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Preparation method of granular fertilizer with core-shell structure

A technology of granular fertilizer and core-shell structure, applied in the direction of inorganic fertilizers, calcium fertilizers, fertilizer mixtures, etc., can solve the problems such as the lack of detailed introduction of the preparation method of granular fertilizers, the difficulty in controlling the release of nutrient elements, and the difficulty in selecting organic carbon sources. Achieve the effects of non-toxic and harmless raw materials, good social and economic benefits, and simple and easy-to-operate methods

Inactive Publication Date: 2018-11-23
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] CN 108191473 A discloses a granular fertilizer and its preparation method. The granular fertilizer has a core-shell structure, the inner core contains organic fertilizer, and the shell is composed of organic carbon sources. The nitrogen content of the organic fertilizer is ≥ 2%, and the organic carbon The nitrogen in the inner core is firstly held by microorganisms, and then transformed externally for nitrogen supply, thereby realizing the regulation of nitrogen release. However, it is difficult to select a suitable organic carbon source. make a detailed introduction
CN103880550 A discloses a method for preparing slow-release chemical fertilizers by using hollow ceramic microsphere coating method. The method uses coal gangue hollow ceramic microspheres or fly ash hollow ceramic microspheres as raw materials, chemical fertilizers and binders, and the hollow ceramic microsphere The beads cover the fertilizer with a binder, and a multi-layer coating structure is obtained in the same way, but the hollow ceramic microbeads in the slow-release fertilizer are used as the coating, which has poor stability, and the release of nutrients in the fertilizer is not easy to control

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] The present embodiment provides a kind of preparation method of the granular fertilizer with core-shell structure, described method comprises the following steps:

[0055] (1) Add urea granules to the disc granulator, the particle diameter of the urea granules is 1 to 2mm, add calcium carbonate and calcium sulfate mixed powder with a mass ratio of 1:1 after starting the device, the urea granules The mass ratio of the mixed powder with calcium carbonate and calcium sulfate is 0.4:1, the disc rotation rate of the disc granulator is 30r / min, and the stirring process is performed until uniform spherical particles are formed;

[0056] (2) During the stirring process, spray the silica sol diluted with water on the spherical particles obtained in step (1), the mass concentration of the original silica sol is 30wt%, the mass ratio of silica sol to water used for dilution is 1:2, after 20min Finally, add ash ore powder to the spherical particles until excess ash ore powder appea...

Embodiment 2

[0059] The present embodiment provides a kind of preparation method of the granular fertilizer with core-shell structure, described method comprises the following steps:

[0060] (1) add diammonium phosphate granules in the drum granulator, the particle diameter of described diammonium phosphate granules is 7~8mm, add bauxite powder after starting device, the bauxite powder of described diammonium phosphate granules and bauxite powder The mass ratio is 3:1, the drum rotation rate of the drum granulator is 20r / min, and the stirring process is performed until uniform spherical particles are formed;

[0061] (2) During the stirring process, spray the silica sol diluted with water on the spherical particles obtained in step (1), the original silica sol mass concentration is 20wt%, the mass ratio of silica sol and diluted water is 1:6, after 10min Finally, add ash ore powder to the spherical particles, excess ash ore powder appears at the bottom of the drum, and then carry out dryi...

Embodiment 3

[0064] The present embodiment provides a kind of preparation method of the granular fertilizer with core-shell structure, described method comprises the following steps:

[0065] (1) Add the compound fertilizer 15-15-15 granule sold on the market in the disc granulator, the particle diameter of the compound fertilizer particle is 15~16mm, add cement powder after starting the device, the compound fertilizer particle The mass ratio to cement powder is 1:1, and the disc rotation rate of the disc granulator is 40r / min, stirring until uniform spherical particles are formed;

[0066] (2) During the stirring process, spray the silica sol diluted with water on the spherical particles obtained in step (1), the original silica sol mass concentration is 40wt%, the mass ratio of silica sol and diluted water is 1:10, after 30min Finally, add ash ore powder to the spherical particles, excess ash ore powder appears at the bottom of the disc, and then carry out drying treatment. The drying tr...

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Abstract

The invention provides a preparation method of a granular fertilizer with a core-shell structure. The preparation method comprises the following steps of adding the raw fertilizer particles into a granulating device, starting the granulating device, adding an inorganic powder, and stirring, so as to obtain the granular fertilizer with the core-shell structure. The inorganic powder layer is coatedto the surface of the raw fertilizer by the granulating device so as to obtain the granular fertilizer with the core-shell structure; the granular fertilizer has lasting-effect and slow-release functions, long use time and high utilization rate. The preparation method has the advantages that the preparation method is simple and is easy to operate; a large amount of product can be quickly prepared;the cost is lower; the raw materials are poisonless and harmless, and the green and environment-friendly effects are realized.

Description

technical field [0001] The invention belongs to the technical field of preparation of slow-release fertilizers, and relates to a method for preparing granular fertilizers with a core-shell structure. Background technique [0002] Increasing the production of food crops has always been the relentless pursuit of the agricultural field, especially with the rapid increase of the world population and the continuous reduction of arable land, the increase of agricultural production is even more urgent. At present, the main measure to increase the income of grain crops is the use of fertilizers. my country is a big producer of chemical fertilizers, and it is also a big country in the use of chemical fertilizers. The annual use of chemical fertilizers exceeds 70 million tons, but the utilization rate does not exceed 35%. More than 45 million tons of chemical fertilizers are not available. Playing its due effect will not only cause waste of resources, but also a large amount of chemica...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/00
CPCC05B7/00C05C9/00C05D9/00C05G3/00C05G5/30C05D3/00C05D3/02C05G1/00
Inventor 郑文婧惠建斌
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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