Mono-ammonium phosphate produced by using wet process phosphoric acid and production method of mono-ammonium phosphate

Abstract

The invention relates to the technical field of mono-ammonium phosphate prepared by using wet process phosphoric acid, and in particular to mono-ammonium phosphate produced by using wet process phosphoric acid and a production method of the mono-ammonium phosphate. When an ammonia gas is introduced or liquid ammonia is added into impurities in phosphoric acid prepared by using the wet process phosphoric acid, the neutralization in mixed liquor is adjusted to 0.5-0.8 to generate a large amount of precipitates from the impurities in the phosphoric acid, separation treatment is carried out by using a separator, after phosphoric acid with higher purity is obtained, the ammonia gas or the liquid ammonia is introduced in the phosphoric acid, and the pH value of the phosphoric acid is controlled to obtain mono-ammonium phosphate slurry with higher purity, so that the purity of a mono-ammonium phosphate product is improved and the total nutrient in the mono-ammonium phosphate is 60.15-60.36%, wherein counted by phosphorus pentoxide, the phosphorus content is 49.0-51.0%, the content of water soluble phosphorus is 47.62-48.15%, the nitrogen content is 9.0-11.0%, the fluorine content is 0.48-0.68%, the quality of the ammonium phosphate is improved, and the environmental pollution of the ammonium phosphate resulting from a fertilization effect is avoided.

Description

technical field [0001] The invention relates to the technical field of preparing monoammonium phosphate by wet-process phosphoric acid, in particular to monoammonium phosphate produced by wet-process phosphoric acid and a production method thereof. Background technique [0002] Monoammonium phosphate is a high-efficiency compound fertilizer except diammonium phosphate. Because of its high nutrient content, it is also widely used in various plant fertilization. With the continuous development of agricultural technology, people have a deeper understanding of the growth mechanism of plants, and the requirements for fertilizer efficiency and impurity content are getting higher and higher. At present, the requirement for water-soluble phosphorus in monoammonium phosphate is more than 90% of the total phosphorus, and the requirement for fluorine content is not higher than 1%. In the traditional process of producing monoammonium phosphate using wet-process phosphoric acid, wet-pro...

AI Technical Summary

Problems solved by technology

In the traditional process of producing monoammonium phosphate using wet-process phosphoric acid, wet-process phosphoric acid is used to directly react with ammonia, and the total nutrient is adjusted by controlling the molar ratio of ammonia to phosphoric acid, so that all impurities in wet-process phosphoric acid enter the product, resulting in The content of impurities such as total nutrients, water-soluble phosphorus and fluorine in the product is difficult to control and cannot meet market demand

[0003] Moreover, the fluorine content in monoammonium phosphate is high, which limits the scope of use of fertilizers. At the same time, due to the existence of various impurity elements, the effect of fertilization and the short-board theory of wooden barrels have an impact on crops. Obviously, the crop growth environment has been seriously polluted. For this reason, through long-term exploration and research, this researcher has provided a new option for the production of monoammonium phosphate products using wet-process phosphoric acid, reducing the production of monoammonium phosphate. Product production cost