What is the working principle of the roller extrusion granulator in the NPK fertilizer production line

 The roller extrusion granulator is an efficient and critical equipment in the NPK (nitrogen phosphorus potassium) fertilizer production line, mainly used to convert dry powder or slightly moist raw materials into uniform particle form. Its working principle is based on the combination of high-pressure extrusion and shear force, and the specific process is as follows:


Workflow

Raw material feeding: The raw material (usually NPK fertilizer powder pre mixed and adjusted to the appropriate humidity) is fed between two opposing rotating rollers.

High pressure extrusion: These two rollers are driven by strong mechanical pressure. When the raw material reaches the narrowest point between the two rollers, it is subjected to tremendous extrusion force, causing plastic deformation and compression into thin sheets.

Fragmentation: Subsequently, due to the discontinuity of its own structure and the effect of internal stress, this thin sheet immediately fractures after leaving the roller, forming many smaller blocks.

Secondary shaping: By adjusting the texture or shape of the roller surface, the fractured block can be further broken into more regular particles, or directly formed into preliminary particles with certain strength and shape.

Cooling and shaping: The formed particles may subsequently require cooling treatment to solidify their structure and prevent deformation or fragmentation during subsequent processing or storage.

Principles of Physics

The granulation process of the roller extrusion granulator mainly depends on the plastic flow characteristics of the material. When the applied pressure exceeds the yield limit of the material, the originally loose powder like raw materials are forced to arrange tightly, reducing the distance between molecules and generating strong binding forces, thereby "fusing" the material into a compact particle structure.

critical factor

Raw material properties: Different raw material formulas and humidity levels can affect the granulation effect, and adjustments need to be made according to specific circumstances.

Roller material and surface treatment: The selection of rollers and their surface characteristics (such as texture depth, hardness, etc.) directly affect the quality of particles, such as hardness, shape, and size uniformity.

Pressure and speed control: The pressure and rotational speed between the rollers are also important factors determining the granulation effect, and need to be carefully balanced to achieve the best results.

By precise control of these key parameters, the roller extrusion granulation machine can efficiently produce uniform and high-strength NPK fertilizer particles, meeting the high standard requirements of agricultural production.

评论

发表评论

此博客中的热门博文

Three forms of granulation for processing fertilizers in compound fertilizer production lines

图片
  In the  drum granulator , steam, ammonia gas or phosphoric acid or nitrogen solution, phosphorus ammonia slurry, and barite slurry are introduced into the drum to complete the granulation process of chemical reaction and heat supply in the cylinder; or the cold granulation process of compound fertilizer with a small amount of water is added. The materials to be granulated are rolled and rotated in the cylinder, and agglomerate into balls under certain humidity and temperature, Complete the ball making process. NPK fertilizer granulator  of compound fertilizer is produced by non drying process at room temperature, with one-time molding and output of 1-4t / h. Complete set of equipment process layout compact, scientific and reasonable, advanced technology. Energy saving and consumption reduction, no three wastes discharge, stable operation, reliable operation and convenient maintenance. It is suitable for granulation of compound fertilizer, medicine, chemical industry, fe...
阅读全文

How to use disc granulator to process organic fertilizer particles

图片
Bio-organic fertilizer   that uses animal manure and straw to be processed by beneficial microbial fermentation and organic fertilizer production equipment. Bio-organic fertilizer contains a large number of beneficial microorganisms, and the application effect is remarkable. Organic fertilizer type (1) Crop straw decomposition agent, livestock and poultry manure, organic waste starter. (2) Microbial inoculants refer to liquid viable bacterial products produced by liquid fermentation of known beneficial microorganisms or solid viable bacterial products adsorbed by aseptic carriers. The unstable quality of organic fertilizer products is the main problem in the production of microbial inoculants. The main reasons are bacteria, carriers and fermentation equipment. The main manifestations of strains are mixed strains, degradation of strains, unreasonable combination of strains and so on. (3) Photosynthetic bacteria fertilizer, photosynthetic bacteria fertilizer is developing...
阅读全文

What are the complete NPK fertilizer production line processing equipment available

图片
  The complete set of   NPK fertilizer production line   manufacturing and processing equipment mainly includes the following categories: Fermentation equipment: This type of equipment is mainly used for the fermentation process of raw materials, such as fermentation flipping machines, which can flip the materials during the fermentation process, provide sufficient oxygen and control temperature, making the fermentation of raw materials more uniform and sufficient. Crushing equipment: such as an organic fertilizer crusher, used to finely crush fermented materials, making the size and state of the materials uniform. Mixing equipment: such as a mixer, used for stirring and mixing various raw materials to ensure the uniformity of the raw materials. Granulation equipment: such as a toothed granulator or a  disc granulator , etc., which produces uniformly sized granular fertilizers from crushed materials. Drying and cooling equipment: such as drum dryers and cooling machi...
阅读全文