Neutralizing and concentrating device used for monoammonium phosphate production and using method thereof

Abstract

The invention discloses a neutralizing and concentrating device used for monoammonium phosphate production and a using method thereof. Specifically, the bottom of a reactor is connected with a steam heat exchanger through a circulating pump; the steam heat exchanger is connected with a tubular reactor; the tubular reactor is connected with the top of the reactor through a reaction slurry circulating tube; the upper part of the reactor is equipped with an extracted residual acid conveying tube; the middle part of the reactor is connected with a high-pressure pump through a high-pressure pump conveying tube, and the slurry is fed to a powder spraying tower. Extracted residual acid or concentrated phosphoric acid performs neutral reaction with gas ammonium, so that monoammonium phosphate which meets powder-spraying indexes is conveyed to the powder spraying tower through the high-pressure pump to obtain a monoammonium phosphate finished product. When a slurry method is used for producingmonoammonium phosphate from extracted residual acid, concentration of acid needs to be reduced for follow-up production as concentration of the extracted residual acid is too high, so that steam consumption amount of slurry concentration can be reduced while the monoammonium phosphate product is produced through the slurry method; and 43200 tons of steam is saved per year according to the extracted residual acid consumption amount, so that the annular saved steam amount reaches economic benefits of 7.78 millions of yuan.

Description

technical field [0001] The present invention relates to the recycling and utilization of phosphorus resources. Specifically, the raffinate acid produced in the wet-process phosphoric acid refining process is simply mixed with acid (after ensuring that the acid concentration is 40-44%, and the specific gravity is 1.4-1.5). The device reacts with gaseous ammonia to generate monoammonium phosphate slurry, and adjusts its own concentration system according to the actual situation of the slurry to obtain the required monoammonium phosphate slurry and send it to the powder spraying tower to produce monoammonium phosphate products. Background technique [0002] In the production process of wet-process phosphoric acid refining, a large amount of raffinate will be produced, which has high solid content and high sesquioxide. The general treatment method is to use the by-product raffinate to produce monoammonium phosphate by slurry method , because the acid concentration of the raffina...

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Problems solved by technology

[0004] The present invention aims to provide an integrated device for neutralizing and concentrating monoammonium phosphate products using raffinate acid to solve the problem of too high concentration of raffinate acid when using raffinate method to produce monoammonium phosphate products. , it is necessary to reduce the technical difficulties of subsequent production after acid concentration, which can save the steam consumption of slurry concentration in the production of monoammonium phosphate products by slurry method, and save a large amount of steam required for slurry concentration every year, and play a role in energy saving and emission reduction purpose, and at the same time realize the efficient recovery and reuse of raffinate

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