Method for regulating nutrients in diammonium phosphate product

Abstract

The invention discloses a method for regulating nutrients in a diammonium phosphate product. Aiming at the characteristic that the danger coefficient for regulating the nutrient ratio in the diammonium phosphate product by adding concentrated sulfuric acid is high, ammonium sulphate slurry and ammonium sulfate crystal are produced through adding and dissolving phosphogypsum into diammonium phosphate slurry so as to embed ammonium sulfate into the diammonium phosphate product, thus the stable product quality is maintained, the consumption of a phosphorus resource is reduced, the nitrogen content of the diammonium phosphate product is increased and the production cost is lowered. The ammonium sulfate (NH4) 2SO4 has the nitrogen content of 21%; after the ammonium sulfate is added into the diammonium phosphate product, components of the diammonium phosphate product can be changed and the ammonia content of the diammonium phosphate product can be increased; by the method, not only phosphorus reduction and nitrogen increase of the diammonium phosphate product can be effectively promoted to keep stable product quality; the used ammonium sulfate slurry is produced by a device for producing ammonium dihydrogen phosphate from the phosphogypsum, so that high consumption of the phosphogypsum can save the treatment cost of the phosphogypsum, reduce the environment-protecting pressure and prolong the service life of a phosphogypsum slag field.

Description

technical field [0001] The invention relates to diammonium phosphate, in particular to a method for adjusting product nutrients in the production process of diammonium phosphate. technical background [0002] Diammonium phosphate is a water-soluble high-efficiency compound fertilizer containing nitrogen and phosphorus. Its production mainly adopts traditional method or slurry method. The traditional process uses wet-process concentrated phosphoric acid and high-purity liquid ammonia with a concentration of 45% to 48% as raw materials, and uses pre-neutralization and tubular reactors to prepare ammonium phosphate slurry, which is then coated in a drum ammoniation granulator. Granulated. [0003] The main quality evaluation index of diammonium phosphate products includes available phosphorus (P 2 o 5 ), total nitrogen content, water solubility, etc. The nutrient (nitrogen, phosphorus, potassium) of the traditional granular diammonium phosphate premium product i...

AI Technical Summary

Problems solved by technology

Phosphate rock resources are one of the most important resources for the production of phosphate compound fertilizers. When the product available phosphorus (P 2 o 5 ) content is too high, the production cost of diammonium phosphate will be greatly increased, and the product nutrition will deviate from the ratio of 18:46:0

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