Compound fertilizer containing various forms of nitrogen, and preparation method thereof

Abstract

The invention relates to a compound fertilizer containing various forms of nitrogen, and a preparation method thereof. According to the invention, the contained nitrogen comes from urea and a fertilizer containing nitrate nitrogen, the surfaces of the granular urea and the granular fertilizer containing nitrate nitrogen are coated with a layer of a separant containing medium trace elements under the action of a binder, a mixture containing a phosphate fertilizer and a potash fertilizer is wrapped with the binder, and a mass part ratio of the granular urea to the granular fertilizer containingnitrate nitrogen to the separant to the mixture of the phosphate fertilizer and the potash fertilizer is 100:(20-200):(15-55):(60-140); and the compound fertilizer containing various forms of nitrogencan provide urea nitrogen, nitrate nitrogen and other forms of nitrogen at the same time, is reasonable and diversified in nutrient form compatibility, meets the requirements of plants on different nutrition elements and forms, solves the technical problems that urea nitrogen and nitrate nitrogen cannot be mixed and coexist, the moisture absorption point is low and the process cannot be achievedin the compound fertilizer industry for a long time, and meets the agricultural requirements and the process requirements of industrial production.

Description

technical field [0001] The invention relates to a compound fertilizer and a production method thereof, in particular to a compound fertilizer containing various forms of nitrogen and medium nutrient elements and a production method thereof. Background technique [0002] Fertilizer is an indispensable means of production for agricultural production. The production and consumption of chemical fertilizers in my country rank first in the world, and the amount of fertilizer applied per unit area is nearly four times that of the world's average level. Excessive input of chemical fertilizers not only consumes a lot of resources, but also increases agricultural costs. It will also cause environmental pollution. [0003] With the process of agricultural modernization, agricultural fertilization has shifted from the use of simple fertilizers to compound fertilizers, and the products of compound fertilizers have also changed from general-purpose to crop-specific. Crop-specific compound...

AI Technical Summary

Problems solved by technology

Although this method can produce compound fertilizers containing three forms of nitrogen, it cannot fundamentally solve the direct contact between urea and ammonium nitrate raw materials (ammonium nitrate, phosphate nitrate), and the problem of strong hygroscopicity can be said to have not been well solved. the solution

[0006] Chinese patent document 201610044735.3 (publication number CN105503280A) discloses a production method of granular compound nitrogen fertilizer, fluidize ammonium nitrate fertilizer granules or ammonium nitrate phosphate fertilizer granules and preheat to 40-60°C, and liquid urea or urea melt Spray onto the preheated fertilizer granules, and wrap them on the fluidized fertilizer granules for granulation to produce a granular compound nitrogen fertilizer containing three forms of nitrogen, but the product of this technology is still a nitrogen fertilizer, suitable for only nitrogen fertilizers In some occasions (such as crop topdressing), and for most situations that require nitrogen, phosphorus and potassium nutrients, it is also necessary to apply phosphorus or potassium fertilizers. Compared with compound fertilizers, the fertilization process is more complicated, and the labor or mechanical input for fertilization is increased.