Full water-soluble urea-based composite fertilizer and preparation method thereof

Abstract

The present invention discloses a full water-soluble urea-based composite fertilizer and a preparation method thereof. The full water-soluble urea-based composite fertilizer is prepared by mixing the following raw materials, wherein the raw materials comprise: urea, a fluxing agent, industrial ammonium dihydrogen phosphate (or potassium dihydrogen phosphate), potassium sulfate, a medium and traceelement additive, the weight ratio of the urea to the industrial ammonium dihydrogen phosphate to the potasium fertilizer to the EDTA complex to the borax is 1.0:0.25-0.90:0.3-1.1:0.02-0.3:0.02-0.10,or the weight ratio of the urea to the potassium dihydrogen phosphate to the potasium fertilizer to the EDTA complex to the fluxing agent is 1.0:0.2-1.1:0.1-1.1:0.02-0.60:0.02-0.10. The preparation method mainly comprises pulping, pelletizing, cooling and film wrapping, wherein the pulping treatment adopts the step-by-step melting and mixing method to carry out pulping, the pelletizing treatment adopts the differential rotations of the two shafts to carry out pelletizing, the cooling treatment comprises high tower primary natural air cooling and secondary rotating drum air cooling, finally the film wrapping treatment is performed to obtain the product, the isolation film is wrapped on the surfaces of the fertilizer particles so as to prevent the fertilizer particles from conglutination and agglomeration. The composite fertilizer of the present invention can be used for spraying application and drip irrigation application.

Description

technical field

[0001] The invention relates to a fully water-soluble urea-based compound fertilizer and a preparation method thereof. Background technique

[0002] High-tower granulation production of compound fertilizer first originated in Norway in the 1960s, my country began (in) the beginning of this century, and flourished after 2008. Because of its low moisture content, it is not easy to agglomerate, and the surface of the granules is smooth and has small holes, which has won the favor of farmers. Most of the prior art production of high-tower compound fertilizers uses water-insoluble fillers, such as Chinese patent 200410077770.2, which discloses the use of water-insoluble additive quartz powder in the compound fertilizer pulping process to reduce the surface tension and viscosity of the slurry and improve the slurry. Pulp fluidity. As Chinese patent 03139601.1, it is disclosed that urea-based compound fertilizer is made by urea, nitrogenous fertilizer, phosphate f...

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