Slow-release humic acid and urea compound fertilizer and preparation method thereof

Abstract

The invention discloses a slow-release humic acid and urea compound fertilizer and a preparation method thereof. The preparation method of the slow-release humic acid and urea compound fertilizer is characterized in that, water and a part of steam condensate, which are generated during reaction of humic acid and urea, are taken as a liquid phase and rolled into granules under the participation of a balling agent, wherein in the granulating process, the humic acid and the urea form balls through the balling agent and are tightly jointed together; when the granules grow to a certain grain diameter, the granules are thrown out under the action of a centrifugal force of a disc to enter a drying machine through a belt; the granules are dried till the moisture content is less than or equal to 2.5%, and the granules are sieved to obtain the granular fertilizer with the grain diameter of 2-4.75mm; and a layer of slow-release agent is coated on the surfaces of the granules to form secondary controlled release. By increasing or decreasing the use amount of a resin coating agent and the proportion of the humic acid, different slow-release humic acid and urea compound fertilizers with the grain diameters of 50-400 can be produced, so that the problems that the conventional nitrogen fertilizer resource has more constraints and the utilization ratio is relatively low are solved; the slow-release humic acid and urea compound fertilizer has the advantages of improving soil and improving the efficacy of the nitrogen fertilizer; and the preparation method is applicable to production of slow-release humic acid urea.

Description

Technical field: [0001] The invention specifically relates to a slow-release humic acid urea compound fertilizer and a preparation method thereof. The invention belongs to the technical field of chemical fertilizer production and is suitable for the production and application of slow-type humic acid urea. technical background: [0002] At present, in agricultural production, chemical fertilizers, especially traditional nitrogen fertilizers, have made important contributions, but there are still problems such as large resource constraints and low utilization rates. Slow and controlled-release fertilizers play an important role in improving nitrogen fertilizer use efficiency, and show many advantages such as reducing environmental pollution, reducing fertilization costs, and reducing fertilization labor, and are more and more popular in the market. Invention content: [0003] The purpose of the present invention is to provide a slow-release humic acid urea compound fertiliz...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problems of large resource constraints and low utilization rate of traditional nitrogen fertilizers, and provide a slow-release humic acid urea compound fertilizer that can improve soil and improve the efficacy of nitrogen fertilizers and its preparation method