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27
2020
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Common granulation process of compound fertilizer
Common granulation processes of compound fertilizer include drum granulation, disc granulation, gunite granulation and tower granulation. Each granulation process has certain advantages.
Common granulation processes of compound fertilizer include drum granulation, disc granulation, gunite granulation and tower granulation. Each granulation process has certain advantages.
1. Drum granulation is also called drum granulation, and the drum granulator is the most widely used equipment in the type of compound fertilizer production equipment. The main working mode is wet granulation of aggregates. Through a certain amount of water or steam, the basic fertilizer is fully chemically reacted after being humidified in the cylinder. Under a certain liquid phase condition, with the help of the rotating movement of the cylinder, the material particles are squeezed and agglomerated into pellets.
2. The most basic disk granulation
The technological principle of disc granulation is that all raw materials are mixed and then enter the disc for granulation, and the disc makes the materials agglomerate into balls by rotating. Disc granulation is characterized by simple equipment, less investment and fast start-up. The disadvantage of disc granulation is that it is only suitable for small-scale production, with low efficiency. The daily output is only dozens of tons, and the formula is limited. It requires viscous materials, which are only suitable for low concentration.
3. Gunite granulation
Spraying mainly refers to urea spraying, which means that the urea is sprayed to the compound fertilizer granulation unit after melting, reducing the urea crushing link. If the urea pipe is connected to the urea plant, it will save more money. Fertilizer dissolves quickly, and most of them are high nitrogen formula with nitrogen content greater than 20.
4. Ammoniation granulation
The ammoniation granulation compound fertilizer is produced by ammoniation and secondary dechlorination granulation process. The principle is to add potassium chloride and sulfuric acid into the reaction tank for heating and reaction under certain conditions. The escaping HCL gas can be absorbed by water to produce hydrochloric acid of certain concentration. The generated potassium bisulfate is mixed with dilute phosphoric acid to form mixed acid. The mixed acid and synthetic ammonia are reacted in a tubular reactor in proportion to generate compound fertilizer slurry, which is directly sprayed into the drum granulator to generate sulfur based compound fertilizer with a certain proportion of nitrogen, phosphorus and potassium. It has the characteristics of uniform granulation, bright color, stable quality, sufficient nutrients, easy dissolution and absorption by crops. Especially, it is relatively safe for seeds to be used as seed fertilizer.
5. High tower granulation
The high tower is used to change the high temperature molten slurry or molten slurry mixture of compound fertilizer raw materials, which is scattered from high altitude, and the surface tension becomes spherical when it is scattered. Re screening. The particles are not easy to agglomerate because they have little water during the high temperature process. The materials are fully mixed and reflected, and the particles are crystal clear. Good appearance. The reaction materials need high purity and high concentration formula, and the urea ratio is relatively high.
1. Drum granulation is also called drum granulation, and the drum granulator is the most widely used equipment in the type of compound fertilizer production equipment. The main working mode is wet granulation of aggregates. Through a certain amount of water or steam, the basic fertilizer is fully chemically reacted after being humidified in the cylinder. Under a certain liquid phase condition, with the help of the rotating movement of the cylinder, the material particles are squeezed and agglomerated into pellets.
2. The most basic disk granulation
The technological principle of disc granulation is that all raw materials are mixed and then enter the disc for granulation, and the disc makes the materials agglomerate into balls by rotating. Disc granulation is characterized by simple equipment, less investment and fast start-up. The disadvantage of disc granulation is that it is only suitable for small-scale production, with low efficiency. The daily output is only dozens of tons, and the formula is limited. It requires viscous materials, which are only suitable for low concentration.
3. Gunite granulation
Spraying mainly refers to urea spraying, which means that the urea is sprayed to the compound fertilizer granulation unit after melting, reducing the urea crushing link. If the urea pipe is connected to the urea plant, it will save more money. Fertilizer dissolves quickly, and most of them are high nitrogen formula with nitrogen content greater than 20.
4. Ammoniation granulation
The ammoniation granulation compound fertilizer is produced by ammoniation and secondary dechlorination granulation process. The principle is to add potassium chloride and sulfuric acid into the reaction tank for heating and reaction under certain conditions. The escaping HCL gas can be absorbed by water to produce hydrochloric acid of certain concentration. The generated potassium bisulfate is mixed with dilute phosphoric acid to form mixed acid. The mixed acid and synthetic ammonia are reacted in a tubular reactor in proportion to generate compound fertilizer slurry, which is directly sprayed into the drum granulator to generate sulfur based compound fertilizer with a certain proportion of nitrogen, phosphorus and potassium. It has the characteristics of uniform granulation, bright color, stable quality, sufficient nutrients, easy dissolution and absorption by crops. Especially, it is relatively safe for seeds to be used as seed fertilizer.
5. High tower granulation
The high tower is used to change the high temperature molten slurry or molten slurry mixture of compound fertilizer raw materials, which is scattered from high altitude, and the surface tension becomes spherical when it is scattered. Re screening. The particles are not easy to agglomerate because they have little water during the high temperature process. The materials are fully mixed and reflected, and the particles are crystal clear. Good appearance. The reaction materials need high purity and high concentration formula, and the urea ratio is relatively high.
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