride are coated with protective film by the fertilizer coating machine to complete the granular processing of potassium chloride.

 

When applying potassium chloride, attention should be paid to the appropriate period of potassium application. Generally, the application period of potassium fertilizer should be early or not late, and should be used as base fertilizer and early recovery period. When the application amount of potassium fertilizer is less, it can be used as base fertilizer once, and when the application amount of potassium fertilizer is more or the soil texture is lighter, the application effect is better divided into base fertilizer and topdressing fertilizer. Soil nutrients and fertilization status should also be taken into account in determining the suitable application period of potassium fertilizer. In severe potassium deficiency soils, all potassium fertilizers should be used as base fertilizers in medium soil potassium supply, and suitable organic fertilizers should be applied as base fertilizers, combined with topdressing.

 

Note the method of application of potassium chloride. The concentrated application of potassium fertilizer is beneficial to improve its utilization rate and obtain better results. However, it is not advisable to have direct contact with seeds or seedlings. For general crops, a combination of soil fertilization and foliar fertilization can be used.