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Additive for compound fertilizer

A technology of compound fertilizers and additives, applied in fertilizer mixtures, ammonium orthophosphate fertilizers, alkaline orthophosphate fertilizers, etc., can solve problems such as restricting market promotion, achieve cost saving, preparation and promotion of plant nutrient absorption, good water solubility sexual effect

Inactive Publication Date: 2019-11-15
YIDU XINGFA CHEM COMPANY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the current market is also promoting functional fertilizers, that is, adding functional additives to traditional compound fertilizers, so that they can not only provide nutrients, but also promote the growth of plants or regulate soil and other functions. However, the cost is restricting this. The most important factor in the market promotion of quasi-fertilizers

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A method of using industrial waste phosphoric acid and urea to synthesize additives and apply them to compound fertilizers. The raw materials used in this example are raffinate 800g (density 1.70g / ml, acid concentration 46%, solid content 1.7%), agricultural solid urea 225g (nitrogen content ≥ 46.4%), mixed and stirred in a closed container with a material molar ratio (phosphoric acid: urea = 1: 1), controlled reaction temperature 70°C, stirring rate 200r / min, reaction time 50min. The reaction finishes and obtains liquid additive 1, (mass 1025g, N14.8%, P 2 o 5 39%, water content 15%), the temperature of the liquid is controlled at 50°C, and the viscosity is 16cP. During the compound fertilizer drum granulation process, it is evenly sprayed on the surface of the solid material for coating and bonding as it passes through the nozzle in the granulator. For granulation, the amount added is set at 10% of the total mass of the compound fertilizer according to its viscosity....

Embodiment 2

[0026] A method of using industrial waste phosphoric acid and urea to synthesize additives and apply them to compound fertilizers. The raw materials used in this example are 800g of slag acid (density 1.36g / ml, acid concentration 26%, solid content 3.5%), agricultural solid urea 140g (nitrogen content ≥ 46.4%), material molar ratio (phosphoric acid: urea = 1: 1.1), mixed and stirred in a closed container, controlled reaction temperature 70 ° C, stirring rate 200r / min, reaction time 50min. Reaction finishes and obtains liquid additive 1, (total mass 940g, N7.6%, P 2 o 5 32.06%, water content 18%), the temperature of the liquid is controlled at 50°C, and the viscosity is 2cP. During the compound fertilizer drum granulation process, it is evenly sprayed on the surface of the solid material for coating and bonding as it passes through the nozzle in the granulator. For granulation, the amount added is set at 10% of the total mass of the compound fertilizer according to its viscosi...

Embodiment 3

[0028] A method of using industrial waste phosphoric acid and urea to synthesize additives and apply them to compound fertilizers. The raw materials used in this example are 400g raffinate acid (density 1.70g / ml, acid concentration 46%, solid content 1.7%), and slag acid 400g (density 1.36g / ml, acid concentration 26%, solid content 3.5%), agricultural solid urea 176g (nitrogen content ≥ 46.4%), material molar ratio (phosphoric acid: urea = 1: 1) mixed and stirred in a closed container , control the reaction temperature to 70°C, the stirring speed to 200r / min, and the reaction time to 50min. The reaction finishes and obtains liquid additive 1, (mass 976g, N11.6%, P 2 o 5 36.3%, water content 16.7%), the temperature of the liquid is controlled at 50°C, and the viscosity is 16cP. During the compound fertilizer drum granulation process, it is evenly sprayed on the surface of the solid material for coating and bonding as it passes through the nozzle in the granulator. For granula...

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Abstract

The invention discloses an additive for a compound fertilizer. The additive is obtained by reacting waste phosphoric acid, produced in wet process synthesis and refining technologies of phosphoric acid, with urea. The industrial waste phosphoric acid comprises a raffinate acid and a residue acid; the density of the raffinate acid is 1.63-1.70 g / ml, the phosphoric acid concentration is 44-47%, andthe solid content is 1.3-3.5%; and the density of the residue acid is 1.25-1.45 g / ml, the phosphoric acid concentration is 18-28%, and the solid content is 1.0-5.5%. The reaction process of the product is simple, and the original production process of the compound fertilizer is not changed greatly; the chemical production waste acid is used sufficiently, so the cost of raw materials is saved; thesynthesized additive contains nitrogen and phosphorus, and can be used as a part of the compound fertilizer; and the additive has a certain viscosity and a good water solubility, and can promote the preparation of the compound fertilizer and the nutrient absorption of plants.

Description

technical field [0001] The invention relates to a method for synthesizing additives by using industrial waste phosphoric acid and urea and applying them to compound fertilizers, which belongs to the comprehensive utilization of industrial waste and provides a new idea for the application of compound fertilizer additives. Background technique [0002] Phosphorus chemical enterprises often produce a large amount of waste phosphoric acid during production, some of which cannot be directly returned to the system for reuse. In addition, the current market is also promoting functional fertilizers, that is, adding functional additives to traditional compound fertilizers, so that they can not only provide nutrients, but also promote the growth of plants or regulate soil and other functions. However, the cost is restricting this. The most important factor in the market promotion of similar fertilizers. In summary, using cheaper raw materials and simple processes to create higher val...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05B15/00C05B7/00C05G1/00
CPCC05B15/00C05B7/00
Inventor 黄钻郑光明沈维云汪凤玲吴柏林蔡晓宇尹万伟
Owner YIDU XINGFA CHEM COMPANY