Slow-release fertilizer containing sulfur, phosphorous and ammonium as well as preparation method of fertilizer

Abstract

The invention relates to the technical field of slow-release fertilizer, in particular to slow-release fertilizer containing sulfur, phosphorous and ammonium as well as a preparation method of the fertilizer. After sulfur powder or sulfur particles, a dispersant, a wetting agent, a thickening agent and the like are treated in water, powder with the particle fineness of the sulfur particles smaller than 0.075 mm is more than 98%, the suspension rate is higher than 92%, sulfur becomes a hydrophilic group, sulfur slurry is further emulsified, then the slurry coats surfaces of ammonium phosphate particles, the slow-release fertilizer containing sulfur, phosphorous and ammonium is obtained, nutritional ingredients of the slow-release fertilizer is guaranteed in combination of drying treatment, the amount of the sulfur on ammonium phosphate particles and the relative content of nitrogen and phosphorus in the ammonium phosphate particles and sulfur in slurry coated layers are guaranteed in combination of the manner that ammonium phosphate particles are coated during spraying, and the quality of the slow-release fertilizer is improved.

Description

technical field [0001] The invention relates to the technical field of slow-release fertilizers, in particular to a sulfur-containing ammonium phosphate slow-release 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 t...

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, which in turn cause the difficulty of uniform mixing and / or combination of sulfur and ammonium phosphate slurry, so that the quality of the prepared sulfur-containing ammonium phosphate fertilizer is low, the quality is poor, and even the sulfur-containing ammonium phosphate cannot be formed slow release fertilizer

[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