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Method for producing granular compound fertilizer through coating and pelletizing

A compound fertilizer, compound fertilizer technology, applied in fertilizer mixture, fertilization device, application and other directions, can solve the problems of less than 100% qualified rate of export materials, high maintenance cost of extrusion equipment, rough surface of particles, etc. Improved production environment, improved surface finish, and uniform particle size

Inactive Publication Date: 2019-05-14
SHANGHAI RES INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is simple in process and high in particle strength. The disadvantages are: irregular product particles, rough particle surface, and high maintenance costs for extrusion equipment.
However, since the pass rate of the export materials of this patent is less than 100%, cumbersome procedures such as screening and large particle crushing are required, and the operation is complicated and the equipment investment is high.

Method used

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  • Method for producing granular compound fertilizer through coating and pelletizing

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0031] (2) Preparation of nucleus:

[0032] Nuclei are produced in stirring granulators, drum granulators, disc granulators, extrusion granulators, tower granulators or other equipment. Under suitable moisture conditions, granular materials with a particle size range of 0.5-4 mm can be obtained. The narrower the particle size distribution range of the particles, the more uniform the size, and the more uniform the particle size of the material at the outlet of the subsequent coating machine. Or can directly use granular urea, granular ammonium nitrate or ammonium nitrate phosphorus, granular ammonium phosphate, etc. in the raw material as the particle nucleus; or sieve a certain granular raw material, and take some particles with uniform particle size as the particle nucleus to achieve better Effect.

[0033] (3) Batch coating granulation

[0034] The coating and granulation process is carried out in the coating machine, and the mode of batch operation is adopted. The struct...

Embodiment 1

[0038] refer to figure 1 The shown production process, the fertilizer formula is shown in Table 1, the percentages of raw materials in the table are all mass percentages, product specifications: N-P 2 o 5 -K 2 O=15-15-15, product particle size 3-4.5mm. Batch loading capacity of coating machine: 1.5 tons.

[0039] Table 1. Raw material formula one

[0040] serial number

Types of basic fertilizers and fillers

Raw material addition per ton of product (kg)

1

Urea (N: 46%)

100

2

Ammonium chloride (N: 24%)

282

3

Monoammonium Phosphate (N: 11%P 2 o 5 : 44%)

344

4

Potassium Chloride (K 2 O>60%)

253

5

Kaolin

37

[0041] Use a stirring granulator to produce granules according to the ratio in Table 1. The particle size range of the granules is 1-2mm, no drying is required, and the required amount of batch granules is 0.1 tons; then all raw materials are measured according to the proportion an...

Embodiment 2

[0044] refer to figure 1 Shown production technological process, fertilizer formulation is shown in Table 1 with embodiment 1, product specification: N-P 2 o 5 -K 2 O=15-15-15, product particle size 3-4.5mm. Batch loading capacity of coating machine: 1.5 tons.

[0045] All the small particles of urea in the raw materials are used as particle nuclei, and the particle size of urea is 0.85-2.8mm. The rest of the raw materials other than urea are crushed to a fineness below 100 mesh as powdery raw materials; the amount of urea added in batches is 0.15 tons, The total amount of other powdery raw materials added: 1.35 tons. The powdered raw materials are added in 20 times, and a certain amount of water is added for every 67.5 kg of powdered raw materials added. The interval between powder additions is about 2 minutes, and the total amount of water added is 20-60 kg.

[0046] The powdered raw materials can be mixed and added in 20 times, or can be added into the coating machine ...

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Abstract

The invention relates to a method for producing a granular compound fertilizer through coating and pelletizing. The method comprises the following steps: producing granule cores from a part of a compound fertilizer raw material, or by taking a granule raw material of a compound fertilizer as granule cores, crushing the part of the compound fertilizer raw material to be less than 100 meshes, completely putting the granule cores into a coating machine in an amount of one-batch production, uniformly putting a powder raw material into the coating machine for multiple times, dispersing the powder raw material to the surfaces of the granule cores under the dispersion action of a rolling bed in the coating machine when the powder raw material is added each time, adding aids to enable the powder raw material to be solidly stuck to the surfaces of the granule cores, after one cycle, sequentially adding the powder raw material and the aids, and repeating the process to increase granules in a generally accordant granule increase tendency gradually; and after material addition is completed, continuously rolling for a while, discharging, and carrying out procedures such as drying and cooling ongranules of qualified particle sizes, thereby obtaining a finished product of the compound fertilizer. Pelletized materials are all granules of qualified particle sizes, and the produced granules areuniform in particle size and smooth in surface.

Description

technical field [0001] The invention relates to a production method of compound fertilizer, in particular to a method for producing granular compound fertilizer by batch coating and granulation. Background technique [0002] At present, there are roughly three granulation methods for compound fertilizers: extrusion method, pellet method and slurry method. [0003] The extrusion granulation method has a simple process, relying on the action of mechanical extrusion to extrude the powdery compound fertilizer raw materials into granules, strips or flakes, most of which do not require drying, cooling and other processes. The method has simple process and high granule strength, but has the disadvantages of irregular product granules, rough surface of granules, and high maintenance cost of extrusion equipment. [0004] The granulation method is currently the most commonly used method for compound fertilizer granulation. The granulation method adjusts the moisture and temperature ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/00C05G1/00
Inventor 段立松杨焕银孟亚利何新光何耀张伟
Owner SHANGHAI RES INST OF CHEM IND
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