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
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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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