Abstract: A metal-organic framework material fertilizer and a preparation method therefor is provided. The novel fertilizer consists of nutrient molecules and external frameworks thereof, and is characterized in that the external frameworks are formed by coordination of inorganic metal ion clusters to organic joints under hydrothermal conditions. The metal-organic framework materials include two types, i.e., zinc-free and zinc-containing. The hydrothermal synthesis conditions of the novel metal-organic framework material fertilizer are that: the reaction temperature is 100° C., the reaction time is 24 h, the heating rate of the reactor is 2° C./min, and the speed of the stir bar is 120 revolutions per minute. The nutrient contents of the novel fertilizer are as follows: compound I: N: 4-5%, and P: 16-20%; and compound II: N: 5-7%, P: 15-18%, and Zn: 2-3%.

Abstract: Disclosed is a method for making a controlled release fertilizer with water-based coating using a closed large numerically controlled fluidized bed and a device therefor: collecting a granular fertilizer with a suitable granule size into a barrel; sucking the same into a coating cavity by negative pressure and making the same fluid; directing a water-based coating liquid into a spray gun, then spraying the liquid onto the surface of the fertilizer granules after nebulization; collecting the impurities in the air discharged from the coating cavity by means of a cyclone separator; dehumidifying the air discharged from the cyclone separator by means of a fluidized drying tower; and then the coating is completed.

Abstract: Disclosed is a method for making a controlled release fertilizer with water-based coating using a closed large numerically controlled fluidized bed and a device therefor: collecting a granular fertilizer with a suitable granule size into a barrel; sucking the same into a coating cavity by negative pressure and making the same fluid; directing a water-based coating liquid into a spray gun, then spraying the liquid onto the surface of the fertilizer granules after nebulization; collecting the impurities in the air discharged from the coating cavity by means of a cyclone separator; dehumidifying the air discharged from the cyclone separator by means of a fluidized drying tower; and then the coating is completed.