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Method for producing compound mixed fertilizer

A production method and compound fertilizer technology, applied in fertilizer mixture, fertilization device, application, etc., can solve the problems of insufficient material fineness, workshop pollution, waste of manpower, etc., and achieve increased granulation temperature, increased fertilizer output, and improved workshop environment. Improved effect

Inactive Publication Date: 2007-01-24
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 were added in the following quantities: 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 the filler, and granulated after mixing, drying, and sieving , Of which 8 tons of qualified particles per hour enter the packaging process; small particles of 4 tons per hour, directly return to the granulation process to continue granulation; large particles 1 ton per hour, enter the melting tank, add 0.2 tons of water per hour, and use steam It is heated and melted indirectly to become a fertilizer slurry, the slurry concentration is 83.3% by weight, and the temperature of the fertilizer slurry is 90°C. Return the fertilizer slurry to the granulation process at a rate of 1.2 tons / hour, spray it on the surface of other solid fertilizers in the granulator, and continue granulation.

Embodiment 2

[0019] The basic fertilizers were added in the following quantities: 1.5 tons / hour of urea, 1.5 tons / hour of ammonium phosphate, 1.5 tons / hour of potassium chloride, and 5.5 tons / hour of kaolin as the filler. After mixing, granulation, drying, and screening , Among which qualified particles 5 tons / hour, enter the packaging process; small particles 3 tons / hour, directly return to the granulation process to continue granulation; large particles 2 tons / hour, enter the melting tank, add 1.3 tons / hour of water, and use steam It is heated and melted indirectly to become a fertilizer slurry, the slurry concentration is 60% by weight, and the temperature of the fertilizer slurry is 80°C. The fertilizer slurry is returned to the granulation process at an amount of 3.3 tons / hour, and sprayed on the surface of other solid fertilizers in the granulator to continue the granulation.

Embodiment 3

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

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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 method for producing compound fertilizers, in particular, to an improved method of the traditional agglomerate method for producing compound fertilizers. Background technique [0002] At present, the typical production method of agglomerated compound fertilizer is to mix the basic fertilizer raw materials containing nitrogen, phosphorus and potassium, and then send them to the drum granulator for granulation. The granulated materials are directly sent to the drying kiln for drying. Qualified products can be obtained by cooling and screening the materials. [0003] In this method, the material after granulation needs to be screened. The qualified fertilizer particles reaching a certain particle size can be used as product packaging. The particles smaller than the qualified fertilizer particle size are directly returned to the granulation process as the returned material, and the fertilizer larger than the qualified fertilizer parti...

Claims

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Application Information

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Patent Type & Authority Applications(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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