Sulfur-containing slow-release compound fertilizer and preparation method thereof

Abstract

The invention relates to the technical field of slow release fertilizers, in particular to a sulfur-containing slow-release compound fertilizer and a preparation method thereof. A sulfur-containing ammonium phosphate mixed and coated slow-release fertilizer is designed to comprise a core layer and a coating layer, the coating layer is subjected to spraying coating treatment through sulfur coating slurry, the raw material ratio of the core layer and the granularity are combined for limitation, the thickness relation between the coating layer and the core layer is combined, accordingly, the prepared sulfur-containing ammonium phosphate mixed and coated fertilizer has a better slow release effect, agglomeration and caking phenomena caused due to the action of the slow-release fertilizer and water in the air are prevented, the quality of the slow-release fertilizer is improved, and the guarantee period is prolonged.

Description

technical field [0001] The invention relates to the technical field of slow-release fertilizers, in particular to a sulfur-containing slow-release compound fertilizer and a preparation method thereof. Background technique [0002] For a long time, due to the extensive use of sulfur-free high-concentration compound fertilizers and the substantial reduction in the content of humic acid as a sulfur source in the soil, coupled with the serious imbalance in the application ratio of nitrogen, phosphorus, and potassium, and the application of almost zero trace elements, making The fertilizer efficiency of the soil is not as good as it used to be, which in turn has become a restrictive factor for high crop yields. Therefore, sulfur-containing compound fertilizers, especially sulfur-containing ammonium phosphate fertilizers, have been favored by the market. [0003] At present, the sulfur sources in sulfur-containing ammonium phosphate fertilizers are mainly divided into two types: ...

AI Technical Summary

Problems solved by technology

However, most of them use sulfur trioxide as the sulfur source, which leads to limited absorption by crops, and its action time in the soil is short; a small part of the sulfur source of ammonium sulfophosphate fertilizer is sulfur, but because sulfur is incompatible with water And most of the organic solvents, and then it is difficult to uniformly mix and / or combine sulfur and ammonium phosphate slurry, so that the quality of the prepared sulfur-containing ammonium phosphate fertilizer is low, the quality is poor, and the nutrients are less, and even cause The surface of the slow-release fertilizer is easy to interact with the moisture in the air, which will cause agglomeration and agglomeration

[0004] At the same time, sulfur is a flammable and explosive substance, which may burn in the environment of heating and friction, and even cause explosion due to the continuous accumulation of sulfur dust in the air, which will cause greater danger in the production process; and , in the prior art, due to the inaccurate control of sulfur treatment methods, particle size, and dispersion in the production process of sulfur-containing ammonium phosphate slow-release fertilizers, the amount of sulfur on the surface of ammonium phosphate is insufficient, affecting The quality of the sulfur-containing ammonium phosphate slow-release fertilizer, and it will also lead to the phenomenon of agglomeration and agglomeration, resulting in the defect of reducing the quality of the sulfur-containing ammonium phosphate slow-release fertilizer