Preparation method for acidic fertilizer

A technology of acidic fertilizer and phosphoric acid, applied in ammonium orthophosphate fertilizer, alkaline orthophosphate fertilizer, ammonium salt fertilizer, etc., can solve the problems of high viscosity of granular fertilizer, easy moisture absorption and hardening of products, unfavorable popularization and application, etc., and achieve reduction Effects of volatilization loss, improvement of soil structure and environment, and increase of mobility

Inactive Publication Date: 2018-02-23
菏泽金正大生态工程有限公司 +2
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, this fertilizer is a liquid fertilizer, which is difficult to transport and use, which is not conducive to large-scale promotion and application
[0006] Chinese patent document CN102442864A (application number CN201110286421.1) discloses an acidic fertilizer capable of decomposing phosphorus, potassium and trace elements in soil, which consists of 1-9 parts of sulfuric acid, 1-8 parts of phosphoric acid, 3-16 parts of ammonium sulfate, liquid ammonia 1 to 3 parts of sulfur phosphorus mixed acid ammonium sulfate fertilizer, although effectively reducing the impact of the mineral solid film in the soil, effectively improving the diffusion rate of reactants and products through the solid film, so that the decomposition of phosphorus, potassium and trace amounts Elements are easy to carry out. Sulfuric acid and phosphoric acid are used to decompose ineffective phosphorus, potassium and trace elements in the soil for effective phosphorus, potassium and trace elements required by plant growth. Ammonium sulfate is nitrogen fertilizer, but sulfuric acid mixed acid ammonium sulfate fertilizer contains sulfuric acid. However, the granular fertilizer containing sulfuric acid has a high viscosity and is not easy to dry.
Although the invention reduces the moisture absorption of urea phosphate by compounding with monoammonium phosphate, the granulated product still has problems such as easy moisture absorption and hardening

Method used

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  • Preparation method for acidic fertilizer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] A preparation method of acidic fertilizer, comprising the steps of:

[0045] (1) Phosphoric acid and urea are added to the mixing tank I to control the P in the acid solution 2 o 5 with CO(NH 2 ) 2 The molar ratio is 1:0.7, and the mixture A is obtained after mixing evenly;

[0046] (2) The mixed slurry A obtained in step (1) is pumped into the concentration tank to concentrate at 85°C, and the P 2 o 5 The mass percent content is 36%, and concentrated slurry B is obtained after concentration;

[0047] (3) Pump the slurry B obtained in step (2) into the mixing tank II, add urea to the mixing tank II, and control the P in the acid solution 2 o 5 and total CO(NH 2 ) 2 The molar ratio is 1:1.4, and the mixed slurry C is obtained

[0048] (4) The slurry C obtained in the step (3) is passed into a tubular reactor, sulfuric acid is added, and ammonia gas is passed into to control P 2 o 5 The molar ratio with sulfate is 1:1, pH=2-3.5, temperature 155-165°C, after th...

Embodiment 2

[0052] A preparation method of acidic fertilizer, comprising the steps of:

[0053] (1) Phosphoric acid and urea are added to the mixing tank I to control the P in the acid solution 2 o 5 with CO(NH 2 ) 2 The molar ratio is 1:0.2, and the mixture A is obtained after mixing evenly;

[0054] (2) The mixed slurry A obtained in step (1) is pumped into the concentration tank to concentrate at 85°C, and the P 2 o 5 The mass percentage content is 41%, and concentrated slurry B is obtained after concentration;

[0055] (3) Pump the slurry B obtained in step (2) into the mixing tank II, add urea to the mixing tank II, and control the P in the acid solution 2 o 5 and total CO(NH 2 ) 2 Molar ratio is 1:0.6, obtains mixed slurry C;

[0056] (4) The slurry C obtained in the step (3) is passed into a tubular reactor, sulfuric acid is added, and ammonia gas is passed into to control P 2 o 5 The molar ratio to sulfate is 1:1.7, pH=2-3.5, temperature 170-175°C, after the reaction i...

Embodiment 3

[0060] A preparation method of acidic fertilizer, comprising the steps of:

[0061] (1) Phosphoric acid and urea are added to the mixing tank I to control the P in the acid solution 2 o 5 with CO(NH 2 ) 2 The molar ratio is 1:0.3, and the mixture A is obtained after mixing evenly;

[0062] (2) Pump the mixed slurry A obtained in step (1) into the concentration tank to concentrate at 90°C, and control P 2 o 5 The mass percent content is 41.5%, and concentrated slurry B is obtained after concentration;

[0063] (3) The slurry B obtained in the step (2) is passed into the tubular reactor, sulfuric acid is added, and ammonia gas is passed into to control P 2 o 5 The molar ratio to sulfate is 1:1.5, pH=2-3.5, temperature 160-170°C, after the reaction is complete, slurry C is obtained;

[0064] (4) spray the slurry C obtained in step (3) into the granulator for spray granulation, then transport to the dryer for drying, and then sieve, and the qualified products are packaged ...

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Abstract

The invention relates to a preparation method for an acidic fertilizer. The preparation method comprises the following steps: mixing of phosphoric acid with urea; reaction after completion of mixing;and granulating and drying. The acidic fertilizer provided by the invention comprises urea phosphate and ammonium bisulfate and has a pH value of 2.5 to 3.5, so the pH value of alkaline soil can be reduced, and the volatilization loss of ammonium nitrogen in the alkaline soil is reduced; in addition, the stability of amide nitrogen can be increased, and activation effects can be exerted on phosphorus and medium-trace elements; meanwhile, the phosphorus can be avoided from fixation by elements like calcium and magnesium, and the moving ability of the phosphorus is improved; when the pH value ofthe acidic fertilizer is lower than 2.5, the acidic fertilizer has too great viscosity and is easy to absorb moisture; and when the pH value of the acidic fertilizer is excessively high, the pH valueof soil can not be effectively reduced, and the purpose of activating the phosphorus and the medium-trace elements can not be achieved.

Description

technical field [0001] The invention relates to the field of fertilizers, in particular to a method for preparing acidic fertilizers, and belongs to the technical field of fertilizers. Background technique [0002] In northern my country and coastal areas, there are a large number of alkaline soils with high pH, ​​poor physical and chemical properties of soil, phosphoric acid and calcium or iron, aluminum are easy to form a delayed state, phosphorus availability is reduced, and calcium, magnesium, iron, zinc and The solubility of boron, manganese, copper and other elements is very low, showing the lack of trace elements. Due to the severe phosphorus deficiency in alkaline areas, farmers in alkaline areas use a large amount of monoammonium phosphate and diammonium phosphate, but the utilization rate of phosphorus is very low, resulting in waste of fertilizers and crop yield reduction. [0003] Diammonium phosphate is a binary quick-acting compound fertilizer that contains nit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/04C05G3/80
CPCC05B7/00C05G3/80C05C3/00C05C9/00C05D9/02
Inventor 万连步胡兆平刘永秀于南树陈爱中刘兵郭宗端
Owner 菏泽金正大生态工程有限公司
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