Pyrite-to-sulfuric acid flue gas defluorination equipment and pyrite-to-sulfuric acid flue gas defluorination process method

Abstract

The invention relates to pyrite-to-sulfuric acid flue gas defluorination equipment, which comprises a reaction furnace, an efficient washing tower and a middle washing tower, wherein the efficient washing tower comprises a first defluorination material inlet, and the middle washing tower comprises a second defluorination material inlet formed in the side wall. According to the invention, a two-stage washing tower with defluorination gradient is arranged to treat so as to improve the defluorination efficiency, and different defluorination materials can be added to achieve efficient defluorination treatment; the equipment is small in occupied area and high in defluorination efficiency, and is suitable for transformation and upgrading of old factories; the process method of the pyrite-to-sulfuric acid flue gas defluorination equipment comprises the following steps: S1, introducing furnace gas into the efficient washing tower; S2, adding a first defluorination material into the efficient washing tower; S3, adding a second defluorination material into the middle washing tower; and S4, discharging the treated furnace gas; and the process method has the advantages of high defluorination efficiency and convenience in raw material obtaining of pyrite-to-sulfuric acid preparation plants, and is suitable for transformation and upgrading of old plants.

Description

technical field [0001] The invention relates to the technical field of flue gas defluorination, and more specifically, relates to a flue gas defluorination equipment and a process method of sulfuric acid produced from pyrite. Background technique [0002] Usually, most manufacturers of sulfuric acid produced from pyrite do not take into account that the fluorine content of the gas phase in the purification section will increase significantly due to the change of raw material fluorine content in the initial stage of design, resulting in severe corrosion, which makes it difficult to add washing devices or defluorination towers in the later stage. Moreover, because fluorine is difficult to remove during the roasting process, the prevention of fluorine hazards in the industry is also concentrated in the purification system. By increasing the amount of dilute acid discharge and using fluorine-resistant materials to remove and prevent fluorine, reduce the impact on purification equ...

AI Technical Summary

Problems solved by technology

Sulfuric acid plant has serious corrosion on dry suction facilities due to excessive fluoride in the gas phase, such as corrosion and perforation of dry suction pump, corrosion of first suction and second suction fiber demisters, resulting in reduced catalyst powdering activity, and even collapse of the ceramic ring of the drying tower; therefore, it must be purified The defluoridation treatment is carried out in the workshop section to ensure the normal operation of subsequent equipment

However, there is still a lack of a defluoridation equipment suitable for the improvement of old plants, with small footprint, high treatment efficiency, convenient maintenance and reasonable structure layout.

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