Method for producing high-nutrient monoammonium phosphate by dual-tube reverse process

Abstract

The invention discloses a method for producing high-nutrient monoammonium phosphate by a dual-tube reverse process. The method adopts wet-process phosphoric acid and liquid ammonia as raw materials and performs fast replacement on diammonium phosphate and produces chemical fertilizer-level high-nutrient monoammonium phosphate, and comprises the following steps of: production preparation: reducing solid content in strong phosphoric acid; earlier stage of production: keeping the equipment running in a low-load state, and performing single-tube revertive control to gradually transit to a monoammonium phosphate production process; and production process: entering a stable control stage of the production process, producing with a dual-tube reverse process, and adding certain amount of secondary ammonia supplement into a material bed of a granulator as necessary. By adopting the method disclosed by the invention, the total nutrient of the monoammonium phosphate product reaches 63%, the equipment runs stably, the yield can reach 45-70t / h, the contents of ammonia, phosphorus and potassium in the product are 11, 52 and 0 respectively, the water content is low, and a few impurities are contained; and the product is a water-soluble binary quick-acting compound fertilizer, is widely applied to agricultural production and can be used as a main raw material for preparing a nitrogen-phosphorus-potassium ternary compound fertilizer.

Description

technical field [0001] The invention relates to ammonium phosphate, in particular to a method for producing high-nutrient monoammonium phosphate by adopting a double-tube reverse process. technical background [0002] At present, the domestic ammonium phosphate product market is seriously saturated. Improving product quality and realizing product breakthroughs and innovations are important ways to enhance the competitiveness of enterprises. Promoting product diversification to meet the needs of different customers is an important way for enterprises to gain a foothold in the market in the fierce market competition. , An important guarantee for enhancing the enterprise's ability to resist risks. The rapid switching and stable production of the monoammonium phosphate process on the diammonium phosphate plant, especially the mass production of high-nutrient monoammonium phosphate, is an in-depth exploration of the functional diversification of the production plant. [0003] Af...

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Problems solved by technology

[0003] After retrieval, there is no relevant method for the production of high-nutrient monoammonium phosphate by using wet-process phosphoric acid in a diammonium phosphate device and using a double-pipe reverse process in the Chinese patent database.

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