Sulfur-encapsulated controlled-release potassium fertilizer and manufacturing method thereof

Abstract

The invention provides a sulfur-coated controlled-release potassium fertilizer and a manufacturing method thereof. The sulfur-coated controlled-release potassium fertilizer comprises potassium fertilizer granules, wherein the surface of each of the potassium fertilizer granules is sequentially coated with sulfur and a wax mask from inside to outside. The sulfur-coated controlled-release potassium fertilizer comprises the following components in parts by weight: 80-90 parts of potassium fertilizer granules, 8-17 parts of sulfur and 1-3 parts of wax composition. The sulfur-coated controlled-release potassium fertilizer is not limited by the shape of a coating raw material; and the used coating material is environment-friendly and excellent in controlled release property. The invention also discloses a preparation method of the sulfur-coated controlled-release potassium fertilizer, which comprises the following steps: (1) preheating potassium fertilizer granules to 60-90 DEG C, and coating with molten sulfur; and (2) coating the surfaces of the granules obtained in the step (1) with a molten wax composition, and cooling to obtain the sulfur-coated controlled-release potassium fertilizer. The preparation method is simple, easy to implement and convenient to realize industrial production.

Description

Technical field [0001] The invention relates to potash fertilizer technology, in particular to a sulfur-encapsulated controlled-release potash fertilizer and a manufacturing method thereof. Background technique [0002] Potash fertilizer is one of the three elements of fertilizer, which plays an important role in crop growth, yield and quality. my country needs nearly 10 million tons of potash fertilizer every year, and potash fertilizer is about 30% self-sufficient. Potash fertilizer is an important national strategic material. At present, potash fertilizer has a single form, mainly in granular and powder form. Granular and powdered potassium fertilizers are easy to lose, especially in sandy soil and rainy areas. At the same time, due to unreasonable fertilization, the current average utilization rate of potassium fertilizer is only 40%, which not only wastes resources, but also causes serious environmental pollution and crop yields. And the variety declined. [0003] The produ...

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to propose a sulfur-coated controlled-release potassium fertilizer, which is free from coated sulfur-coated controlled-release potassium fertilizers, for the above-mentioned existing controlled-release potash fertilizers that have high requirements for core raw materials, high cost of coated raw materials, and complicated preparation methods. The shape of raw materials is limited; the selected coating material is environmentally friendly and has excellent controlled release performance; the preparation method is simple and convenient for industrial production