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Production method and apparatus of hollow granular water-soluble fertilizer

A technology of water-soluble fertilizer and production method, which is applied in the direction of fertilization device, alkaline orthophosphate fertilizer, fertilizer form, etc., can solve the problems such as the influence of soil fertility, and achieve the effect of fast dissolution speed

Inactive Publication Date: 2018-03-23
SHANGHAI RES INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method can increase the dissolution rate of granular water-soluble fertilizer to a certain extent, it needs to introduce surfactants and disintegrating agents, and these substances are often non-nutritive substances for plants, which will undoubtedly have a certain impact on soil fertility.

Method used

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  • Production method and apparatus of hollow granular water-soluble fertilizer

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Comparison scheme
Effect test

Embodiment 1

[0034] A method for producing a hollow granular water-soluble fertilizer, the method specifically comprises the following steps:

[0035] 1) Pre-mixing: Add urea and phosphoric acid to the mixer at a molar ratio of 0.9:1, and add potassium salt and micro-fertilizer, and mix at 60°C to prepare a mixed slurry. The mass percentage of potassium salt in the mixed slurry is 9 %, the mass percentage of micro-fertilizer is 1%;

[0036] 2) Foaming reaction: Add the mixed slurry into the foamer, react and foam at 140°C for 5 minutes, and obtain a viscous slurry with a viscosity of 800cp;

[0037] 3) Solidification and granulation: Pour the viscous slurry into the rotary differential nozzle with a nozzle diameter of 0.5mm. The slurry is dispersed into droplets under the action of the nozzle. During the descending process in the container, it exchanges heat with the hot air countercurrently. The phosphoric acid, urea and their intermediate products in the droplets continue to polymerize ...

Embodiment 2

[0045] A method for producing a hollow granular water-soluble fertilizer, the method specifically comprises the following steps:

[0046] 1) Pre-mixing: Add urea and phosphoric acid to the mixer at a molar ratio of 1.5:1, and add potassium salt and micro-fertilizer, and mix at 90°C to prepare a mixed slurry. The mass percentage of potassium salt in the mixed slurry is 29 %, the mass percentage of micro-fertilizer is 1%;

[0047] 2) Foaming reaction: Add the mixed slurry into the foamer, react and foam at 100°C for 15 minutes, and the linear velocity of the end point of the agitator in the foamer is 5m / s to obtain a viscous slurry with a viscosity of 500cp;

[0048] 3) Solidification and granulation: Pour the viscous slurry into the rotary differential nozzle with a nozzle diameter of 2.0mm. The slurry is dispersed into droplets under the action of the nozzle. During the descending process in the container, it exchanges heat with the hot air countercurrently. The phosphoric ac...

Embodiment 3

[0051] A method for producing a hollow granular water-soluble fertilizer, the method specifically comprises the following steps:

[0052] 1) Pre-mixing: Add urea and phosphoric acid to the mixer at a molar ratio of 1.1:1, and add potassium salt and micro-fertilizer, and mix at 65°C to prepare a mixed slurry. The mass percentage of potassium salt in the mixed slurry is 13.5 %, the mass percentage of micro-fertilizer is 0.5%;

[0053] 2) Foaming reaction: Add the mixed slurry into the foamer, react and foam at 130°C for 7 minutes, and obtain a viscous slurry with a viscosity of 1000cp;

[0054] 3) Solidification and granulation: Pour the viscous slurry into the rotary differential nozzle with a nozzle diameter of 0.8mm. The slurry is dispersed into droplets under the action of the nozzle. During the descending process in the container, it exchanges heat with the hot air countercurrently. The phosphoric acid, urea and their intermediate products in the droplets continue to polym...

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Abstract

The invention relates to a production method and apparatus of hollow granular water-soluble fertilizer. The production method comprises the following steps: adding phosphoric acid, urea, potassium salt and micro fertilizer into a mixer, and preparing mixed slurry; then adding the mixed slurry in a foaming device, reacting and foaming, obtaining viscous slurry, pumping the viscous slurry into a rotary differential spray head, scattering the slurry into liquid drops by virtue of the spray head, enabling the liquid drops to drop in a solidifying device, thermally polymerizing and solidifying intohollow particles, and subsequently cooling and screening to obtain a final product. The apparatus comprises a urea transport unit, a phosphoric acid transport unit and a potassium salt transport unit, as well as a mixer, a foaming device, a solidifying device, an exhaust gas treatment unit and an after-treatment unit which are communicated with the units. By adopting the production method, additional foaming agent and instant-soluble additives are not needed, carbon dioxide gas generated during the reaction is fixed inside the granular water-soluble fertilizer to change the internal physicalstructure of the granular water-soluble fertilizer product so as to achieve an instant soluble effect, the hollow granular water soluble fertilizer meeting different technological requirements can beacquired, the product is unlikely in moisture absorption and caking, and the dissolving rate is increased.

Description

technical field [0001] The invention belongs to the technical field of water-soluble fertilizer preparation, and in particular relates to a production method of hollow granular water-soluble fertilizer. Background technique [0002] Water-soluble fertilizer is a multi-element compound fertilizer that can be quickly and completely dissolved in water. It is easily absorbed by crops and has a relatively high nutrient utilization rate. It can be applied to facility agriculture such as sprinkler irrigation and drip irrigation to realize the integration of water and fertilizer. The efficiency of saving fertilizer, labor and increasing production. Water-soluble fertilizers can be divided into drip irrigation fertilizers, flushing fertilizers, and foliar fertilizers according to the fertilization method. Compared with flushing fertilization, drip irrigation fertilizers have lower water-insoluble impurities. According to the form, it can be divided into water type (clear liquid type...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G1/00C05G5/00
CPCC05B7/00C05G5/12C05B17/00C05C5/02C05C9/00C05D1/02C05D5/00C05D9/02
Inventor 吴文华梁济李接励袁宸陈明良
Owner SHANGHAI RES INST OF CHEM IND
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