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Preparation method of strong-acidic water-soluble fertilizer special for alkaline soil

A strong acid water and soil technology, applied in fertilizer mixture, application, fertilization device and other directions, can solve the problems of complex process operation, limited application, not mass-produced by enterprises, etc., and achieve the effect of simple process flow and convenient operation.

Active Publication Date: 2012-06-20
GUIZHOU CHANHEN CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, monoammonium phosphate, potassium dihydrogen phosphate, and urea phosphate compound fertilizers containing P elements usually need to use purified phosphoric acid or thermal phosphoric acid as raw materials to produce water-soluble fertilizers with low water insolubles. mass production
However, wet-process phosphoric acid is used as raw material, because of its high impurities and complicated process operation, the agricultural grade monoammonium phosphate fertilizer produced by reacting with ammonia usually contains 10-15% water-insoluble matter. It is used in drip irrigation systems and will match the nozzles or pipeline
And the production of mother liquor is difficult to handle, and it is also difficult to realize industrialized large-scale continuous production
[0004] In addition, most of the existing water-soluble compound fertilizers containing N, P, and K nutrients are relatively weak in acidity. For example, the pH value of 1% aqueous solution of potassium nitrate is 7.0, and the pH value of 1% aqueous solution of potassium dihydrogen phosphate and monoammonium phosphate is 4.5. Water-soluble fertilizers that are weakly acidic or neutral are difficult to adapt to the alkaline soil in arid areas such as Xinjiang in my country
[0005] The pH value of 1% urea sulfate aqueous solution is 1. Although it is a strong acidic water-soluble nitrogen-sulfur compound fertilizer, it will produce a very significant effect when applied to alkaline soil, but because of its strong hygroscopicity, it is not convenient for storage and transportation, which limits Its application in the field of fertilizer

Method used

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  • Preparation method of strong-acidic water-soluble fertilizer special for alkaline soil
  • Preparation method of strong-acidic water-soluble fertilizer special for alkaline soil

Examples

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Effect test

preparation example Construction

[0032] (1) Preparation of urea sulfate slurry:

[0033] Slowly add urea to 93-98wt% sulfuric acid, stir while adding, and control the temperature of the slurry in the reaction tank at 85-90°C, and stop adding urea when the pH value of the slurry is between 1.0-1.3 to obtain urea sulfate slurry;

[0034] (2) Preparation of powdered monoammonium phosphate:

[0035] (3) The urea sulfate slurry and powder monoammonium phosphate are passed through a liquid-solid mixer to obtain a semi-finished product; wherein the ratio of urea sulfate slurry and powder monoammonium phosphate is 50-95 parts by weight of monoammonium phosphate, and 5-50 parts by weight of urea sulfate ;

[0036] (4) The semi-finished product is dried, crushed and screened to obtain a strong acidic water-soluble fertilizer for alkaline soil.

[0037] As a preferred solution of the present invention, in the above-mentioned solution, the specific gravity of the urea sulfate slurry is controlled to 1.8-2.0kg / L, more ...

Embodiment 1

[0051] The specific operation steps are as follows:

[0052] (1) Slowly add urea into the first reaction kettle with 98% sulfuric acid, start stirring, remove the heat of reaction released by the reaction while adding urea, control the temperature of the slurry in the reaction tank at 85-90°C, and control the temperature of the slurry in the reaction tank. When the material pH value is between 1.0-1.3, stop adding urea, obtain the first raw material urea sulfate slurry, and keep warm for use;

[0053] (2) Slowly feed ammonia into the second reaction kettle with defluorinated wet-process phosphoric acid, and start stirring at the same time. When the pH value is between 4.2-4.6, stop feeding ammonia to obtain monoammonium phosphate slurry , after the slurry is spray-dried to obtain the powdered monoammonium phosphate raw material, wherein the air temperature entering the tower is controlled at 600°C, and the air temperature at the exit of the tower is 150°C;

[0054] (3) After ...

Embodiment 2

[0057] Concrete operation steps of the present invention are as follows:

[0058] (1) Slowly add urea into the first reaction kettle with 98% sulfuric acid, start stirring, remove the heat of reaction released by the reaction while adding urea, control the temperature of the slurry in the reaction tank at 85-90°C, and control the temperature of the slurry in the reaction tank. Material pH value is between 1.0-1.3, stops adding urea, obtains the first raw material urea sulfate slurry, and insulation stand-by;

[0059] (2) Slowly feed ammonia into the second reaction kettle with defluorinated wet-process phosphoric acid, and start stirring at the same time. When the pH value is between 4.2-4.6, stop feeding ammonia to obtain monoammonium phosphate slurry , after the slurry is spray-dried to obtain powdery monoammonium phosphate raw material, wherein the temperature of the air entering the tower is controlled at 500°C, and the air temperature at the exit of the tower is 100°C;

...

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Abstract

The invention relates to a preparation method of a strong-acidic water-soluble fertilizer special for alkaline soil, which belongs to the technical field of fertilizers. The method comprises slowly adding urea into 93-98wt% sulfuric acid under stirring while controlling a temperature of slurry in a reactor at 85-90 DEG C, and stopping adding urea when a pH value of the slurry is 1.0-1.3 to obtainurea sulfate slurry; preparing powdered monoammonium phosphate; mixing the urea sulfate slurry 5-50 weight parts with the powdered monoammonium phosphate 50-95 weight parts via a liquid-solid mixer to obtain a semi-finished product; and drying, crushing, and sieving to obtain the strong-acidic water-soluble fertilizer special for alkaline soil. The inventive fertilizer has low production cost, and convenient storage and transportation.

Description

technical field [0001] The invention belongs to the technical field of fertilizers, in particular to a preparation method of a special water-soluble fertilizer for alkaline soil, in particular to a strong acidic nitrogen-phosphorus fertilizer suitable for spraying and drip irrigation. Background technique [0002] Water-soluble fertilizer is a multi-component compound fertilizer that is completely soluble in water. Usually, it can contain all the nutrients needed for crop growth, such as N, P, and K macronutrients, Ca, Mg, S, and copper and iron. , zinc, boron and other trace elements. People can design the formula of water-soluble fertilizer according to the characteristics of the nutritional requirements for crop growth, and its fertilizer utilization rate is almost 2-3 times that of conventional compound chemical fertilizers. Secondly, it can be quickly dissolved in water, easily absorbed by crops efficiently, and the fertilizer effect is fast. More importantly, it can b...

Claims

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Application Information

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IPC IPC(8): C05G3/04C05G3/80
Inventor 李进张海波邹建唐文军王佳才
Owner GUIZHOU CHANHEN CHEM CO LTD
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