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In order to use byproduct ammonium sulfate of thermoelec. devices, with the transformation, the ammonium sulfate is added to the diammonium phosphate device to adjust the product nutrient content.The process and specific tech. measures are mainly introduced, including selecting bag filter again, and adopting wet process to add ammonium sulfate.By adding ammonium sulfate to the diammonium phosphate production system, the nutrient content in DAP product is up to standard, and the cost is reduced, the economic benefits of 18.8794 million RMB Yuan can be generated per yr after transformation.

Huagong Sheji Tongxun

Prospects of new technology for purification of phosphoric acid in diammonium phosphate production process

Author: Liu, Sheng-lan

A review.Phosphate fertilizers are widely used in all types of chem. fertilizers, and diammonium phosphate is one of the main product forms of phosphate fertilizers.The production of diammonium phosphate requires the extraction of phosphoric acid from phosphate rock.My country is a big country in the production and consumption of phosphate rock.Since 2015, my country's phosphate rock import and export trade has been in surplus, and in 2020, the trade surplus has reached 36.7 million US dollars.The article introduces how to remove impurities in phosphoric acid prepared from phosphate rock during the production of diammonium phosphate, and how to reduce environmental pollution during the production of diammonium phosphate, especially the treatment of sulfur dioxide and sulfuric acid mist, as well as domestic application prospect of new technol. for purification of exophosphoric acid.

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