Production method of drying-free compound fertilizer

A technology of compound fertilizer and production method, applied in fertilizer mixture, fertilization device, application, etc., to achieve the effect of white color, flexible adjustment of product formula, and diverse production varieties

Inactive Publication Date: 2014-01-15
PANJIN STRONG FERTILIZER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method cancels the drying system, optimizes the process flow, reduces a large amount of equipment investment, overcomes the shortcomings of the traditional pellet method, such as high energy consumption, rough product appearance, low ball forming rate, and high product cost, and reduces the cost to the greatest extent. , to maximize product quality

Method used

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  • Production method of drying-free compound fertilizer

Examples

Experimental program
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Effect test

Embodiment 1

[0049] Embodiment 1: 17-17-17 Nitrogen Phosphorus Potassium Balanced Product

[0050] 55 kg of concentrated sulfuric acid (mass percentage, the same below) with a concentration of 98% is pumped into the tubular reactor after metering, and 40 kg of gaseous ammonia (containing 82.3% N) is metered and added to the tubular reactor. After the washing water is metered, it is added to the urea melting tank and the metered urea is made into a urea solution with a concentration of about 95% by mass. The temperature of the solution is controlled between 115-125°C. The amount of urea solution added is 0.088 cubic meters, which is converted into 100 kg of solid urea (including N 46.2), and at the same time, 70 kg of urea (including N 46.2), 60 kg of ammonium chloride (including N 25.1), and powdered phosphoric acid Monoammonium (containing N 11%, P2O 545%) 385 kg, potassium chloride (containing K2O 60%) 285 kg, the above-mentioned powdery materials, ammonium sulfate solution and urea solu...

Embodiment 2

[0051] Embodiment 2: 25-13-10 high nitrogen product

[0052] 65 kg of concentrated sulfuric acid (mass percentage, the same below) with a concentration of 98% is pumped into the tubular reactor after metering, and 40 kg of gaseous ammonia (containing 82.3% N) is metered and added to the tubular reactor. After the washing water is metered, it is added to the urea melting tank and the metered urea is made into a urea solution with a concentration of about 95% by mass. The temperature of the solution is controlled between 115-125°C. The amount of urea solution added is 0.132 cubic meters, which is converted into 150 kg of solid urea (including N 46.2). At the same time, 200 kg of urea (including N 46.2), 90 kg of ammonium chloride (including N 25.1) and powdered phosphoric acid are added through computer metering. Monoammonium (containing N 11%, P2O 545%) 290 kg, potassium chloride (containing K2O 60%) 170 kg, the above powder materials are mixed with the ammonium sulfate solutio...

Embodiment 3

[0053] Embodiment 3: 18-10-20 high potassium product

[0054] 70 kg of concentrated sulfuric acid (mass percentage, the same below) with a concentration of 98% is pumped into the tubular reactor after metering, and 45 kg of gaseous ammonia (containing 82.3% N) is metered and added to the tubular reactor. After the washing water is metered, it is added to the urea melting tank and the metered urea is made into a urea solution with a concentration of about 95% by mass. The temperature of the solution is controlled between 115-125°C. The amount of urea solution added is 0.132 cubic meters, which is converted into 150 kg of solid urea (including N 46.2), and at the same time, 30 kg of urea (including N 46.2), 140 kg of ammonium chloride (including N 25.1), and powdered phosphoric acid Monoammonium (containing N 11%, P2O5 45%) 225 kg, potassium chloride (containing K2O 60%) 335 kg, the above powder materials and the ammonium sulfate solution and urea solution sprayed from the tubul...

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Abstract

The invention discloses a production method of a drying-free compound fertilizer, which comprises the following steps: directly preparing concentrated sulfuric acid and ammonia into an ammonium sulfate solution of more than 400 DEG C; melting urea in a urea melting device to obtain a urea solution of which the temperature is 115-125 DEG C and the mass percentage is 95-98%; passing the ammonium sulfate solution through a purpose-made tubular reactor, atomizing and spraying the ammonium sulfate solution and the urea solution with a special sprayer into a granulator, and granulating with other powdery basic fertilizers containing nitrogen, phosphorus and potassium; and after the granulation, directly cooling, screening and coating to obtain the nitrogen-phosphorus-potassium compound fertilizer. The invention fully utilizes ammonia-acid reaction head and temperature of the urea solution to enhance the material temperature, and utilizes the ammonia sulfate solution generated by ammonia-acid reaction and the urea solution as the liquid phase, and has the advantages of high viscosity and high granulation rate. The invention does not need to add vapor and water to increase the water content of the granulated material, cancels the drying system and auxiliary facility, reduces the technical process, and saves about 30% of equipment investment and a great deal of energy consumption.

Description

technical field [0001] The present invention relates to a compound fertilizer production method, in particular to a production process in which chemical raw materials sulfuric acid and ammonia are added to melt part of the urea into a urea solution, and ammonium sulfate solution and urea solution are used as the liquid phase required for granulation. It changed the traditional granulation method that needs to add a large amount of steam and water as the liquid phase required for granulation, and realized the method of making compound fertilizers containing nitrogen, phosphorus and potassium without drying. Background technique [0002] At present, with the development of modern agriculture, the development of compound fertilizers at home and abroad plays a leading role in the chemical fertilizer industry. In the developed countries of the chemical fertilizer industry, the amount of compound fertilizers has accounted for 70% to 80% of the amount of chemical fertilizers. Compo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C05G1/00
Inventor 朱守军
Owner PANJIN STRONG FERTILIZER
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