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Coating slurry for slow release fertilizer and production method thereof

A technology of slow-release fertilizers and production methods, applied in the direction of fertilizer mixtures, fertilization devices, applications, etc., can solve soil environmental problems and other problems, and achieve the effect of simple process and strong technical versatility

Inactive Publication Date: 2013-10-09
YANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the polymer that is difficult to degrade is used as a coating for a long time, it will inevitably bring serious environmental problems to the soil.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0014] 1. Crush 5kg of rice straw, soak in 9kg of water for 2 days, and stir to form a slurry.

[0015] 2. After standing the slurry, it is proposed that the upper layer of wastewater is fully reused as the process water for the next rice straw pulping.

[0016] 3. Add 0.5 kg of polyvinyl alcohol to the thick slurry in the lower layer, and stir it under the environmental conditions of 40-60°C to form a viscous biological slow-release coating liquid.

[0017] 4. Soak 46 kg of prepared urea granules with a diameter of about 1-10 mm in the slow-release coating liquid.

[0018] 5. After air-drying the fertilizer granules wrapped by the slow-release film, the biological slow-release urea fertilizer with rice straw as the matrix of the biological slow-release film is prepared.

[0019] 6. Detection:

[0020] In this fertilizer, rice straw, polyvinyl alcohol, urea and water accounted for 8.9%, 1.0%, 85.0%, 5.1% respectively.

[0021] The slow-release half-life of the fertilizer in...

example 2

[0023] 1. Crush 5kg of rice straw, soak in 9kg of water for 2 days, and stir to form a slurry.

[0024] 2. After standing the slurry, it is proposed that the upper layer of wastewater is fully reused as the process water for the next rice straw pulping.

[0025] 3. Add 0.6kg of polyvinyl alcohol to the thick slurry in the lower layer, and stir it under the environmental conditions of 40-60°C to form a viscous biological slow-release coating liquid.

[0026] 4. Spray the slow-release coating solution on the surface of 45 kg of urea particles with a diameter of about 1-10 mm, so that the surface of the fertilizer particles is coated with a biological slow-release coating.

[0027] 5. After air-drying, the biological slow-release urea fertilizer using rice straw as the biological slow-release film substrate is prepared.

[0028] 6. Detection:

[0029] In the fertilizer, rice straw, polyvinyl alcohol, urea and water accounted for 8.9%, 1.1%, 84.7%, and 5.3%, respectively.

[00...

example 3

[0032] 1. Crush 5kg of rice straw, soak in 9kg of water for 2 days, and stir to form a slurry.

[0033] 2. Stand the slurry, extract the upper layer of waste water and fully reuse it as the process water for the next rice straw pulping.

[0034] 3. Add 0.8kg of polyvinyl alcohol to the thick slurry in the lower layer, and stir it under the environmental conditions of 40-60°C to form a viscous biological slow-release coating liquid.

[0035] 4. Spray the slow-release coating liquid on the surface of 45 kg ammonium bicarbonate particles with a diameter of about 1-10 mm, so that the surface of the fertilizer particles is coated with a biological slow-release coating.

[0036] 5. After air-drying, the biological slow-release ammonium bicarbonate fertilizer using rice stalks as the biological slow-release film matrix is ​​obtained.

[0037] 6. Detection:

[0038] In the fertilizer, rice straw, polyvinyl alcohol, ammonium bicarbonate and water accounted for 8.8%, 1.5%, 84.5%, and ...

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Abstract

The invention discloses coating slurry for a slow release fertilizer and a production method thereof, relating to the technical field of production of slow release fertilizers. The method comprises the following steps of: preparing the rich rice straw resource into concentrated slurry; adding polyvinyl alcohol into the concentrated slurry; and stirring at the temperature of between 40 DEG C and 60 DEG C to obtain viscous coating slurry. In a preparation technology process, supernatant waste liquor above the concentrated slurry is fully recycled in a slurry producing process, is taken as process water for next slurry producing of rice straw and is not discharged, and 'three wastes' such as waste water, waste gas and waste solid are not discharged. The production method has a simple process, and is suitable for large-scale industrial production. A slow release coating film of the prepared biological slow release fertilizer can be fully degraded in the soil environment, so that secondary environmental pollution is avoided. The production method is suitable for preparing a biological slow release fertilizer by using inorganic fertilizers or compound fertilizers.

Description

technical field [0001] The invention belongs to the technical field of fertilizer industry, in particular to the technical field of slow-release fertilizer production. Background technique [0002] Since K.G.C1art and others in the United States synthesized the world's first slow-release urea-formaldehyde fertilizer in 1948, the research and development of slow / controlled-release fertilizers has undergone a diversified development process. Especially in the past 10 years, the research direction and application of slow / controlled release fertilizers have also expanded, mainly in the decomposition process of organic polymer coatings and slow-release fertilizers, new coating materials, synthetic processes and slow / controlled release fertilizers Research on the impact of long-term application on the environment. [0003] In recent years, the production and consumption of slow-release / controlled-release fertilizers at home and abroad have been growing steadily, mainly for non-ag...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C05G3/00
Inventor 刘天晴刘燕
Owner YANGZHOU UNIV
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