Study on hydrochloric acid fume purification process in cold rolling pickling unit
In view of the problems of high acid consumption and low recovery value of acid fume condensate in the current pickling process,the influence of exhaust pressure and Fem+concentration in the acid fume purification system on the concentration of hy-drochloric acid was studied through theoretical calculations and experiments.The results showed that the concentration of hydro-chloric acid solution obtained by the original 160 g/L hydrochloric acid solution under-60 kPa extraction pressure was 40.1 g/L,while the concentration of hydrochloric acid solution obtained by the same original 160 g/L hydrochloric acid under-5 kPa extraction pressure was only 10.9 g/L.In addition,the presence of Fem+in the acid solution does not change the HCl content in the acid fume.To this end,corresponding improvement measures have been proposed:(1)separate the high and low concentra-tion acid tanks for condensation,directly recycle the acid fume in the high concentration acid tank to the acid circulation system after condensation,and replace some of the rinsing waste water with condensed acid fume and transport it to the acid regeneration system for treatment.(2)improve the structure of the acid tank and exhaust system,reduce the amount of acid fume,and reuse some condensed hydrochloric acid solution to achieve acid fume reduction and green treatment.
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