Preparation method of rounded grain potassium fertilizer

Abstract

The invention provides a preparation method of a rounded grain potassium fertilizer. The method comprises the following steps that powdery potassium fertilizers are poured into a stirrer to be stirred; atomized water is added by a high-pressure spray nozzle while the stirring is performed, so that the atomized water and the powdery potassium fertilizers are fully blended in the stirrer; then, ureais sprayed on the surface of a mixed material formed by the potassium fertilizer and the atomized water in a spraying form by the high-pressure spray nozzle; a second mixture is formed; next, the second mixture is heated to be 100 to 120 DEG C; the uniformly mixed third mixture is fed into a double-screw extruder; finally, the mixture is extruded through an opening mold; after mixing reaction, compacted materials are extruded through the opening mold via an airflow granulator and are directly cut into grain materials; after the grain cutting, the materials are fed into a planer for planing and roughening. The preparation method has the following beneficial effects that the obtained rounded grain potassium fertilizer has round, full and smooth grains and does not have a powder falling phenomenon; the fertilizer nutrients are not changed; the potassium fertilizer is suitable for mechanical fertilizer application and is matched with a mixed fertilizer to be used; high applicability is realized.

Description

technical field [0001] The invention relates to a method for preparing round potash fertilizer, which belongs to the technical field of fertilizer production. Background technique [0002] At present, formula fertilization has been popularized in rural areas. The main raw materials of formula fertilization are granular fertilizers containing nitrogen, phosphorus and potassium. Farmers can choose the proportion of nitrogen, phosphorus and potassium according to crop varieties and soil fertility, and mix them before sowing. The existing nitrogen fertilizer used for formula fertilizers is mainly large-grain urea, which is a very regular spherical particle. The phosphate fertilizer used for formula fertilizer is granular diammonium phosphate, and the diammonium phosphate particles are also very regular spherical particles. Potassium fertilizer used for formula fertilizer is generally irregular polyhedral particles produced by extrusion and phosphorus breaking method. After the t...

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Problems solved by technology

[0002] At present, formula fertilization has been popularized in rural areas. The main raw materials of formula fertilization are granular fertilizers containing nitrogen, phosphorus and potassium. Farmers can choose the proportion of nitrogen, phosphorus and potassium according to crop varieties and soil fertility, and mix them before sowing. The existing nitrogen fertilizer used for formula fertilizers is mainly large-grain urea, which is a very regular spherical particle. The phosphate fertilizer used for formula fertilizer is granular diammonium phosphate, and the diammonium phosphate particles are also very regular spherical particles. Potassium fertilizer used for formula fertilizer is generally irregular polyhedral particles produced by extrusion and phosphorus breaking method. After the three kinds of fertilizers are mixed together, because the shape of granular potassium fertilizer is different from that of nitrogen fertilizer and phosphorus fertilizer, there will be slight vibration during transportation or fertilization. It will be layered, and irregular potassium-containing particles will settle to the lower layer, resulting in uneven nutrients in the upper and lower layers of fertilizers, which will eventually affect fertilizer efficiency and crop yields.