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Water-soluble fertilizer special for alkaline soil and its preparation method

A soil and water-soluble technology, applied in the direction of fertilizer mixture, application, fertilization device, etc., can solve the problems of not being mass-produced by enterprises, complex process operation, and limited application, etc., to achieve the increase of micronutrient elements, simple process flow, and convenient operation Effect

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
Moreover, it is difficult to deal with the mother liquor in production, 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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  • Water-soluble fertilizer special for alkaline soil and its preparation method
  • Water-soluble fertilizer special for alkaline soil and its preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0042] The specific operation steps are as follows:

[0043] (1) Slowly add urea to the first reaction kettle with 98% sulfuric acid, start stirring, remove the heat of reaction released by the reaction while adding urea, control the slurry temperature in the reaction tank to be less than 100°C, and control the pH value At about 1, stop adding urea to obtain the first raw material urea sulfate slurry;

[0044] (2) Slowly feed ammonia gas into the second reaction kettle added with defluorinated wet-process phosphoric acid, and start stirring at the same time, when controlling the pH value between 4.2-4.6, stop feeding ammonia gas to obtain the second raw material phosphoric acid- Ammonium slurry;

[0045] (3) The raw materials prepared by the (1) step and the (2) step are mixed and compounded in the ratio of 40 parts by weight monoammonium phosphate: 60 parts of urea sulfate, and the proportion of the slurry is controlled between 1.33-1.43kg / L, Then it is input into the spray...

Embodiment 2

[0048] Concrete operation steps of the present invention are as follows:

[0049] (1) Slowly add urea into the first reaction kettle with 88wt% sulfuric acid, start stirring, remove the heat of reaction released by the reaction while adding urea, control the slurry temperature in the reaction tank to be less than 100°C, and control the pH value When about 1, stop adding urea, obtain the first raw material urea sulfate slurry;

[0050] (2) Slowly feed ammonia gas into the second reaction kettle added with defluorinated wet-process phosphoric acid, and start stirring at the same time, when controlling the pH value between 4.2-4.6, stop feeding ammonia gas to obtain the second raw material phosphoric acid- Ammonium slurry;

[0051] (3) The raw materials prepared in (1) step and (2) step are mixed and compounded in the ratio of 50 parts by weight monoammonium phosphate: 50 parts in urea sulfate, and the proportion of slurry is controlled between 1.33-1.43kg / L, Then it is input t...

Embodiment 3

[0054] Concrete operation steps of the present invention are as follows:

[0055] (1) Slowly add urea to the first reaction kettle with 98% sulfuric acid, start stirring, remove the heat of reaction released by the reaction while adding urea, control the slurry temperature in the reaction tank to be less than 100°C, and control the pH value At about 1, stop adding urea to obtain the first raw material urea sulfate slurry;

[0056] (2) Slowly feed ammonia gas into the second reaction kettle added with defluorinated wet-process phosphoric acid, and start stirring at the same time, when controlling the pH value between 4.2-4.6, stop feeding ammonia gas to obtain the second raw material phosphoric acid- Ammonium slurry;

[0057] (3) the raw materials prepared by the (1) step and the (2) step are mixed and compounded in the ratio of 75 parts by weight monoammonium phosphate: 25 parts of urea sulfate, and the proportion of the slurry is controlled between 1.33-1.43kg / L, Then it is...

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Abstract

The invention relates to a water-soluble fertilizer special for alkaline soil and a preparation method of the water-soluble fertilizer special for alkaline soil, in particular to a strong acidic nitrogen phosphorus fertilizer suitable for spray drip irrigation, which belongs to the technical field of fertilizers. The inventive fertilizer has low cost, and convenient storage and transportation, provides a fertilizer source for saline-alkali arid areas in northwestern China such as Xinjiang, is adapted to spray drip irrigation systems in the saline-alkali arid areas, and can amend the alkaline soil. The preparation method comprises mixing monoammonium phosphate 50-95 weight parts, urea sulfate 5-50 weight parts and water to obtain slurry, and then performing spray drying, cooling, and sieving. The prepared fertilizer has low moisture absorption, and employs urea sulfate, which is a nitrogen and sulfur compound fertilizer with strong moisture absorption, in the fertilizer field. The method has simple process, low cost and convenient operation, and can realize large-scale industrial continuous production.

Description

technical field [0001] The invention belongs to the technical field of fertilizers, and in particular relates to a special water-soluble fertilizer for alkaline soil and a preparation method thereof, 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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G1/00
Inventor 李进张海波邹建唐文军王佳才
Owner GUIZHOU CHANHEN CHEM CO LTD
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