Method for producing chlorine-based high phosphorus compound fertilizer by ammoniation method

Abstract

The invention discloses a method for producing a chlorine-based high phosphorus compound fertilizer by an ammoniation method. The method is characterized by directly introducing gas ammonia to a material layer of a rotary drum granulator to increase the neutralization degree of monoammonium phosphate, granulating gas ammonia with other powdered fundamental fertilizers containing nitrogen, phosphorus and potassium and obtaining the compound fertilizer containing nitrogen, phosphorus and potassium through drying, cooling, screening and enveloping after granulation. The method has the following advantages: the heat producing reaction between the gas ammonia and double superphosphate and heat of neutralization generated by the reaction between the gas ammonia and the monoammonium phosphate are fully used of to maintain the temperature of the materials, and the solubility of ammonium phosphate salt is improved to satisfy the liquid phase quantity needed by granulation; the higher granulation rate can be ensured without adding other adhesives, thus lowering the input cost of the materials; and the moisture of the materials to be granulated is obviously reduced, thus reducing the drying load and saving plenty of energy.

Description

Technical field [0001] The invention relates to a high-phosphorus compound fertilizer production method, in particular to a method for preparing a ternary compound fertilizer containing nitrogen, phosphorus and potassium by adding chemical raw material ammonia into a granulation method production process. Background technique [0002] At present, with the development of modern agriculture, the development of compound fertilizers at home and abroad dominates the fertilizer industry. In developed countries in the fertilizer industry, the consumption of compound fertilizers has accounted for 70% to 80% of the fertilizer consumption. Compound fertilizer is mainly composed of basic fertilizers containing nitrogen, phosphorus, and potassium, such as urea, ammonium chloride, ammonium phosphate, potassium chloride, etc., after being mixed, in the granulator, at a certain temperature and liquid phase, Rely on its own adhesive force or add an appropriate amount of binder, agglomerate into ...

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Problems solved by technology

[0005] The above-mentioned granulation production technology is a production method widely used in my country. The production process of this method is simple and the operation is easy to master. However, there is no chemical reaction between the raw materials in the production process. Due to the high water content of the material, the subsequent drying load will be increased, and the particle strength of the product is low, the product strength is between 8N-12N, the particles are not smooth, and the color of the product is not good due to the influence of fillers.

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