Organic matter sustained-release urea and preparation method thereof

A technology of slow-release urea and preparation process, applied in fertilizer mixture, fertilization device, application, etc., can solve the problems of water-soluble resin-coated fertilizer technology not passing, impossible to completely degrade, and degradable time shortened, etc., to achieve a solution Loss and pollution problems, strengthening research and application development, and reducing the effect of agricultural production costs

Inactive Publication Date: 2013-11-20
东营万鑫肥料有限公司
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0003] The advantage of thermosetting resin or thermoplastic resin fertilizer is long release time, but the disadvantages are:
[0004] 1) The material is difficult to degrade in the soil, and it generally takes 50 to 60 years. Long-term application will destroy the physical structure of the soil
Even for so-called degradable resins, the degradable time is limited, and it is impossible to achieve complete degradation
[0005] 2) Most of the production equipment adopts the sugar coating machine in the pharmaceutical industry, that is, the so-called bottom spray fluidiz

Method used

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Examples

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Example Embodiment

[0033] A kind of organic slow-release urea mentioned in the present invention, the technical scheme is to comprise the following composition and make, by weight:

[0034] (1) Total nitrogen content ≥40~46;

[0035] (2) Lignin, calculated as lignosulfonate calcium salt ≥0.3~1.5;

[0036] (3) Methylene diurea, calculated as HCHO ≤0.6;

[0037] (4) PH value 5.0-7.0;

[0038] The preparation technology of above-mentioned organic slow-release urea that the present invention mentions, comprises the following steps:

[0039] 1. Raw material preparation

[0040] (1) Solid raw material

[0041] Small granules of urea and returned seed crystals are sent to the urea intermediate storage tank by the elevator, and the urea is discharged from the flapper valve at the lower part of the storage tank and continuously falls on the conveyor belt of the electronic weighing scale. The urea is metered by the belt scale and then sent into the curtain coating granulation drum with the elevator...

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Abstract

The invention relates to an organic matter sustained-release urea and a preparation method thereof. A technical scheme adopted in the invention is characterized in that the total nitrogen content by weight is 40-46; the content by weight of lignin by calcium lignosulfonate is 0.3-1.5; the content by weight of methylenediurea by HCHO is below 0.6; the pH value is 5.0-7.0; and the preparation method comprises a step (1) of preparing raw materials comprising solid raw materials and liquid raw materials, and a step (2) of carrying out coating granulation. The adsorption sustained-release property of lignin realizes the good maintenance of the effectiveness of chemical fertilizers and the sustained-release of the chemical fertilizers, so the organic matter sustained-release urea is a good organic composite fertilizer material; and the exploitation researches of the lignin realizes the comprehensive utilization of natural high-molecular resources, the treatment of the environment pollution caused by the papermaking industry, the solving of the loss and pollution problems in the use process of common fertilizers, and the provision of a new product for the reduction of the agricultural production cost.

Description

technical field [0001] The invention relates to a slow-release urea and a preparation method, in particular to an organic slow-release urea and a preparation process. Background technique [0002] The official large-scale application of slow-release fertilizers in the domestic market began with the promotion of sulfur-coated urea (SCU) in 2006. At present, all kinds of coated urea are popular in the domestic market: (1) Thermosetting resins: such as epoxy, phenolic, urea-formaldehyde, etc.; (2) Thermoplastic resins: polyethylene, polyvinyl alcohol, etc.; (3) Water-soluble Sexual polymers; [0003] The advantage of thermosetting resin or thermoplastic resin fertilizer is long release time, but the disadvantages are: [0004] 1) The material is difficult to degrade in the soil, and it generally takes 50 to 60 years. Long-term application will destroy the physical structure of the soil. Even for so-called degradable resins, the degradable time is limited, and it is impos...

Claims

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Application Information

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IPC IPC(8): C05G3/08C05G3/90
Inventor 李伟华
Owner 东营万鑫肥料有限公司
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