Process for preparing composite N-P-K fertilizer directly from urea solution

Abstract

A process for preparing granular composition N-P-K fertilizer directly from urea solution includes such steps as spraying the 65-99.7% urea solution at 80-140 deg.c onto base N-P-K fertilizer, granulating, drying, cooling and screening. Its advantages include simple process, low cost, high granule forminig rate and productivity, and high and stable quality.

Description

【Technical field】 [0001] The invention relates to a production method of nitrogen, phosphorus and potassium compound fertilizers, more precisely, relates to a method for directly producing compound fertilizers by mixing and granulating urea solution with basic fertilizers containing nitrogen, phosphorus and potassium. 【Background technique】 [0002] The existing technology for producing compound fertilizers is mainly based on the production of solid basic fertilizer ingredients, that is, the basic fertilizers containing nitrogen, phosphorus, and potassium, such as urea, ammonium phosphate, and potassium chloride, are respectively crushed, and then respectively metered and then fed into the mixer. The mixed material is sent to the drum granulator through the bucket elevator, and the material is rotated by the cylinder in the granulator to form a continuously rolling fluidized bed, and steam nozzles are buried in the rolling fluidized bed to flow to the granulator. The materia...

AI Technical Summary

Problems solved by technology

However, potassium salt and urea solution form a molten slurry, and the potassium salt needs to be heated to a certain temperature first, which not only increases equipment and energy consumption, but also complicates the production process.

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