Phoenix Systems, Inc.
                                        Leaders in Hydrochloric & Sulfuric Acid Recovery

Sulfuric Acid Recovery

v    Returns clean acid back to pickling tanks for reuse.

v    Maintains consistent high quality pickling liquor.

v    Reduces pickling immersion times.

v    Increases plant throughput and production.

v    Produces a ferrous sulfate hepta-hydrate crystal commonly used in the animal feedstock and waste-water municipality industries.

Process Overview

Like other Sulfuric Acid Recovery systems available, our systems utilizes freeze crystallization as a means of removing iron from the pickle liquor and returning clean acid to the pickle baths.  Systems are available in both batch and continuous forms.

The process of extracting the iron from the pickling liquor is simple.  Spent liquor enters the system and passes through a series of Teflon impregnated heat exchangers cooling the liquor to 55 degrees Fahrenheit.  As the temperature approaches 55 degrees F, ferrous sulfate hepta-hydrate crystals begin to form.  The cooled acid then enters a specially designed conical tank where the iron crystals, formed in the cooling stage, precipitate and settle to the bottom of the tank.  As the iron precipitates out of the solution, the remaining clean acid is returned to the pickling tanks for reuse. 

Once the crystals have begun settling in the conical tank, they are pumped from the bottom of the tank into a centrifuge that separates the remaining acid from the crystal slurry.  From there a dry ferrous sulfate hepta-hydrate crystal falls from the centrifuge into a receptacle.   

Flow Diagram

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