Production method of urea-based composite fertilizer

A urea-based compound fertilizer and fertilizer technology, which is applied in the field of urea-based compound fertilizer production, can solve the problems that the quality of compound fertilizer products cannot be completely guaranteed, the growth of crops is harmful, and the energy consumption of steam is increased, so as to save steam consumption and generate The effect of low air volume and reduction of hot air load

Inactive Publication Date: 2017-01-04
孙建和
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A method for directly producing nitrogen, phosphorus and potassium compound fertilizers by using urea solution. The process uses urea solution with a concentration of 65.0-99.7% and a temperature of 80-140°C from the urea manufacturer, and sprays it into a granulator to reunite with other basic fertilizers. Granulation, this process makes reasonable use of the urea solution produced by the urea plant and increases the granulation temperature, but this process is more suitable for manufacturers with urea plants, so it has certain limitations
In addition, there is also a urea melting process, that is, solid

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Add 162 kilograms of urea (containing N46%), 79 kilograms of concentrated sulfuric acid (98%), and 8 kilograms of water into the preparation tank with agitator at the same time, and pay close attention to the temperature change of the preparation tank during the addition process. Circulating water controls the reaction temperature at 60-80°C. After about 40 minutes, the reaction is completed and a clear urea sulfate solution is produced.

[0048] The urea sulfate solution prepared above was uniformly mixed with 63.7 kg of concentrated sulfuric acid (98%) in a mixer, and sprayed into the granulator through a nozzle after mixing.

[0049] There is powdered ammonium phosphate (containing N 11%, P 2 o5 44%) 341 kg, potassium chloride (containing K 2 (2 60%) 250 kilograms, 64 kilograms of bentonites, open the ammonia injection shaft (or ammonia injection pipe) liquid ammonia valve simultaneously, spray 46 kilograms of liquid ammonia in the granulator.

[0050] After about...

Embodiment 2

[0054] Add 383 kilograms of urea (containing N46%), 188 kilograms of concentrated sulfuric acid (93%), and 18.4 kilograms of water into the preparation tank with agitator at the same time. During the addition process, pay close attention to the change of the temperature of the preparation tank. Circulating water controls the reaction temperature at 60-80°C. After about 20 minutes, the reaction is completed and a clear urea sulfate solution is generated.

[0055] The urea sulfate solution prepared above is sprayed into the granulator through a nozzle.

[0056] At the same time, 29.1 kg of liquid ammonia, 14.8 kg of concentrated sulfuric acid (93%), and 210.5 kg of phosphoric acid (containing P 2 o 5 47.5%, water 23.4%) are metered and transported to the tubular reactor, and sprayed into the granulator after reaction.

[0057] Potassium chloride (containing K 2 (260%) 167 kilograms, open the ammonia injection shaft (or ammonia injection pipe) liquefied ammonia valve simultane...

Embodiment 3

[0062] Add 383 kilograms of urea (containing N46%), 188 kilograms of concentrated sulfuric acid (93%), and 18.4 kilograms of water into the preparation tank with agitator at the same time. During the addition process, pay close attention to the change of the temperature of the preparation tank. Circulating water controls the reaction temperature at 60-80°C. After about 20 minutes, the reaction is completed and a clear urea sulfate solution is produced.

[0063] The urea sulfate solution prepared above is sprayed into the granulator through a nozzle.

[0064] At the same time, 29.1 kg of liquid ammonia, 210.5 kg of phosphoric acid (including P 2 o 5 47.5%, water 23.4%) are metered and transported to the neutralization tank, and sprayed into the granulator after reaction.

[0065] Potassium chloride (containing K 2 (260%) 167 kilograms, open the ammonia injection shaft (or ammonia injection pipe) liquefied ammonia valve simultaneously, spray 61.0 kilograms of liquefied ammoni...

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Abstract

The invention relates to a production method of a urea-based nitrogen-phosphorus-potassium composite fertilizer. The production method comprises the following steps: carrying out a reaction among urea and sulfuric acid and water according to a certain ratio so as to generate a urea sulfate solution; sending the urea sulfate solution into a pelletizer, and carrying out a neutralization reaction between the urea sulfate solution and ammonia introduced into the pelletizer, pelletizing the reaction product and other basal fertilizers containing nitrogen, phosphorus and potassium in the pelletizer, drying, screening, cooling and packaging to obtain the final qualified product. By reasonable utilization of various kinds of reaction heat, energy consumption of production is greatly reduced. As the reaction for generation of urea sulfate is carried out at low temperature (60-80 DEG C), hydrolysis and condensation reaction of urea are less. Then, content of biuret of the final product is very low. Product quality can be fundamentally guaranteed. The technology is simple, and production cost is lower. The production method is easy to apply to existing composite fertilizer production equipment.

Description

technical field [0001] The present invention relates to a kind of production method of compound fertilizer, relate to a kind of production method of urea-based compound fertilizer more precisely. Background technique [0002] As the solid fertilizer with the highest nitrogen content, urea has been used in crops for a long time, but for a long time, due to the special properties of urea, when it is co-granulated with other basic fertilizers to produce compound fertilizer, the product is easy to absorb moisture, which is difficult for granulation and post-treatment. Especially in summer production, due to high temperature and high humidity, the granulation loop is easy to get humidified, scarred and blocked, resulting in poor production. [0003] The traditional production process of urea-based compound fertilizer is to crush urea and other basic fertilizers separately and add them to the granulation system to agglomerate them into granules. Although this process is simple, du...

Claims

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Application Information

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IPC IPC(8): C05G1/00
Inventor 孙建和
Owner 孙建和
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