Preparation method of double-control slow release multi-element coating composite fertilizer

A technology of controlled slow-release and compound fertilizer, applied in fertilization devices, fertilizer mixtures, applications, etc., can solve the problems of secondary pollution, high cost, and high technical requirements for fertilization, and achieve the effect of prolonging fertilizer efficiency period and improving fertilizer utilization rate.

Inactive Publication Date: 2015-05-13
SINO AGRI SHUNTIAN ECOLOGICAL FERTILIZER CO LTD
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0004] In the current production and use of the above related synergistic technologies, there are mainly related problems such as secondary pollution of the environment, affecting soil pH, complex process equipment, high fertilization technology requirements and high costs.

Method used

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Experimental program
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Embodiment Construction

[0019] The preparation method of the double-controlled slow-release multi-element coating compound fertilizer comprises the following steps:

[0020] Synthesis of low-formaldehyde urea-formaldehyde: Add urea and formaldehyde with a molar ratio of 1:0.8 into the reactor at one time, heat and stir, stop heating when the temperature rises to 25 °C, and adjust the pH value to 4.0-5.0 after the urea dissolves, and react After 10-20 min, the turbidity point appears, adjust the pH value to 5.0-6.0, react for a period of time, adjust the pH value to 7.0-8.0 with sodium hydroxide solution, cool down and discharge.

[0021] Preparation of urea-formaldehyde-oxidized starch-diatomite organic-inorganic composite slow-release material: select a ratio of 1:1.2 and mix to prepare urea-formaldehyde-oxidized starch binder, and then mix with diatomaceous earth in a mass ratio of 3:1 to prepare urea-formaldehyde-oxidized Starch-diatomaceous earth composite slow-release material. Its properties: ...

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Abstract

The invention discloses a preparation method of a double-control slow release multi-element coating composite fertilizer. The method comprises the following steps: by using a low formaldehyde urea formaldehyde-oxidized starch composite material as an adhesive, compounding with diatomite to form a slow release system; reasonably proportioning a slow release nitrogen fertilizer, a quick-acting nitrogen fertilizer, a phosphate fertilizer or a potassium fertilizer; and preparing the low formaldehyde urea formaldehyde-oxidized starch-diatomite-based slow release fertilizer by virtue of an integrated technique of extruding and mixing reaction, vibratory screening and disc granulation. The fertilizer which is applied to soil can be fully biodegraded and is environment-friendly, not only can satisfy the demand on granular production of the compound fertilizer, but also can control release of the compound fertilizer, so that the utilization ratio of the fertilizer is improved.

Description

technical field [0001] The invention belongs to the technical field of chemical fertilizer production, and in particular relates to a preparation method of double-controlled slow-release multi-element coated compound fertilizer. Background technique [0002] As we all know, my country is a large agricultural country, and the demand for fertilizers is quite huge. In addition to domestic production, a large amount of chemical fertilizers must be imported every year to meet the needs of the development of agriculture, forestry, fishery and animal husbandry. After chemical fertilizers are applied to the soil, there are three whereabouts, that is, absorption and utilization by plants, adsorption by soil, and loss (loss and gas volatilization). According to reports: Nitrogen fertilizer applied to the soil in the form of ammonium salt or ammonium amide, the absorption and utilization of rice is generally 11-35%, the soil adsorption is 13-44%, and the loss is 19-45%. For example, t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/00C05G3/08C05G3/04C05G3/80C05G3/90
Inventor 刘华涛岳广宇张秀军
Owner SINO AGRI SHUNTIAN ECOLOGICAL FERTILIZER CO LTD
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