Fluorine absorption system used for wet-process phosphoric acid

Abstract

The invention provides a fluorine absorption system used for wet-process phosphoric acid. The system comprises a Venturi scrubbing device, a primary washing device, a pipe washing device, a secondarywashing device and a tertiary washing device which are arranged in sequence. According to the fluorine absorption system used for the wet-process phosphoric acid, waste gas containing fluorine passesthrough the Venturi scrubbing device, the primary washing device, the pipe washing device, the secondary washing device and the tertiary washing device in sequence for multi-stage washing, the washingdevices are provided with circulating tanks respectively, circulating fluid in the Venturi circulating tank and the primary washing tower circulating tank is continuously pumped out to enter a firstplate-and-frame filter press and a second plate-and-frame filter press, silica gel precipitation in the fluorine absorption system is removed, and the blocking frequency is reduced. The recycled watersupplement path is changed, the temperature of exhaust and the concentration of the circulating fluid are reduced, and therefore, the fluosilicic acid absorbing efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of purification equipment, in particular to a fluorine absorption system for wet-process phosphoric acid. Background technique [0002] There are two types of phosphoric acid production in industry: wet process phosphoric acid and thermal process phosphoric acid. Wet-process phosphoric acid is mainly produced by extraction reaction of strong acid (mainly sulfuric acid, a few processes use hydrochloric acid, nitric acid) and phosphate rock, and then filtered. Thermal process phosphoric acid is produced by oxidation and hydration of yellow phosphorus as raw material. , the phosphoric acid produced by the thermal process has a high purity, but consumes a lot of energy. It is mainly used as a raw material for the production of high-value-added and high-purity products. The wet-process phosphoric acid has a certain amount of impurities, and the cost is relatively cheap. It is mainly used for the production of pho...

AI Technical Summary

Problems solved by technology

From the point of view of the washing mechanism, if there is enough water, there is no problem in washing the tail gas up to the standard, but it is precisely the water balance limitation, so it is necessary to improve the washing efficiency from multiple angles and means, and ensure that the tail gas meets the standard under limited conditions emissions while extending the operating cycle as much as possible

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