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A kind of urea thiophosphate fertilizer and its preparation method and application

A technology of urea thiophosphate and fertilizer, applied in the application, phosphate fertilizer, organic fertilizer and other directions, can solve the problems of easy moisture absorption and hardening, difficult transportation and use, unfavorable promotion and application, etc., and achieve continuous large-scale production, low cost, Simple preparation process

Active Publication Date: 2021-06-18
菏泽金正大生态工程有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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. The fertilizer 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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  • A kind of urea thiophosphate fertilizer and its preparation method and application
  • A kind of urea thiophosphate fertilizer and its preparation method and application
  • A kind of urea thiophosphate fertilizer and its preparation method and application

Examples

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Effect test

Embodiment 1

[0064] A preparation method of urea thiophosphate fertilizer, comprising the steps of:

[0065] (1) First add phosphoric acid to the mixing tank I, and add urea under constant stirring to control the P in the acid solution. 2 o 5 with CO(NH 2 ) 2 The molar ratio is 1:0.4, and the mixed slurry A is obtained after mixing evenly;

[0066] (2) Pump the mixed slurry A obtained in step (1) into the concentration tank, concentrate at 85°C, and control P 2 o 5 The mass percent content is 40%, and the concentrated slurry B is obtained;

[0067] (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 with CO(NH 2 ) 2 Molar ratio is 1:0.6, obtains mixed slurry C;

[0068] (4) Pump the mixed slurry C obtained in the step (3) into the mixing tank III, press the P in the mixed slurry 2 o 5 The content of ammonium sulfate is put into the ammonium sulfate, specifically after the ammonium sulfa...

Embodiment 2

[0073] A preparation method of urea thiophosphate fertilizer, comprising the steps of:

[0074] (1) First add the urea phosphate mother liquor into the mixing tank I, and add phosphoric acid under constant stirring to control the P in the acid solution. 2 o 5 with CO(NH 2 ) 2 The molar ratio is 1:0.9, and the mixed slurry A is obtained after mixing evenly;

[0075] (2) Pump the mixed slurry A obtained in step (1) into the concentration tank, concentrate at 90°C, and control P 2 o 5 The mass percent content is 43%, and concentrated slurry B is obtained after concentration;

[0076] (3) Pump the concentrated slurry B obtained in step (2) into the mixing tank II, press the P in the mixing slurry 2 o 5 The content of ammonium sulfate is put into the ammonium sulfate, specifically after the ammonium sulfate is put in, the P in the mixed slurry 2 o 5 The molar ratio of sulfuric acid and sulfate reaches 1:1.2 to obtain slurry C;

[0077] (4) The slurry C obtained in the ste...

Embodiment 3

[0081] A preparation method of urea thiophosphate fertilizer, comprising the steps of:

[0082] (1) Add phosphoric acid to the mixing tank, then add urea to control the P in the acid solution 2 o 5 with CO(NH 2 ) 2 The molar ratio is 1:0.3, P 2 o 5 The mass percent content is 43.5%; add ammonium sulfate again, press P 2 o 5 The molar ratio of sulfate to ammonium sulfate is 1:1.3, and ammonium sulfate is added;

[0083] (2) the slurry obtained in the step (1) is passed into a tubular reactor, sulfuric acid is added, and ammonia gas is passed into, and the addition of sulfuric acid is controlled to make P 2 o 5 The molar ratio to the total sulfate in the slurry is 1:1.4, pH=2-3.5, temperature 120-130°C, after the reaction is complete, the slurry is obtained;

[0084] (3) Spray the slurry obtained in step (2) into a granulator for spray granulation, then transport it to a dryer for drying, and then sieve it. After crushing, the finished product is returned to the granul...

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Abstract

The invention relates to a urea thiophosphate fertilizer and its preparation method and application. The fertilizer contains the following nutrient content in mass percentage: P 2 o 5 ≥20%, amide nitrogen ≥1%, ammonium nitrogen ≥10%, total N ≥ 12%, S ≥ 5%, and the pH of the fertilizer is 2.5‑4. The preparation method comprises: a step of mixing phosphoric acid, urea, and ammonium sulfate or / and ammonium bisulfate; a reaction step after mixing; a granulation and drying step. The invention is a general-purpose soil improvement fertilizer for alkaline soil, and has the characteristics of high fertilizer efficiency. Experiments on wheat show that the yield can be increased by about 8% compared with the application of diammonium phosphate.

Description

technical field [0001] The invention relates to the field of fertilizers, in particular to a urea thiophosphate fertilizer and its preparation method and application. Background technique [0002] In northern my country and coastal areas, there are a large number of alkaline soils with high pH, ​​poor soil physical and chemical properties, 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 soil areas, farmers use a large amount of diammonium phosphate, but the utilization rate of phosphorus is very low, resulting in waste of fertilizers and reduced crop production. [0003] Diammonium phosphate is a binary quick-acting compound fertilizer that contains nitrogen and phosphorus, two essential nutrients for plant gr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C05G1/00C05G3/00C05G3/80C05G3/90
CPCC05B15/00C05G3/00C05G3/80C05G3/90C05C3/00C05F11/02
Inventor 胡兆平刘永秀张强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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