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

A spray granulation and compound fertilizer technology, which is applied in the direction of fertilization equipment, fertilizer form, fertilizer mixture, etc., can solve the problems of high insoluble matter, insufficient nitrogen content of sulfur-based compound fertilizer, and inapplicable flushing fertilization, etc., to achieve insoluble matter The effect of less, high nitrogen content, and low cost

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, the sulfur-based compound fertilizer produced by this process contains insufficient nitrogen and contains more insoluble matter, so it is not suitable for flushing fertilization

Method used

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  • Method for producing high-nitrogen sulfur-based water soluble compound fertilizer through slurry-spraying granulation
  • Method for producing high-nitrogen sulfur-based water soluble 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 percent of insoluble matter, 11 to 12 percent of nitrogen, and 2 to 4 mm in particle size of the compound fertilizer, which cannot be used for flushing fertilization.

Embodiment 2

[0022] Embodiment 2 The method of spraying granulation of the present invention to produce high-nitrogen and sulfur-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...

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Abstract

The invention discloses a method for producing high-nitrogen sulfur-based water soluble compound fertilizer through slurry-spraying granulation. Phosphoric acid added to a mixed acid intermediate tank is prepared through steps as follows: firstly, phosphoric acid and ammonia gas are pre-neutralized in anammoniation reactor, and pre-neutralized slurry is obtained; after pH value of part of the pre-neutralized slurry is regulated to be 4.0-4.5, filter residues and a filtrate are obtained through filter pressing; the filter residues and the residual pre-neutralized slurry are sent to a powder ammonium workshop for production ofammonium phosphate; the filtrate is taken as phosphoric acid to be added to the mixed acid intermediate tank and mixed with potassium hydrogen sulfate from apotassium hydrogen reaction tank, and mixed acid is obtained and sent to a tubular reactor for a reaction with introduced ammonia gas. According to the method, most insoluble substances are filtered out through filter pressing, 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, molten urea is added to an oil injection coating system, so that urea can wrap the compound fertilizer surface, the content of nitrogen in the compound fertilizer is effectively increased, and high practicability is realized.

Description

technical field [0001] The invention relates to the production field of compound fertilizers, in particular to a method for producing high-nitrogen and sulfur-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. The market demand for high-nitrogen and sulfur-based compound fertilizers is large. During the production process, ordinary sulfur-based compound fertilizers can be added with urea in the spray tank or sprayed with urea in the coating machine to increase the nitrogen content. But this kind of compound fertilizer is because the water-insoluble matter is h...

Claims

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Application Information

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IPC IPC(8): C05G1/00C05G5/00
CPCC05G1/00C05G5/12C05G5/30
Inventor 韩二民周普松张磊
Owner WUHAN ZHONGDONG PHOSPHATE TECH
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