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Method for producing compound mixed fertilizer

A production method and technology for compounding fertilizers, which are applied in fertilizer mixtures, fertilization devices, applications, etc., can solve the problems of insufficient material fineness, waste of manpower, workshop pollution, etc., and achieve increased fertilizer output, improved workshop environment, and improved granulation. effect of temperature

Inactive Publication Date: 2009-07-15
SHANGHAI RES INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The large particle crushing has the following disadvantages: First, due to the lack of effective equipment for large particle mechanical crushing, the crushing effect is not good, and the fineness of the crushed materials is not enough, resulting in a large number of returned materials circulating in the system, and some are slightly crushed The large particles are likely to enter the finished product after being circulated through the system, because these particles are generally not very round, which affects the appearance of the product; second, the cleaning of the crusher is often cumbersome, which wastes a lot of manpower, and even causes parking, affecting the stability of the system ; Third, the dust and noise produced by the crusher are not easy to handle, causing workshop pollution and affecting the health of workers

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The basic fertilizers are added in the following quantities respectively, 3.5 tons / hour of urea, 5.0 tons / hour of ammonium phosphate, 3.0 tons / hour of potassium chloride, 1.5 tons / hour of kaolin as filler, granulate after mixing evenly, dry, and sieve , of which 8 tons / hour of qualified particles enter the packaging process; 4 tons / hour of small particles directly return to the granulation process to continue granulation; 1 ton / hour of large particles enter the melting tank, add 0.2 tons / hour of water, and use steam Indirect heating and melting to become fertilizer slurry, the slurry concentration is 83.3% by weight, and the temperature of the fertilizer slurry is 90°C. The fertilizer slurry is returned to the granulation process with an amount of 1.2 tons / hour, sprayed on the surface of other solid fertilizers in the granulator, and continues to granulate.

Embodiment 2

[0019] The basic fertilizers are added in the following quantities, urea 1.5 tons / hour, ammonium phosphate 1.5 tons / hour, potassium chloride 1.5 tons / hour, filling material kaolin 5.5 tons / hour, granulate after mixing evenly, dry, and sieve , of which 5 tons / hour of qualified particles enter the packaging process; 3 tons / hour of small particles directly return to the granulation process to continue granulation; 2 tons / hour of large particles enter the melting tank, add 1.3 tons / hour of water, and use steam Indirect heating and melting to become fertilizer slurry, the concentration of the slurry is 60% by weight, and the temperature of the fertilizer slurry is 80°C. The fertilizer slurry is returned to the granulation process with an amount of 3.3 tons / hour, sprayed on the surface of other solid fertilizers in the granulator, and continues to granulate.

Embodiment 3

[0021] The basic fertilizers are added in the following quantities respectively, 5.0 tons / hour of urea, 2.0 tons / hour of heavy superphosphate, 2.0 tons / hour of potassium sulfate, and 1.0 tons / hour of bentonite. After mixing evenly, granulate, dry, sieve, and small particles 1.1 tons / hour, directly return to the granulation process to continue granulation; 3.9 tons / hour of large particles, enter the melting tank, add water 0.02 tons / hour, use steam to indirectly heat and melt, and become fertilizer slurry with a slurry concentration of 99.9% by weight %, the temperature of the fertilizer slurry is 110°C. The fertilizer slurry is returned to the granulation process with an amount of 3.92 tons / hour, sprayed on the surface of other solid fertilizers in the granulator, and continues to granulate.

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Abstract

The process of producing compound mixed fertilizer includes the steps of metering basic fertilizers, mixing, pelletizing, drying, sieving, sieving, cooling and packing. The production process features that the sieved large fertilizer grains are heated to form suspended fertilizer slurry, rather than crushed, before being returned to the pelletizing step for further pelletizing together with other basic fertilizers. The present invention results in obviously improved production environment and raised fertilizer product quality.

Description

technical field [0001] The invention relates to a production method of a compound fertilizer, in particular to an improved method for producing the compound fertilizer by the traditional pellet method. Background technique [0002] At present, the typical production method of compound fertilizer by granulation method is to mix basic fertilizer raw materials containing nitrogen, phosphorus and potassium, and send them to a drum granulator for granulation. The granulated materials are directly sent to a drying kiln for drying. After drying, The materials are cooled and screened to obtain qualified products. [0003] In this method, the material after granulation needs to be screened, and qualified fertilizer particles with a certain particle size can be used as product packaging. Large particles must be crushed before being returned to the granulation process. The large particle crushing has the following disadvantages: First, due to the lack of effective equipment for large...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C05G1/00
Inventor 段立松杨焕银朱东明
Owner SHANGHAI RES INST OF CHEM IND
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