Monoammonium phosphate suspension fertilizer containing medium trace elements, and preparation method thereof

A technology of medium and trace elements and monoammonium phosphate, which is applied in the direction of ammonium orthophosphate fertilizer, alkaline orthophosphate fertilizer, phosphate fertilizer, etc., and can solve the problem of high cost of raw material compounding, solid-liquid separation of suspended fertilizer, crystal growth and agglomeration, etc. problem, achieve the effect of avoiding caking and layering problems, stimulating plant physiological metabolism, and being resistant to storage and transportation

Inactive Publication Date: 2020-09-15
SICHUAN UNIV
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AI Technical Summary

Problems solved by technology

However, this type of suspension fertilizer product itself is a supersaturated liquid, which is in an unstable state and is prepared by blending. It is easily affected by external force, temperature, pH, etc. for long-term storage. liquid separation
Moreover, the price of raw material compounding is high, and trace elements are also added by the outer edge chelate, which greatly increases the cost
The unstable system of physical compounding is still easy to agglomerate after long-term storage, causing large particles to sink to the bottom of the water during the integrated fertilization process, making it difficult to disperse evenly through stirring, and even block the pipeline
This defect is especially obvious in high concentration suspension fertilizer

Method used

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  • Monoammonium phosphate suspension fertilizer containing medium trace elements, and preparation method thereof
  • Monoammonium phosphate suspension fertilizer containing medium trace elements, and preparation method thereof

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preparation example Construction

[0032] The preparation method of the monoammonium phosphate suspension fertilizer containing medium and trace elements of the present invention comprises the steps:

[0033] a. Chelating reaction: mix concentrated phosphoric acid with chelating agent and suspending agent, heat up to 50-120°C and stir for 30-60 minutes to obtain a chelated solution; wherein, the concentrated phosphoric acid contains medium and trace elements;

[0034] b. Ammonification reaction: Ammonia gas is introduced into the solution after chelation until the pH value is 4.0-5.5, and the reaction is performed at a constant temperature of 80-120°C for 20-60 minutes to obtain a high-temperature monoammonium phosphate feed solution containing medium and trace elements;

[0035] c. Cooling molding: the high-temperature monoammonium phosphate feed liquid containing medium and trace elements is cooled to obtain the monoammonium phosphate suspension fertilizer containing medium and trace elements.

[0036] The pr...

Embodiment 1

[0058] The following method is used to prepare the monoammonium phosphate suspension fertilizer containing medium and trace elements and high solid content:

[0059]a. Chelating reaction: the concentrated wet-process phosphoric acid raw material, whose composition is shown in Table 1-1, is heated up to 80°C, and citric acid is added to it according to the content of trace elements in the concentrated wet-process phosphoric acid, and the addition amount is 2.0 times the theoretical amount, then add carboxymethyl cellulose to the solution, the amount added is 0.03% of the concentrated phosphoric acid, and stir at 80°C for 30 minutes;

[0060] b. Ammonification reaction: Ammonia gas is passed into the solution mixed uniformly in step a until the pH value is 4.5, and the reaction is held at a constant temperature of 100°C for 40 minutes, and a high-concentration monoammonium phosphate solution containing trace element nutrients in a chelated state is obtained at a high temperature ...

Embodiment 2

[0068] The following method is used to prepare the monoammonium phosphate suspension fertilizer containing medium and trace elements and high solid content:

[0069] a. Chelating reaction: the concentrated wet-process phosphoric acid raw material, whose composition is shown in Table 2-1, is heated up to 100°C, and EDTA is added to it according to the content of trace elements in the concentrated wet-process phosphoric acid, and the addition amount is theoretical 1.0 times of the dosage, then add carboxymethyl cellulose to the solution after chelation, the addition amount is 0.03% of the concentrated phosphoric acid, stir at 80°C for 30min;

[0070] b. Ammonification reaction: Introduce ammonia gas into the solution mixed uniformly in step a until the pH value is 4.6, stay at a constant temperature at 100°C for 40 minutes, and obtain a high-concentration monoammonium phosphate solution containing trace element nutrients in a chelated state at a high temperature ;

[0071] c. C...

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Abstract

The invention relates to a monoammonium phosphate suspension fertilizer containing medium trace elements, and a preparation method thereof, and belongs to the technical field of fertilizers. The technical problem to be solved by the invention is to provide the preparation method of the monoammonium phosphate suspension fertilizer containing medium trace elements. Concentrated phosphoric acid is adopted as a raw material, a suspending agent is added during chelating, and ammoniation and cooling molding are performed to obtain the product. By adopting an in-situ chelation and suspension technology, the drying process is reduced, the product is stable and uniform, long-term transportation and storage can be ensured, the problems of caking and layering are avoided, and the use is convenient.Additives required by a reaction are small in dosage and low in cost. The solid content of the prepared product can reach 80% or above, the product has good rheological property and high nutrient content, the advantages of chelated medium and trace elements and full water solubility are reserved, meanwhile, spray drying equipment and energy consumption are avoided, the final stability is good, andthe product does not have large particle aggregation and sedimentation after being placed for 6 months or above and is resistant to storage and transportation.

Description

technical field [0001] The invention relates to a monoammonium phosphate suspension fertilizer containing medium and trace elements and a preparation method thereof, belonging to the technical field of fertilizers. Background technique [0002] With the rapid development of water-fertilizer integration technology, the advantages of liquid fertilizer products are increasing year by year, and the development trend of fully instant, compound, liquefied, and concentrated fertilizers is becoming more and more obvious. The composition of liquid fertilizer is uniform, has high nutrient activity, flexible formula, easy to use, has a wide range of raw material sources, simple production and many other advantages, and has been well received by the majority of users. At present, liquid fertilizers include clear liquid type and suspension type. Industrial grade monoammonium phosphate (MAP) is a basic raw material of high-quality macroelement water-soluble fertilizer. It has been widely...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05B7/00C05G5/27C05G3/00
CPCC05B7/00C05G3/00C05G5/27
Inventor 王辛龙周小厚许德华许德军张志业杨林钟本和
Owner SICHUAN UNIV
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