Method and device for regulating nutrients of diammonium phosphate

Abstract

The invention discloses a method for regulating nutrients of diammonium phosphate. The method comprises the steps of pumping sulfuric acid into a tubular reactor through a sulfuric acid pump, enabling the sulfuric acid to be mixed with phosphoric acid and ammonia for reacting, and spraying a reaction product on a granulating material through a reverse nozzle of the same pipe for coating and granulating to obtain the diammonium phosphate, wherein the diammonium phosphate contains the following components in percentage by mass: 46% of phosphorus and over 18% of nitrogen. By using the method, the nitrogen content of a diammonium phosphate product can be effectively increased, and the phosphorus content of the diammonium phosphate product can be reduced; the corrosion of a cleaning system to equipment can also be relieved, so that the production cost is greatly reduced; the method is very suitable for diammonium phosphate production enterprises.

Description

technical field [0001] The invention relates to phosphate fertilizers, in particular to the production of diammonium phosphate and phosphorus compound fertilizers. Background technique [0002] Products produced by the traditional diammonium phosphate production process are determined according to national standards, and the available phosphorus (P 2 o 5 ) mass fraction ≥ 46%, nitrogen (N) content ≥ 17%. However, the phosphoric acid used as raw material obtained through concentration of wet-process phosphoric acid is affected by solid content, double oxides, etc., and the phosphorus content in the produced diammonium phosphate product is higher than 46%, which does not meet the standards of foreign markets. With the traditional production process, the product diammonium phosphate is affected by impurities, the P content is higher than 46%, and the N content is difficult to reach more than 18%. [0003] As a compound fertilizer, diammonium phosphate involves many technic...

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Problems solved by technology

However, the phosphoric acid used as raw material obtained through the concentration of wet-process phosphoric acid is affected by solid content, compound oxides, etc., and the phosphorus content in the produced diammonium phosphate product is higher than 46%, which does not meet the standards of foreign markets.

With the traditional production process, due to the influence of impurities, the P content of the product diammonium phosphate is higher than 46%, and the N content is difficult to reach more than 18%.

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