Method for producing ammonium sulfate in S-NPK device by using refined phosphoric acid byproduct tail liquid

Abstract

The invention relates to a method for producing ammonium sulfate in an S-NPK device by using refined phosphoric acid byproduct tail liquid. The refined phosphoric acid byproduct tail liquid, concentrated sulfuric acid and diluted phosphoric acid are sufficiently mixed in a hydrogen potassium conversion tank, the mixed acid materials after being mixed enter a mixed acid storage tank and take reaction with gaseous ammonia in a tubular reactor, the obtained slurry then takes neutralization reaction with the concentrated sulfuric acid in a neutralization tank, and finally, finished ammonium sulfate products can be obtained through slurry spraying granulation, drying and sieving. The method has the advantages that the wet process phosphoric acid refined industrial phosphoric acid byproduct tail liquid, the concentrated sulfuric acid, the diluted phosphoric acid and the gaseous ammonia are directly used as raw materials, the recovery problem of the wet process phosphoric acid refined industrial phosphoric acid byproduct tail liquid is solved, the product manufacture cost is reduced, and the byproduct flow process during the phosphoric acid refining is reduced; and the S-NPK device is used for producing the ammonium sulfate, the investment cost is reduced, the device utilization rate is improved, and the economic benefits are good.

Description

technical field [0001] The invention relates to a process for producing compound fertilizers, in particular to a method for producing ammonium phosphate compound fertilizers in an S-NPK device by utilizing the by-product tail liquid of industrial phosphoric acid refined by wet-process phosphoric acid. Background technique [0002] At present, the ammonium phosphate market is in short supply, and its nutrient nitrogen, phosphorus, and sulfur contents can be controlled. Among them, the threshold value of available nitrogen can be adjusted between 12-20, the threshold value of available phosphorus can be adjusted between 20-26, and the threshold value of available sulfur can be adjusted. Threshold can be adjusted between 13-22. Ammonium phosphate is widely used in wheat, cotton, corn, sorghum, soybean, mung bean, sesame, rice and other crops, especially for anaerobic tobacco, potato, sweet potato, vegetables and other tubers and solanaceous plants. adaptability. The tradition...

AI Technical Summary

Problems solved by technology

The traditional production process of ammonium phosphate ammonium compound fertilizer is obtained by physical stirring and mixing of monoammonium phosphate and ammonium sulfate as raw materials, which is a physical method; with the development of the chemical fertilizer industry and technological innovation, many manufacturers are The existing DAP production device was simply modified and successfully used to produce ammonium sulfophosphate. It is a chemical synthesis method, but there are some technical difficulties in this process, such as adding a large amount of water into the system to ensure thermal stability and slurry solid content stability

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