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Method for producing high-nitrogen water soluble nitro-sulfur compound fertilizer through slurry-spraying granulation

A technology of spraying granulation and compound fertilizer, which is applied in the direction of nitrogen fertilizer, fertilization device, ammonium nitrate fertilizer, etc. It can solve the problems of slow dissolution time, pipeline blockage, and inability to reach flushing fertilization, etc., and achieves less insoluble matter, low cost, The effect of improving the utilization rate

Inactive Publication Date: 2017-06-13
WUHAN ZHONGDONG PHOSPHATE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this kind of compound fertilizer has a high water insoluble matter, reaching about 5%, and the dissolution time is slow. The insoluble matter solution will cause pipeline blockage, which cannot meet the requirements of fertilization.

Method used

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  • Method for producing high-nitrogen water soluble nitro-sulfur compound fertilizer through slurry-spraying granulation
  • Method for producing high-nitrogen water soluble nitro-sulfur compound fertilizer through slurry-spraying granulation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Embodiment 1 Existing spray granulation produces the method for sulfur-based compound fertilizer

[0020] Such as figure 1 As shown, first add sulfuric acid and potassium chloride to the potassium hydrogen reaction tank to react to generate potassium hydrogen sulfate, then add phosphoric acid to the potassium hydrogen sulfate in the middle tank of mixed acid and send it to the tubular reactor to feed ammonia gas for reaction. After the completion, the flash slurry is obtained by flashing through the flash tank, and then the flash slurry is granulated, and the compound fertilizer obtained from the granulation is screened and then enters the oil spray coating system to be coated to obtain the compound fertilizer.

[0021] The compound fertilizer produced according to the method contains more than 5% of insoluble matter, the nitrogen content is within 11-12%, and the particle size of the compound fertilizer is 2-4mm, so it cannot be used for flushing fertilization.

Embodiment 2

[0022] Embodiment 2 The method of spraying granulation of the present invention to produce high-nitrogen nitrate-based compound fertilizer

[0023] Such as figure 2 As shown, the phosphoric acid added to the mixed acid intermediate tank is obtained in the following way:

[0024] Sulfuric acid and potassium chloride are added into the potassium hydrogen reaction tank to react to generate potassium hydrogen sulfate. Then phosphoric acid and ammonia are pre-neutralized in the ammoniation reactor to obtain a pre-neutralized slurry. The temperature of the pre-neutralized slurry is 75-80°C, the pH value is 3.5-4.0, and the density is 1.25-1.28mg / L. Adjust the pH value of one-third of the pre-neutralization slurry to 4.0-4.5, and then obtain the filter residue and filtrate through pressure filtration. The density of the filtrate is 1.20-1.23mg / L, of which P 2 o 5 The content is 19 to 20%. A large amount of insoluble matter in the pre-neutralized slurry has been filtered out in...

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Abstract

The invention discloses a method for producing high-nitrogen water soluble nitro-sulfur compound fertilizer through slurry-spraying granulation. The method comprises steps as follows: firstly, sulfuric acid and potassium chloride are added to a potassium hydrogen reaction tank for a reaction, and potassium hydrogen sulfate is produced; after phosphoric acid is added to a mixed acid intermediate tank, potassium hydrogen sulfate and phosphoric acid are sent to a tubular reactor for a reaction with introduced ammonia gas, flash evaporation slurry is obtained through flash evaporation in a flash tank after the reaction, then the flash evaporation slurry is granulated, compound fertilizer obtained through granulation is sieved and enters an oil injection coating system for coating, and the compound fertilizer is obtained, wherein flash evaporation slurry is sent into a granulator for granulation after addition of ammonium nitrate. According to the method, most insoluble substances are filtered out through filter pressing before acid mixing, so that content of the insoluble substances in the compound fertilizer is reduced, and the compound fertilizer can meet the requirement of the water soluble fertilizer. Meanwhile, ammonium nitrateis proportionally added before granulation, so that nitrate nitrogen meets the national standard, the nitrogen content is easy to control, and the compound fertilizer is not prone to caking and has high practicability.

Description

technical field [0001] The invention relates to the production field of compound fertilizers, in particular to a method for producing high-nitrogen and nitrate-based compound fertilizers by spraying and granulating. Background technique [0002] Traditional sulfur-based compound fertilizers contain a large amount of insoluble matter such as iron, aluminum, magnesium, etc., which cannot meet the standards for flushing fertilization, and the nitrogen content is generally lower than 13%. It can only be used as base fertilizer and cannot be a good substitute for organic fertilizer. Adapt to the development of modern agriculture. High-nitrogen and nitrosulfur-based compound fertilizers have the advantages of fast dissolution and easy absorption and utilization by plants, and the market demand is relatively large. [0003] The compound fertilizer preparation process of the traditional spray granulation process is as follows: figure 1 As shown: it is to add sulfuric acid and pota...

Claims

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Application Information

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IPC IPC(8): C05G3/00
CPCC05B11/10C05G5/12C05G5/30C05C1/00C05D1/02
Inventor 韩二民周普松张磊
Owner WUHAN ZHONGDONG PHOSPHATE TECH
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