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Acid is regenerated and recovered from the spent acid in steel pickling plants. The spent acid containing chlorides of iron is oxidized in a fluidized bed reactor to produce iron oxide and HCl vapours. Whereas iron oxide is a useful bye-product, the HCl is absorbed in stoichiometric quantities of water to obtain 17 to 20% hydrochloric acid and reused for pickling. We design, manufacture and Supply special tray-type absorbers for the purpose. Finally, the gases are passed through packed columns to limit emissions within pollution control limits.
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