Device for producing powdery monoammonium phosphate by using extraction spent acid

Abstract

The invention discloses a device for producing powdery monoammonium phosphate by using extraction spent acid. The device comprises a wet purified phosphoric acid and extraction spent acid tank, a dilute phosphoric acid storage tank, an ammonification reactor, a slurry concentrator and a product spray drier, wherein an acid preparing tank is arranged before the ammonification reactor; the wet purified phosphoric acid and extraction spent acid tank is connected with the acid preparing tank through a pipeline, and a conveying pump and a gauge are arranged on the pipeline; the dilute phosphoric acid storage tank is connected with the acid preparing tank through a pipeline, and a conveying pump and a gauge are arranged on the pipeline; and the acid preparing tank, the ammonification reactor, the slurry concentrator and the product spray drier are sequentially connected with one another through pipelines. By the device, the moisture of a product in the production process can be effectively controlled, and the total nitrogen content of the product can be improved; and the device is stably and reliably operated.

Description

technical field [0001] The invention relates to a process device for purifying the by-product raffinate of wet-process phosphoric acid to produce powdery monoammonium phosphate. Background technique [0002] In the prior art, the purification process of wet-process phosphoric acid has undergone new developments in recent years. The quality of purified wet-process phosphoric acid is comparable to that produced by thermal process, and the production cost is relatively low. In the industrial field, there is an alternative to thermal phosphoric acid. trend. In the currently widely used liquid-liquid solvent extraction process to purify wet-process phosphoric acid, a by-product raffinate is produced, and F in raffinate - , SO 4 2- The content of such anions is reduced, but the metal cations in wet-process phosphoric acid are enriched; raffinate is generally used to make fertilizers, but when using raffinate to produce fertilizers, compared with ordinary wet-process phosphoric ...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the deficiencies of the prior art, the present invention aims to provide a device for producing powdered monoammonium phosphate by using raffinate acid, so as to solve the problems of difficult control of product moisture and insufficient total nitrogen content of the product.

Images